Blood Vessels and Lymphatics Flashcards
vertebral a.
20% of blood supply to the brain
supplies brainstem, cerebellum, and upper spinal cord
subcalvian steal syndrome
obstruction of subclavian a proximal to the vertebral a
during exercise blood is shunted from the vertebral system and to the subclavian (mm of the arm)
vertebro-basilar insufficiency
clinical signs: dizziness, cranial nerve dysfunction, paralysis, loss of consciousness
results in: coma, quadriplegia, cranial n abnormalities
ascending cervical a.
runs w/ phrenic n
inferior laryngeal a.
runs w/ recurrent laryngeal n.
deep cervical a. anastomoses w/
deep branch of the occipital a on same side
vertebral a. anastomoses w/
descending branch of the occipital, ascending cervical, opposite vertebral a.
internal carotid a.
80% of blood to the brain
anterior circulation of the circle of willis
circle of willis
distributes most of the blood to the cerebrum
internal carotid a (80%) - anterior
vertebral a (20%) - posterior
components - ant. communicating, ant. cerebral, post. communicating, post. cerebral a.
shunting of blood
may result in hyperfusion and cerebral edema
superior laryngeal a.
branch of superior thyroid a.
runs w/ internal laryngeal n.
Retromandibular v.
formed by the superficial temporal and maxillary v
internal jugular v.
drains primarily the brain
superior bulb of the internal jugular v.
located in the jugular fossa and does not have a valve
inferior bulb of the internal jugular v.
b/w sternoclavicular heads of SCM and has a valve
