Brainstem Arterial Supply, Cranial Nerve Lesions Flashcards
Where does the corticospinal tract decussate in brainstem
Caudal medulla (above the pyramids)
Where does the dorsal column-medial lemisicus decussate
medulla
What 4 structures does the posterior inferior cerebellar artery supply in the medulla
- spinothalmic tract
- inferior cerebellar peduncle
- Nucleus ambiguus
- Lateral spinothalmic tract
How can a stroke of the facial motor cortex be distiguished from Bell’s palsy
- Stroke: facial motor cortex will spare upper face (eyebrows move)
- Bell’s: will involve entire side of the face
Lesion in cortical motor face region
paralysis of contralateral side of lower face
lesion of facial nerve or nucleus
paralysis of ipsilateral side of entire face
lesion of vagus nerve or nuclei–> which way will uvula deviate
opposite the lesion
lesion of right corticolbulnar tract or soft palate portion of right motor cortex, which way will uvula deviate
to the right (points to lesion if upper)
damage to right hypoglossal nerve or nucleus
tongue deviates towards lesion (lick your wounds)
damage to right motor cortex involving tongue or the corticobulbar tract to it
point away from lesion–> to the left (contralateral muscles weakened)
6 diseases that may cause Bells Palsy (my lovely bella had An STD)
- Lyme disease
- Herpes zoster
- AIDS
- Sarcoidosis
- Tumors
- Diabetes
*kinda just have to memorize the first two
What three strctures in the medulla supplied by anterior spinal artery
- Hypoglossal nucleus
- Medial leminsicus
- Medullary pyramids
2 structures in the Pons supplied by paramedian branches
- medial leminiscus
2. corticospinal tract
CN nucleus in rostral pons
CN V, trigeminal
two CN nuclei in lateral caudal Pons
- Facial (CN VII)
2. Vestibular (CN VIII)
