Reflexes

Question 1

Classify a simple stretch reflex

Answer 1

Monosynaptic
Ipsilateral
Intra-segmental

Question 2

What is reciprocal inhibition?

Answer 2

1a afferent also synapse with an inhibitory interneuron, inhibiting the alpha motor neuron of an antagonist muscle, allowing it to relax

Question 3

Classify and describe a flexor withdrawal reflex

Answer 3

Noxious stimuli applied to skin
Impulses conduct through afferent fibres
Polysynaptic connections made with excitatory interneurons
Causes ipsilateral flexor muscle to contract
Limb moves away

Polysynaptic
Ipsilateral
Inter-segmental

Question 4

Classify and describe a crossed extension reflex

Answer 4

Noxious stimuli activated pain fibres
Impulses carried via afferent vibres
Collateral sent through anterior commissure to alpha motor neuron innervating contralateral flexors and extensors
Relaxation of contralateral flexors and contraction of contralateral extensors
Extension of contralateral limb and withdrawal of ipsilateral limb

Polysynaptic
Contralateral
Inter segmental