#vein__vena  a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary carry unaerated blood
  supertype:  blood_vessel__bloodvessel  a vessel in which blood circulates
  part of:  circulatory_system
  subtype:  accessory_cephalic_vein__vena_cephalica_accessoria  a vein that passes along the radial edge of the forearm and joins the cephalic vein near the elbow
  subtype:  accessory_hemiazygos_vein__accessory_hemiazygous_vein__accessoryhemiazygousvein__vena_hemiazygos_accessoria  a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein
  subtype:  accessory_vertebral_vein__accessoryvertebralvein__vena_vertebralis_accessoria  a vein that accompanies the vertebral vein but passes through the foramen of the transverse process of the 7th cervical vertebra and empties into the brachiocephalic vein
  subtype:  accompanying_vein__vena_comitans  a vein accompanying another structure; a vein may accompany an artery in such a way that the arterial pulses aid venous return
  subtype:  anastomotic_vein__anastomoticvein__venaanastomotica  either of two communicating veins serving the brain
  subtype:  angular_vein__angularvein__venaangulari  a short vein formed by the supraorbital vein and the supratrochlear vein and continuing as the facial vein
  subtype:  anterior_vertebral_vein__vena_vertebralis_anterior  a vein that accompanies the ascending cervical artery and opens into the vertebral vein
  subtype:  appendicular_vein__vena_appendicularis  a vein that accompanies the appendicular artery and empties into the ileocolic vein
  subtype:  arcuate_vein_of_the_kidney__vena_arcuata_renis  veins that receive blood from interlobular veins of kidney and rectal venules
  subtype:  auricular_vein__auricularvein__vena_auricularis  one of two veins serving the ear region
  subtype:  axillary_vein__vena_axillaris  a continuation of the basilic vein and brachial vein that becomes the subclavian vein
  subtype:  azygos_vein__azygous_vein__azygousvein__vena_azygos  one of a system of veins that drain the thoracic and abdominal walls; arises as a continuation of the right ascending lumbar vein and terminates in the superior vena cava
  subtype:  basal_vein__basalvein__vena_basalis  a large vein passing along the medial surface of the temporal lobe and emptying into the great cerebral vein
  subtype:  basilic_vein__basilicvein__vena_basilica  a vein that drains the back of the hand and forearm and empties into the axillary vein
  subtype:  basivertebral_vein__basivertebralvein__vena_basivertebralis  one of a number of veins draining the spongy substance of the vertebrae and emptying into the anterior internal vertebral venous plexus
  subtype:  brachial_vein__vena_brachialis  two veins in either arm that accompany the brachial artery and empty into the axillary vein
  subtype:  brachiocephalic_vein__brachiocephalicvein__innominate_vein__vena_brachiocephalica  veins formed by the union of the internal jugular and subclavian veins
  subtype:  bronchial_vein__bronchialvein__vena_bronchialis  veins serving the bronchi; empty into the azygos vein
  subtype:  cardinal_vein  any of the major venous channels in primitive adult vertebrates and in embryos of higher vertebrates
     subtype:  anterior_cardinal_vein  a major drainage channel from the cephalic part of the body
     subtype:  posterior_cardinal_vein  a major drainage channel from the caudal part of the body
     subtype:  common_cardinal_vein  the major return channels to the heart; formed by anastomosis of the anterior and posterior cardinal veins
  subtype:  central_veins_of_liver__venae_centrales_hepatis__venaecentraleshepati  terminal branches of the hepatic veins that lie in the hepatic lobules and receive blood from the liver sinusoids
  subtype:  central_vein_of_retina__vena_centrales_retinae  vein formed by the union of the retinal veins; accompanies central arteries of the retina in the optic nerve
  subtype:  central_vein_of_suprarenal_gland__vena_centralis_glandulae_suprarenalis  a single draining vein; on the right it empties into the inferior vena cava; on the left it empties into the left renal vein
  subtype:  cephalic_vein__vena_cephalica  a large vein of the arm that empties into the axillary vein
  subtype:  cerebellar_vein__vena_cerebellum  the veins draining the cerebellum
  subtype:  cerebral_vein__vena_cerebri  any of several veins serving the cerebral hemispheres of the brain
     subtype:  anterior_cerebral_vein__vena_cerebri_anterior  accompanies the anterior cerebral artery and empties into the basal vein
     subtype:  great_cerebral_vein__vena_cerebri_magna  a cerebral vein formed by the two internal cerebral veins and continuing into the sinus rectus
     subtype:  inferior_cerebral_vein__venae_cerebrum_inferior  veins that drain the undersurface of the cerebral hemispheres and empty into the cavernous and transverse sinuses
     subtype:  internal_cerebral_vein__vena_cerebrum_internus  two paired veins passing caudally near the midline and uniting to form the great cerebral vein
     subtype:  middle_cerebral_vein__vena_cerebri_media  either of two cerebral veins
        subtype:  deep_middle_cerebral_vein  accompanies the middle cerebral artery deep in the Sylvian fissure; empties into the basal vein
        subtype:  superficial_middle_cerebral_vein  a large vein along the line of the Sylvian fissure to the cavernous sinus
     subtype:  superior_cerebral_vein__vena_cerebrum_superior  a cerebral vein that drains the dorsal convexity of the cerebral hemisphere and empties into the cavernous sinus
  subtype:  deep_cervical_vein__cervical_vein__vena_cervicalis_profunda  a vein that accompanies an artery of the same name
  subtype:  choroid_vein__choroidvein__vena_choroidea  either of two veins serving the choroid coat of the eye
  subtype:  ciliary_veins__ciliaryvein__venae_ciliares  small veins coming from the ciliary body
  subtype:  circumflex_vein__vena_circumflexa  any of several curved parallel veins accompanying arteries of the same name
     subtype:  circumflex_iliac_vein__vena_circumflexa_ilium  accompanies the artery of the same name
     subtype:  circumflex_femoral_vein__vena_circumflexus_femoris__venacircumflexusfemori  either of two veins that accompany arteries of the same name serving the hip and thigh
  subtype:  clitoral_vein__vena_clitoridis  veins that serve the clitoris
     subtype:  venae_profundae_clitoridis  deep veins of the clitoris; join the vesical plexus
     subtype:  vena_dorsalis_clitoridis_profunda  deep dorsal vein of the clitoris; tributary of the vesical venous plexus
     subtype:  venae_dorsales_clitoridis_superficiales  superficial dorsal veins of the clitoris; tributaries of the external pudendal vein on either side
  subtype:  colic_vein__colicvein__vena_colica  vein serving the large intestine
  subtype:  common_facial_vein  vein formed by union of facial vein and the retromandibular vein and emptying into the jugular vein
  subtype:  conjunctival_veins__venae_conjunctivales  veins draining the conjunctiva
  subtype:  costoaxillary_vein__costoaxillaryvein  one of several veins connecting intercostal veins with with the lateral thoracic vein or the thoracoepigastric vein
  subtype:  cutaneous_vein__cutaneousvein__vena_cutanea  one of a number of veins in the subcutaneous tissue that empty into deep veins
  subtype:  cystic_vein__vena_cystica  vein that drains the gallbladder
  subtype:  digital_vein__digitalvein__vena_digitalis  one of the veins serving the fingers or toes
  subtype:  diploic_vein__diploicvein__venadiploica  one of the veins serving the spongy part of the cranial bones
  subtype:  dorsal_scapular_vein__vena_scapularis_dorsalis  vein that is a tributary of the subclavian vein or external jugular vein and accompanies the descending scapular artery
  subtype:  emissary_vein__vena_emissaria  one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull
  subtype:  epigastric_vein  veins serving the anterior walls of the abdomen
     subtype:  inferior_epigastric_vein__vena_epigastrica_inferior  empties into the external iliac vein
     subtype:  superficial_epigastric_vein__vena_epigastrica_superficialis  empties into the great saphenous vein
     subtype:  superior_epigastric_veins__venae_epigastricae_superiores  veins that accompany the superior epigastric artery
  subtype:  esophageal_veins__oesophageal_veins__oesophagealvein__venae_esophageae__venaeesophageae  small veins from the esophagus emptying into the brachiocephalic vein or the azygos veins
  subtype:  ethmoidal_vein__ethmoidalvein__vena_ethmoidalis  veins that drain the ethmoidal sinuses and empty into the superior ophthalmic vein
  subtype:  external_nasal_vein__vena_nasalis_externa  one of the veins that drain the external nose and empty into the angular or facial vein
  subtype:  facial_vein__vena_facialis  any of several veins draining the face
     subtype:  anterior_facial_vein__vena_facialis_anterior  a continuation of the angular vein; unites with the retromandibular vein before emptying into the internal jugular vein
     subtype:  retromandibular_vein__retromandibularvein__vena_retromandibularis__posterior_facial_vein  posterior branch of the facial vein; formed by temporal veins in front of the ear
  subtype:  femoral_vein__femoralvein__vena_femoralis  a vein that accompanies the femoral artery in the same sheath; a continuation of the popliteal vein; becomes the external iliac vein
  subtype:  gastric_vein__gastricvein__vena_gastrica  one of several veins draining the stomach walls
     subtype:  left_gastric_vein__vena_gastrica_sinistra  arises from a union of veins from the gastric cardia; runs in the lesser omentum; empties into the portal vein
     subtype:  pyloric_vein__pyloricvein__right_gastric_vein__rightgastricvein__vena_gastrica-dextra  receives veins from the upper surfaces of the stomach and empties into the portal vein
  subtype:  gastroomental_vein__gastroomentalvein__gastroepiploic_vein__vena_gastroomentalis  one of two veins serving the great curvature of the stomach
  subtype:  genicular_vein__genicularvein__vena_genus  veins that drain blood from structures around the knee; empty into the popliteal vein
  subtype:  gluteal_vein__glutealvein__vena_gluteus  veins draining the gluteal muscles on either side of the body
  subtype:  hemizygos_vein__hemizygosvein__hemizygous_vein__vena_hemizygos  a continuation of the left ascending lumbar vein; crosses the midline at the 8th vertebra and empties into the azygos vein
  subtype:  hemorrhoidal_vein__rectal_vein__vena_rectalis  any of several veins draining the walls of the anal canal and rectum
  subtype:  hepatic_vein__hepaticvein__vena_hepatica  a vein that drains the liver; empties into the vena cava
  subtype:  ileocolic_vein__ileocolicvein__vena_ileocolica  a vein that drains the end of the ileum and the appendix and the cecum and the lower part of the ascending colon
  subtype:  iliac_vein__iliacvein__vena_iliaca  one of three veins draining the pelvic area
     subtype:  hypogastric_vein__hypogastricvein__internal_iliac_vein  a vein that unites with the external iliac vein to form the common iliac vein
     subtype:  external_iliac_vein  a continuation of the femoral vein; unites with the internal iliac vein to form the common iliac vein
     subtype:  common_iliac_vein  formed by the internal and external iliac veins; unites with its fellow from the opposite side of the body to form the inferior vena cava
  subtype:  iliolumbar_vein__vena_iliolumbalis  a branch of the internal iliac vein
  subtype:  intercapitular_vein__vena_intercapitalis  veins connecting the dorsal and palmar veins of the hand or the dorsal and plantar veins of the foot
  subtype:  intercostal_vein__intercostalvein__vena_intercostalis  several veins draining the intercostal spaces of the rib cage
  subtype:  intervertebral_vein__vena_intervertebralis  one of several veins accompanying spinal nerves
  subtype:  jugular_vein__jugularvein__vena_jugularis__jugular  veins in the neck that return blood from the head
     subtype:  anterior_jugular_vein  arises below the chin from veins draining the lower face; joins the external jugular vein
     subtype:  external_jugular_vein  formed by the junction of the posterior auricular and the retromandibular veins; empties into the subclavian vein
     subtype:  internal_jugular_vein  a continuation of the sigmoid sinus of the dura mater; joins the subclavian vein to form the brachiocephalic vein
  subtype:  labial_vein__vena_labialis  a vein draining the lips of the mouth
     subtype:  inferior_labial_vein__vena_labialis_inferior  a tributary of the facial vein that drains the lower lip
     subtype:  superior_labial_vein__vena_labialis_superior  a tributary of the facial vein that drains the upper lip
  subtype:  vena_labialis__labial_vein  veins draining the lips of the vulva
     subtype:  venae_labiales_anteriores__anterior_labial_veins  veins from the labia majora to the external pudendal vein
     subtype:  venae_labiales_posteriores__posterior_labial_veins  veins that pass posterior from the labia majora to the internal pudendal vein
  subtype:  labyrinthine_vein__internal_auditory_vein  veins that drain the inner ear
  subtype:  lacrimal_vein__vena_lacrimalis  drains the lacrimal gland; empties into the superior ophthalmic vein
  subtype:  laryngeal_vein__laryngealvein__vena_laryngea  one of two veins draining the larynx
  subtype:  lingual_vein__lingualvein__vena_lingualis  a vein that receives blood from the tongue and the floor of the mouth and empties into the internal jugular or the facial vein
  subtype:  lumbar_vein__vena_lumbalis  veins that drain the posterior body wall and the lumbar vertebral venous plexuses
  subtype:  maxillary_vein__maxillaryvein__vena_maxillaris  posterior continuation of the pterygoid plexus; joins the superficial temporal vein to form the retromandibular vein
  subtype:  meningeal_veins__meningealvein__venae_meningeae  veins at accompany the meningeal arteries
  subtype:  mesenteric_vein__vena_mesenterica  a tributary of the portal vein passing from the intestine between the two layers of mesentery
  subtype:  metacarpal_vein__vena_metacarpus  dorsal and palmar veins of the hand
  subtype:  metatarsal_vein__vena_metatarsus  dorsal and plantar branches of veins serving the metatarsal region of the foot
  subtype:  musculophrenic_vein__vena_musculophrenica  veins that drain the upper abdominal wall and the lower intercostal spaces and the abdomen
  subtype:  nasofrontal_vein__nasofrontalvein__vena_nasofrontalis  a vein located in the anterior medial part of the orbit; connects the superior ophthalmic with the angular vein
  subtype:  oblique_vein_of_the_left_atrium__vena_obliqua_atrii_sinistri  a tributary of the coronary sinus; on the posterior wall of the left atrium
  subtype:  obturator_vein__obturatorvein__vena_obturatoria  a vein formed by the union of tributaries that drain the hip joints and thigh muscles; empties into the internal iliac vein
  subtype:  occipital_vein__occipitalvein__vena_occipitalis  a vein that drains the occipital region
  subtype:  ophthalmic_vein__vena_ophthalmica  either of two veins that serve the eye; empties into the cavernous sinus
     subtype:  inferior_ophthalmic_vein  a vein that drains a venous network in the floor and medial wall of the eye socket
     subtype:  superior_ophthalmic_vein  a vein that begins at the inner angle of the eye socket and passes through the superior orbital fissure to empty into the cavernous sinus
  subtype:  ovarian_vein__ovarianvein__vena_ovarica  one of the veins that drain the ovaries; the right opens into the inferior vena cava; the left opens into the left renal vein
  subtype:  palatine_vein__vena_palatina  a vein that drains the region of the palate and empties into the facial vein
  subtype:  pancreatic_vein__venae_pancreatica__venaepancreatica  veins draining the pancreas and emptying into the superior mesenteric and splenic veins
  subtype:  paraumbilical_vein__paraumbilicalvein__vena_paraumbilicalis  small veins arising in skin around the navel; terminate as accessory portal veins
  subtype:  parotid_vein__parotidvein  parotid branches of the facial vein; drain part of the parotid gland and empty into the retromandibular vein
  subtype:  pectoral_vein__vena_pectoralis  veins that drain the pectoral muscles and empty into the subclavian vein
  subtype:  perforating_vein__perforatingvein__venaperforanti  veins that accompany the perforating arteries; drain leg muscles; empty into the deep femoral vein
  subtype:  pericardial_vein__pericardialvein__venapericardiaca  several small veins from the pericardium
  subtype:  peroneal_vein__fibular_vein__fibularvein__vena_peroneus  accompany the peroneal arteries; arising in the heel and running up the back of the leg to join the posterior tibial veins of the popliteal vein
  subtype:  pharyngeal_vein__vena_pharyngeus  veins from the pharyngeal plexus that empty into the internal jugular vein
  subtype:  phrenic_vein__phrenicvein__vena_phrenica  either of two veins that drain the diaphragm
  subtype:  popliteal_vein__poplitealvein__vena_poplitea  a vein arising in the knee and ascending to become the femoral vein
  subtype:  hepatic_portal_vein__portal_vein__vena_portae  a short vein that carries blood into the liver
  subtype:  posterior_vein_of_the_left_ventricle__vena_posterior_ventriculi_sinistri  arises near the apex of the heart and empties into the coronary sinus
  subtype:  prepyloric_vein__vena_pylorica  a tributary of the right gastric vein
  subtype:  pudendal_vein__venae_pudendum__venaepudendum  vein of the pudendum
  subtype:  pulmonary_vein__pulmonaryvein__vena_pulmonalis  any of four veins that carry arterial blood from the lungs to the left atrium of the heart
     subtype:  inferior_pulmonary_vein__vena_pulmanalis_inferior  either of two pulmonary veins (left and right) returning blood from the inferior lobes of the lungs
     subtype:  superior_pulmonary_vein__vena_pulmonalis_superior  either of two pulmonary veins (left and right) returning blood from the superior lobes of the lungs
  subtype:  radial_vein__vena_radialis  superficial veins ascending the radial side of the forearm; combines with the ulnar veins to form the brachial vein
  subtype:  renal_vein__renalvein__vena_renalis  veins that accompany renal arteries; open into the vena cava at the level of the 2nd lumbar vertebra
  subtype:  sacral_vein__vena_sacralis  vein of the sacral region
  subtype:  saphenous_vein__saphenousvein__vena_saphena  either of two chief superficial veins of the leg that drain blood from the foot
     subtype:  long_saphenous_vein__great_saphenous_vein__greatsaphenousvein  the longest vein in the body; runs from foot to the groin where it joins the femoral vein
     subtype:  short_saphenous_vein__shortsaphenousvein  a vein running from the foot up the back of the leg to the knee
  subtype:  scleral_veins__scleralvein__venae_sclerales__venaesclerale  tributaries of the anterior ciliary veins that drain the sclera of the eye
  subtype:  scrotal_vein__scrotalvein__vena_scrotalis  veins passing from the scrotum to the pudendal veins
  subtype:  sigmoid_vein__sigmoidvein__venasigmoideu  tributaries of the inferior mesenteric vein; drains the sigmoid colon
  subtype:  spinal_vein__vena_spinalis__venaspinali  veins that drain the spinal cord
  subtype:  splenic_vein__splenicvein__vena_lienalis  a vein formed by several small veins on the surface of the spleen; joins the superior mesenteric to form the portal vein
  subtype:  sternocleidomastoid_vein__sternocleidomastoidvein__vena_sternocleidomastoidea  drains the sternocleidomastoid muscle; empties into the internal jugular vein
  subtype:  stylomastoid_vein__vena_stylomastoidea  a vein that drains the tympanic cavity and empties into the retromandibular vein
  subtype:  subclavian_vein__vena_subclavia  a continuation of the axillary vein; joins the internal jugular to form the brachiocephalic vein
  subtype:  sublingual_vein__vena_sublingualis  a tributary of the lingual vein
  subtype:  supraorbital_vein__vena_supraorbitalis  drains the front of the scalp; unites with the supratrochlear vein to form the angular vein
  subtype:  supratrochlear_vein__vena_supratrochlearis  drains the front of the scalp; unites with the supraorbital vein to form the angular vein
  subtype:  temporal_vein__vena_temporalis  any of several veins draining the temporal region
     subtype:  deep_temporal_vein  temporal veins that empty into the pterygoid plexus
     subtype:  middle_temporal_vein  arises near the eye; joins the superficial temporal veins to form the retromandibular vein
     subtype:  superficial_temporal_vein  join the middle temporal vein to empty into the retromandibular vein
  subtype:  testicular_vein__vena_testicularis  a vein from the testicles
  subtype:  thalamostriate_vein  a vein serving the thalamus and corpus striatum
     subtype:  superior_thalamostriate_vein  a long vein that helps to form the internal cerebral vein
     subtype:  inferior_thalamostriate_vein__striate_vein__striatevein  tributaries to the basal vein
  subtype:  thoracoepigastric_vein__thoracoepigastricvein__vena_thoracoepigastrica  a vein arising from the region of the superficial epigastric vein and opening into the axillary vein or thoracic vein
  subtype:  thoracic_vein__vena_thoracica  veins that drain the thoracic walls
  subtype:  thyroid_vein__thyroidvein__vena_thyroidea  any of several small veins draining blood from the thyroid area
     subtype:  inferior_thyroid_vein  any of several veins on each side that drain the thyroid gland and empty into the innominate vein
     subtype:  middle_thyroid_vein  a vein on each side that drains the lateral part of the thyroid and empties into the internal jugular vein
     subtype:  superior_thyroid_vein  a vein on each side that drains the upper part of the thyroid and empties into the internal jugular vein
  subtype:  tibial_vein__vena_tibialis  veins of the lower leg; empty into the popliteal vein
  subtype:  tracheal_vein__vena_trachealis  several small veins from the trachea
  subtype:  tympanic_vein  veins from the tympanic cavity that empty into the retromandibular vein
  subtype:  ulnar_vein__ulnarvein__vena_ulnaris  any of several veins of the forearm
  subtype:  umbilical_vein__umbilicalvein__vena_umbilicalis  a vein in the umbilical cord; returns nutrient blood from the placenta to the fetus
  subtype:  uterine_vein__uterinevein  one of two veins on each side that arise from the uterine plexus and empty into the internal iliac vein
  subtype:  varicose_vein  a vein that is permanently dilated; most common in the legs
  subtype:  vena_bulbi_penis  vein of the head of the penis; tributary of the internal pudendal vein that drains the perineum
  subtype:  vena_canaliculi_cochleae  vein of the cochlear canal
  subtype:  vein_of_penis  a vein serving the penis
     subtype:  venae_dorsales_penis_superficiales  superficial dorsal veins of the penis; paired tributaries of the external pudendal veins on each side
     subtype:  venae_dorsales_penis_profunda  deep dorsal vein of the penis; tributary of the prostatic plexus
     subtype:  vena_profunda_penis  deep vein of the penis; enters the prostatic plexus
  subtype:  vena_bulbi_vestibuli  vein of the vestibular bulb
  subtype:  vena_cava  either of two large veins that return oxygen-depleted blood to the right atrium of the heart
     subtype:  inferior_vena_cava__postcava  receives blood from lower limbs and abdominal organs and empties into the posterior part of the right atrium of the heart; formed from the union of the two iliac veins
     subtype:  superior_vena_cava__precava  receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins
  subtype:  venae_palpebrales__venaepalpebrale  veins of the eyelids
  subtype:  venae_interlobulares_hepatis  interlobular veins of the liver
  subtype:  venae_renis__venaereni  veins of the kidney; drain the kidney into the renal vein
     subtype:  venae_interlobulares_renis  interlobular veins of the kidney; receive blood from the arcuate vein and empty into the renal veins
  subtype:  vertebral_vein__vertebralvein__vena_vertebralis  a vein that goes through the foramina of the cervical vertebrae and forms a plexus around the vertebral artery; empties into the brachiocephalic vein
  subtype:  vesical_vein__vesicalvein__venavesicali  veins that drain the vesical plexus and join the internal iliac veins
  subtype:  vestibular_vein__vena_vestibularis  veins that drain the saccule and utricle
  subtype:  vortex_vein__vorticose_vein__vorticosevein__vena_vorticosum  a vein formed by branches from the back surface of the eye and the ciliary body; empties into the ophthalmic veins
  subtype:  venule__venula__capillary_vein__capillaryvein  a minute vein continuous with a capillary
     subtype:  episcleral_veins__venae_episclerales  small veins in the sclera near the corneal margin; empty into the anterior ciliary veins
     subtype:  stellate_venule  a star-shaped group of venules in the renal cortex

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