8. A withdrawal reflex consists of synapses between neurons in the order of: A.

Question

8. A withdrawal reflex consists of synapses between neurons in the order of:
A. spinal cord interneuron > afferent sensory neuron > efferent motor neuron
B. spinal cord interneuron > efferent sensory neuron > afferent motor neuron
C. afferent sensory neuron > spinal cord interneuron > efferent motor neuron
D. efferent sensory neuron > spinal cord interneuron > afferent motor neuron

7.

Cell bodies (soma) of alpha motor neurons are located in the ______________________.
A. doral (posterior) horn
B. ventral (anterior) horn
C. lateral horn

Explanation / Answer

8. C. Afferent neurons carry the signals from the receptors to the Spinal cord, the dendrites of the afferent synapse with the cell bodies of the interneuron that lies inside the dorsal horn of grey matter in the spinal cord where it relays the signal from the afferent neurons to the efferent neurons. efferent neurons have their cell bodies inside the ventral horn of the grey matter synapsing with the dendrites of the interneurons. These efferent neurons then carry the signal to the effector muscles and a reflex response is generated.

Inside the spinal cord:

Afferent neurons (dendrites)----->Cell body of interneuron---->dendrites of interneuron----->cellbodies of the efferent

---------------------------------dorsal horn-------------------------------------------------------------------Ventral horn------------------------------

9. Ventral horn. Explained above.

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