MRCP UK EXAMINATIONS

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NEUROLOGY

SURGERY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The preganglionic fibers of the sympathetic neurons are located in the segments of the spinal cord identified as ____ to ____
A
C1, L5
B
C8, L3
C
C4, L2
D
C3, L8
Explanation: 

Detailed explanation-1: -Intermediolateral nucleus is located in the intermediate zone between the dorsal and the ventral horns in the spinal cord levels. Extending from C8 to L3, it receives viscerosensory information and contains preganglionic sympathetic neurons, which form the lateral horn.

Detailed explanation-2: -The cell bodies of all preganglionic neurons are located within the central nervous system (CNS). The cell bodies of symapathetic preganglionic neurons are located in the visceral efferent (lateral gray) column of the spinal cord.

Detailed explanation-3: -The spinal cord divides into 31 segments: cervical 8, thoracic 12, lumbar 5, sacral 5, and coccygeal 1. These segments consist of 31 pairs of spinal nerves with their respective spinal root ganglia. Spinal nerves contain the motor, sensory, and autonomic fibers. These nerves exit through the intervertebral foramen.

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