Lec 13: Review of Anatomy, Physiology and Motor Exam Flashcards Preview

[OS 211] Exam 1 Adre > Lec 13: Review of Anatomy, Physiology and Motor Exam > Flashcards

Flashcards in Lec 13: Review of Anatomy, Physiology and Motor Exam Deck (25)
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1

Where are most of the upper motor neurons located?

precentral gyrus (Brodmann area 4)

2

What are the tracts connected to the cortical motor neurons?

corticospinal, corticobulbar, corticorubrospinal, corticoreticulospinal, corticovestibulospinal, corticotectospinal

3

Where are lower motor neurons located in the corticospinal tract?

anterior horn of the spinal cord (composed of alpha motor neurons and projections to muscles)

4

Where are lower motor neurons located in the corticobulbar tract?

cranial nerve motor nuclei of motor and mixed CNs along with projections to the muscles of the face, head, and neck

5

Why is denervation atrophy more pronounced in LMN paralysis?

in an UMN paralysis, there is still stimulation from the LMN

6

What causes spasticity and hyperreflexia in UMN paralysis?

lack of inhibition from the UMNs causes the LMN to function primitively and without inhibition

7

(T/F) An abnormal EMG-NCV is reflective of both UMN and LMN dysfunction.

F

8

What are the direct activation pathways?

corticospinal and corticobulbar tracts

9

What is the function of direct activation pathways?

make muscles move and give strength (gross movement
)

10

What are the control circuits?

basal ganglia, cerebellum, and thalamus

11

What are the indirect activation pathways?

rubrospinal, vestibulospinal, reticulospinal, and tectospinal

12

What is the only part of the body with Betz (giant pyramidal cells) cells?

corticospinal tract

13

What are the components of the final common pathway?

LMN with muscle that it innervates

14

What are the different types of movement?

reflex, voluntary movement, rhythmic motor patterns

15

What is the main neurotransmitter of DAPs?

glutamate

16

How can you differentiate a supratentorial from an infratentorial lesion based on primary gaze?

supratentorial - towards lesion
infratentorial - away from lesion

17

Where does decussation occur for the fibers of the corticospinal tract?

medullary pyramids

18

What is the order of the innervating fibers of the corticospinal tract when passing through the posterior limb of the internal capsule?

leg -> arm -> trunk -> head (lateral to medial)

19

What is the order of the innervating fibers of the corticospinal tract when passing through the lateral funiculus?

sacral -> lumbar -> thoracic -> cervical (lateral to medial)

20

Which CNs do not have corticobulbar tracts fibers?

CN I, II, VIII (purely sensory)

21

Which is more medial? corticospinal or corticobulbar tract fibers?

corticobulbar

22

How can you differentiate a central facial palsy from a peripheral facial palsy?

CFP - contralateral paralysis of the LOWER half of the face
PFP - ipsilateral hemiparalysis

23

What is the neurotransmitter used in the final common pathway?

acetylcholine

24

What are the two types of sensory receptors in muscles?

muscle spindle - conveys stretch sensation
golgi tendon organ - senses muscle tension

25

What types of afferent fibers regulate the golgi tendon and stretch reflexes?

stretch - IA
GT - IB