Flashcards in Brain, Blood Supply, And Cranial Meninges Deck (98)
What makes up the brain stem?
What are the parts of the brain?
-telencephalon (cerebral hemispheres)
What are the parts of the diencephalon
What are the parts of the medulla?
-anterior median fissure
Anterior median fissure of the medulla
Continuous inferiorly with anterior median fissure of spinal cord
Pyramids of medulla
Two longitudinal columns ( one on each side of the anterior median fissure)
Olive of the medulla
Oval elevation lateral to upper part of pyramid
Pre-olivary sulcus of the medulla
Located between the pyramid and the olive
Attachments of rootlets of hypoglossal nerve (CN XII)
Retro-olivary sulcus of the medulla
-located posterior to olive
-attachment of rootlets of glossopharyngeal (CN IX) and vagus (CN X) nerves (in line with attachment of rootlets of accessory nerve/CN XI)
Medullopontine sulcus of the medulla
Nerves that attaché (from medial to lateral)
-abducens (CN VI)
-facial nerve (CNVII)
-vestibulocochlear (CN VIII)
-trigeminal nerve (CN V) attaches to anterior surface of pons
cerebral crura (cerebral peduncles)
-two columns of descending fibers (one on each side)
Occulomotor nerve (CN III) attaches to medial border of cerebral crus
-posterior surface of brainstem
-cavity between cerebullum (posteriorly) and pons and upper medulla (anteriorly)
When can the posterior surface of the brainstem be viewed completely?
When cerebellum is removed by cutting 3 pairs of cerebellar peduncles (superior, middle, and inferior) that connect cerebellum to brainstem
What is the posterior surface of the lower medulla similar to?
Posterior surface of cervical and upper thoracic spinal cord
Posterior surface of upper medulla and posterior surface of pons form what?
The floor of 4th ventricle, called the rhomboid fossa
What are the elevations of the posterior surface of midbrain?
Two superior colliculi
-part of visual system
Two inferior colliculi
-part of the auditory system
What is the only cranial nerve attaches to posterior surface of brainstem?
Trochlear nerve (CN IV)
-emerges immediately below inferior colliculus
What are the right and left cerebral hemispheres separated by?
-separation is incomplete
-at bottom of longitudinal fissure, there is a large bundle of fibers (corpus callosum) that connects right and left hemispheres
How many lobes does each hemisphere have?
What are the lobes that each hemisphere contains?
Which lobe is hidden in the lateral sulcus?
What separates the frontal and parietal lobes?
What separates the temporal lobe from frontal and parietal lobe?
What two arteries provided the arteries last supply of the brain?
-internal carotid arteries
What part of the subclavian does the vertebral artery come off of?
Where does the vertebral artery enter the cranial cavity?
Where do the right and left vertebral arteries join each other?
At medullopontine sulcus to form basilar artery
How does the basilar artery run?
Along midline of anterior surface of pons and ends at upper end of pons by dividing into right and left posterior cerebral arteries (terminal branch)