Thursday 1 - Fitz - muscle receptors and spinal reflexes actual lecture

Question 1

Where in the CNS are the pattern generators that regulate walking movements (i.e. one leg relaxes when the other contracts)

Answer 1

spinal cord

Question 2

Afferent part of the muscle stretch reflex?

efferent?

Answer 2

Intrafusal fiber

extrafusal fiber

Question 3

Lower motor neuron lesion

dmg to ?

what do you see clinically

Answer 3

damage to alpha motor neurons

flaccid paralysis

Question 4

upper motor neuron lesion

two types

Answer 4

loss of inhibition to alpha motor neurons at the level of the vestibulospinal tract - rigid paralysis or alpha rigidity

loss of inhibition to gamma motor neurons, increased contraction of the intrafusal fibers, increased spindle activity, reflex contraction of the extrafusal fibers. leads to the lengthening reaction.

Question 5

What happens when you stimulate the golgi tendon organ?

what about the spindle

Answer 5

golgi - relaxation of muscle

spindle - contraction

Question 6

clasp knife reflex

Answer 6

muscle is really rigid, relaxes rapidly upon bending because golgi tendon organs force the relaxation

usually a result of upper motor neuron damage