Question

The term "grey matter" refers to
A. neurons that are unmyelinated
B. axons that are myelinated
C. dendrites that are myelinated
D. neurons that are myelinated

Answer 1

Hint: The grey matter in our body is connected with the sensory-motor system. The cells in our body are aligned with them. They aid in the transmission of impulses and the proper functioning of our body. In the middle of the human spinal cord, grey matter is present, which helps to transmit impulses.

Complete answer: Grey matter refers to the part of the neuron that is not surrounded by the sheath of myelin. The nerve cells or the soma are not covered with the myelin sheath along with its dendrites. They make up the grey matter, then. The Ependymal cells are the glial cells in the choroid plexus that are present. These cells together take part in the creation of cerebrospinal fluid. They do not consist of grey matter. Myelinated nerve fibres. So, white matter is created by them. It consists of white and grey matter in the spinal cord. In the centre of the cord, the grey matter is shaped like a butterfly. In the front wings, which are also called horns, motor nerves are present. These help to transfer information to the muscles from the brain or spinal cord and induce motion. Sensory nerves are found in the back horns that take impulses and move them to the brain from other areas of the body. In the white matter that brings sensory input to the brain from the rest of the body (ascending tracts) and descending tracts that bring motor signals from the brain to the muscles, there are columns of nerve fibres. The funiculus is the nerve fibre bundle that corresponds to the white matter subdivision of the spinal cord.
The grey matter consists primarily of unmyelinated axons and neuronal cell bodies. These axons are mostly unmyelinated in the grey matter, meaning they are not covered by a whitish, fatty protein called myelin. The grey matter in the brain is used to store information.
Therefore, A-' unmyelinated neurons' is the right response.

Note: The bulk of the neuronal cell bodies of the brain are found in grey matter. The grey matter also covers the brain regions involved in muscle regulation and sensory perception, such as seeing, hearing, memory, feelings, voice, etc. The anterior grey column comprises motor neurons and the posterior grey column contains synapse points for sensory neurons. They obtain sensory input from the body, and this information is soon transmitted from receptors to the spinal cord in the spinal tracts of the skin, bones, and joints.