Lesions & Tracts - Bales Flashcards Preview

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Flashcards in Lesions & Tracts - Bales Deck (15):
1

Leaves sensory and extrapyramidal input intact; sxs: spastic paralysis, no atrophy

UMN lesion

2

Sxs: hypotonia/atonia, hyporeflexia/areflexia, flaccid paralysis

LMN lesion

3

Progressive death of motor neurons; initial sx are either LMN or UMN, but ultimately mixed

ALS

4

Where in the corticospinal tract (CST) are the giant Betz cells located?

Layer 5

5

Which fibers and from which nucleus cross immediately in ventral segmental decussation of mesencephalon?

Rubrospinal fibers from red nucleus

6

Which fibers and from which nucleus cross immediately in dorsal segmental decussation of mess encephalon?

Tectospinal fibers from superior collicus

7

Which tract is in the ventral funiculus and is excitatory to extensors and inhibitory to flexors?

Pontine reticulospinal tract

8

Which tract is in the lateral funiculus and is inhibitory to extensors and excitatory to flexors?

Medullary reticulospinal tract

9

Contralateral eye turned up and in

Trochlear (CN IV) nerve lesion

10

Sxs: bilateral ptosis, bilateral elevation loss, ipsilateral eye turned out, ipsilateral loss of convergence

Unilateral Oculomotor (CN III) LMN lesion

11

What is the corticonuclear tract (CNT) pathway?

Lower lateral gyrus → genu of PLIC → medial end of middle 3/5 of crus cerebri

12

Sxs: drooping lid, abduction of unopposed lateral rectus, cannot elevate because of inferior oblique and superior rectus palsy

LMN ipsilateral lesion

13

Sxs: elevation weakness

LMN contralateral lesion

14

Sxs: dilated pupil, focusing weakness

E-W nucleus

15

Sxs: Abducted eye & large pupil

CN III + E-W