Spinal Level Reflexes

Question 1

Involuntary Responses

Answer 1

basic, specific, and predictable
dependent upon an intact reflex arc
may be monosynaptic or polysynaptic
The basis for unconscious motor functions and basic defense mechanisms

Question 2

Stretch reflex

Answer 2

stim: muscle stretch
function: maintain muscle tone, support agonist muscle contraction
Sensitivity and intactness of the SC segment are tested by applying a stretch to the deep tendon

Question 3

Inverse stretch reflex

Answer 3

Stim: muscle contraction
function: provide agonist inhibition, diminution of force of agonist contraction

Question 4

Gamma Reflex Loop

Answer 4

allows muscle tension to come under control of descending pathways, regulating level of tension in muscle

Question 5

Flexor Reflex

Answer 5

Stimulus: cutaneous sensory stimuli to the flexor muscle
protective withdrawal to remove the body part from harmful stimuli

Question 6

Crossed extension reflex

Answer 6

Stimulus: painful stimuli and reciprocal action of antagonist, opposite responses occur in opposite limbs
function: coordinates reciprocal limb activities such as gait