40. The cell bodies of neurons whose conductile processes are located lie in the

Question

40. The cell bodies of neurons whose conductile processes are located lie in the periphery and conduct action potentials toward the central nervous system are located in the:

a. the ventral horn of the spinal cord.

b. the dorsal horn of the spinal cord

c. Dorsal root ganglia.
d. Ventral root ganglia.

e. spinal cord white matter

38. By severing a tract, one would cut:
a. conductile processes in the central nervous system
b. conductile processes in the peripheral nervous system.
c. input regions in the peripheral nervous system.
d. input regions in the central nervous system.
e. processes that extend for long distances in the cerebral cortex.

39. Destroying neuronal cell bodies in the motor nucleus of the vagus (cranial nerve X) would immediately kill.

a. lower motor neurons.
b. preganglionic sympathetic neurons.
c. postganglionic sympathetic neurons.
d. preganglionic parasympathetic neurons.

e. b and c are correct.

Explanation / Answer

1.c.Dorsal root ganglia

Dorsal root ganglia has the cell bodies of the sensory neurones whose conductive processes carry information to the central nervous system.

The cell bodies mentioned in the question are those of sensory neurons and hence the location is dorsal root ganglia which carries sensory impulses

2.a.Conductile processes in the central nervous system

Tracts travel within the central nervous system communicating between the cerebral cortex and spinal cord hence severing a tract interferes with communication within the central nervous system

3.d.preganglionic parasympathetic neurons

Motor nucleus of vagus gives efferents to all the preganglionic parasympathetic neurons of GIT and hence destroying the cell bodies of motor nucleus of vagus would result in destruction of preganglionic parasympathetic neurons due to absence of input

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