Question

A ramus communicans consists of
A. White ramus only
B. Grey ramus only
C. Both A and B
D. Red Ramus only

Answer 1

Hint: The spinal cord is part of the central nervous system. The nerve fibres conduct the signals to and fro the spinal cord. These signals are sorely responsible for the perception of the actions. They form the sympathetic and non-sympathetic system of the nervous system.

Complete answer:
What is ramus? An arm or bone branch that are adjacent to each other is a ramus.

What is ramus communicans? The nerve which will be a link between the other two nerves is the ramus communicant/communicating branch. To be more specific it will connect the spinal cord and the sympathetic trunk.

Let us see which is part of ramus communicans.
> Option A: White ramus: They are present for the conduction of signals in the sympathetic nervous system, the outflow of the preganglionic sympathetic nerve fibres.
> Option B: Grey ramus: They are also the sympathetic nerve fibres having highly unmyelinated neurons.
> Option D: Red ramus: This is the ventral ramus carrying motor and sensory information to and fro from vent=trilateral body, limbs, body wall. They conduct the nerve fibres to the remaining upper and lower limbs.

Hence, The correct answer is option (C).

Note: The study of the brain is neurology. It consists of a study of the central nervous system, including the brain and spinal cord. The reflex actions occurring in/by our body are studies under this field. They make the sympathetic and non-sympathetic nervous system controlling the sensory and motor nerves. The ramus communicans form that links between the spinal cord and sympathetic nerves which will connect to the ganglia.