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CNS anatomy lec 5

Brainstem

QuestionAnswer
where is the midbrain located? rostral (ie. sup) to pons
what are the two lateral halves of midbrain called? cerebral peduncles
the substantia nigra divides the cerebral peduncles into? crus cerebri (ant) and tegmentum (post)
what is interpeduncular fossa? a deep depression in the midline that separates the crus cerebri
what are the components of crus cerebri? a groove from which the oculomotor nerve emerges medially. a posterior perforated structure for the passage of blood vessels
lateral geniculate body in the lateral surface of midbrain, connected by the sup brachium to sup colliculus
medial geniculate body in the lateral surface of midbrain, connected by the inf brachium to the inf colliculus
tectum post surface of midbrain, has 2 sup and 2 inf colliculi
sup colliculi are the centers of what reflexes? visual reflexes
inf colliculi are the center of? lower auditory centers
what are two special characteristics of the trochlear nerve? the only cranial nerve that emerges from the post aspect of the brainstem. the only cranial nerve to decussate
what are internal structures of the midbrain at the level of inf colliculi? decussation of sup cerebral peduncles medial, trigeminal, spinal, and lateral lemnisci trochlear nuclei
describe the pathway of the trochlear nerve from the trochlear nuclei (ant to the periaqueductal gray mater) running laterally backward and curves medially to crossover in the sup medullary velum
what are internal structures of the midbrain at the level of sup colliculi? corticospinal & corticobulbar tracts red nucleus medial, spinal, & trigeminal lemnisci mesencephalic nucleus nucleus of oculomotor sup colliculus
where are the corticospinal and corticobulbar nuclei located & what is their function? in the middle 2/3 of cerebral crus in midbrain, function in voluntary movement of the body and face
what is the outcome of lesions in the corticospinal/ balbar tracts?
Created by: dima.saadeh03
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