Exam 2 Study Guide 2 Flashcards Preview

7303 Neuroanatomy > Exam 2 Study Guide 2 > Flashcards

Flashcards in Exam 2 Study Guide 2 Deck (33):
1

stretch reflex

- monosynaptic
- muscle contraction in response to a quick stretch

2

stretch reflex aka

- myotatic
- muscle stretch reflex
- deep tendon reflex

3

cutaneous reflex

- goes along with flexion withdrawal reflex
- If you step on something sharp, you have a cutaneous reflex that causes a flexion withdrawal reflex

4

flexion withdrawal reflex

movement of a limb away from a stimulus

5

inverse myotatic reflex

AUTOGENIC INHIBITION
- agonist muscle relaxes after being stretched
- ex. stretching quads causes them to relax

6

reciprocal inhibition in a stretch reflex

- monosynaptic to agonist
- polysynaptic to antagonist

7

stretch reflex: decussation?

no

8

withdrawal reflex: poly/mono

polysynaptic

9

flexion reflex: decussation

- no decussation
- ipsilateral inhibition of extensors + contraction of flexors

10

crossed extension portion: decussation

- decussates in SC
- contralateral inhibition of flexors + contraction of extensors for WB

11

medial CST: direct connection from

cerebral cortex to SC

12

path of medial CST

motor cortex
» medullary pyramids
» SC

(descends in ventral funiculus)

13

medial CST: decussation

does not cross

- innervates ipsilateral side of LMN of trunk, neck, and shoulder

14

Which tract is the most important one controlling voluntary movements?

lateral CST

15

path of lateral CST

motor cortex (motor planning areas)
» axons through internal capsule in peduncles
» through pons/medulla
» 90% of neurons cross at pyramidal decussation
» travels to SC and synapses with LMN

16

reticulospinal tract

- begins in reticular formation
- facilitates bilateral LMNs that innervate postural and gross limb movement of muscles throughout the body

17

rubrospinal tract path

red nucleus
» decussates immediately in brainstem
» travels to cervical cord
» innervates UE (extensors of wrist/fingers)

18

corticobulbar tracts: purpose

- how we get info through cranial nerves and to the face
- motor homunculus through brainstem

19

corticobulbar tracts are important for

- expression
- swallowing
- talking

20

medial CST: synapse between UMN/LMN

cervical spinal cord

21

medial CST: decussation

no
- ipsilateral only

22

medial CST: muscles innervated

- back muscles
- shoulder
- neck

23

medial CST: function

control neck, shoulder, and trunk muscles (posture)

24

lateral CST: start/finish

start: primary motor, premotor, supplementary motor areas

finish: contralateral innervation of limbs

25

lateral CST: synapse between UMN/LMN

cervical spinal cord

26

lateral CST: decussation

some do (lower medulla), some dont

27

lateral CST: muscles innervated

- distal limbs
- fractionate movements

28

lateral CST: function

precise control of contralateral movements of limbs, fractionate movements

29

rubrospinal tract: start/finish

start: red nucleus in midbrain

finish: contralateral upper limb muscles

30

rubrospinal tract: synapse between UMN/LMN

cervical spinal cord

31

rubrospinal tract: decussation

yes, midbrain

32

rubrospinal tract: function

extends wrist and fingers

33

lateral and medial vestibulospinal tracts (inputs)

receive inputs from vestibular apparatus in the ear
- about head position and movement (medial)
- about gravity (lateral)