Card Set Information
What are the major subdivisions of the brainstem?
Midbrain, Pons, Medulla
What are the landmarks for the major brainstem division?
Midbrain: caudal to mammillary bodies, rostral to superior pontine sulcus
Pons: between superior and inferior pontine sulcus
Medulla: caudal to inferior pontine sulcus
What are the landmarks visible from a dorsal view of the brain stem?
Midbrain: Tectum (superior and inferior colliculi)
Pons: Cerebellar penducles, 4th ventricle (if cerebellum is removed)
Medulla: 4th ventricle, F. Gracilis & Cuneatus
Cranial Nerve Nuclei
, Other... give specific examples of each
All three cerebellar penducles, pontine nuclei, inferior olive
Corticospinal tract, corticobulbar tract, upper motor neurons (reticular formation, vestibular nuclei, superior colliculus)
N. Gracilis & Cuneatus, Medial Lemniscus, ALS, trigeminothalamics
Substantia nigra, MLF, reticular formation (pain modulation, sleep cycle, respiration, cardiovascular)
How can cranial nerve lesions be localized?
Symptoms specific to cranial nerve nuclei, in combination with those from ascending/descending pathway damage, will localize the lesion to a specific brainstem level
What are the points of exit/entrance of cranial nerves III-XII?
Midbrain: III, IV
Pons-Medulla Junction: VI-VIII
Location of cranial nerve nuclie: