Midterm Part 4 Proprioceptors: Joint Kinesthetic Receptors

Question 1

Proprioceptors affect tone via three reflexes:

Answer 1

1. quick stretch reflex
2. reciprocal inhibition
3. autogenic inhibition

Question 2

Quick Stretch Reflex is a reflex response from… and produces….

Answer 2

muscle spindles.

contraction of muscle being stretched via sensory, to spinal cord, to alpha motor neuron (monosynaptic)

Question 3

Functions of Quick Stretch Reflex

Answer 3

monitors status of muscle activity

guards against potential injury

respond to rapid and sustained pressure

Question 4

Reciprocal Inhibition is a reflex response from… and produces…

Answer 4

muscle spindles.

inhibition of antagonist so agonist can contract and cause joint movement

Question 5

Reciprocal Inhibition sequence

Answer 5

stretching via muscle contraction stimulates muscle spindle, spindle afferent to spinal cord, inhibitory interneuron inhibits antagonist, relaxes antagonist

Question 6

Autogenic Inhibition is a reflex response from… and produces…

Answer 6

GTOs.

produces an inhibitory response to a muscle that develops too much tension either via shortening or lengthening

Question 7

Autogenic Inhibition Functions:

Answer 7

• guards against potential injury to muscles’ fibers

- muscle relaxation reduces tension applied o the muscle and tendons and protects them from damage

Question 8

Autogenic Inhibition Sequence

Answer 8

stretching tendon activated GTO neurons lb, to spinal cord, synapse w inhibitory interneurons and excitatory interneurons, inhibits agonist and activates antagonist

Question 9

DTRs or Deep Tendon Reflexes are part of routine orthopedic and neurological examinations. What do they do?

Answer 9

test the integrity of the components of the simple reflex arc and contributes to determining if there is a lower motor neuron lesion or an upper motor neuron lesion