Question
Question: The “butterfly” like structure surrounding the central region of human’s spinal cord is called as ...
The “butterfly” like structure surrounding the central region of human’s spinal cord is called as
A. Funiculus
B. Horn
C. White matter
D. Grey matter
Solution
Spinal cord transfers impulses from body parts to brain and vice-versa. It consists of grey matter, white matter, horn, funiculus, spinal nerves and motor nerves. Grey matter is present in the center of the human spinal cord which helps to transmit impulses.
Complete answer:
Spinal cord, it is the part of the central nervous system. It is located in the base of the brain and continues down almost to the bottom of the spine. It is the mediator between brain and sensory neurons. It transfers messages from the brain. It is mainly covered by the three layers of tissue (meninges).
The spinal cord consists of white and grey matter. The grey matter appears as a butterfly shaped in the center of the cord. Motor nerves are present in the front wings that are also called horns. These help in transmission of information from the brain or spinal cord to the muscles and stimulate movement. Sensory nerves are present in the back horns which take impulses from other parts of the body and transfer it to the brain. Columns of Nerve fibers are present in the white matter which carries the sensory information to the brain from the rest of the body (ascending tracts) and descending tracts which carry motor impulse from brain to the muscles. Funiculus is the bundle of nerve fibers that refers to the subdivision of white matter of the spinal cord.
From the above information we have found that grey matter is the butterfly-like structure surrounding the central region of a human's spinal cord.
Hence, the correct answer is option (D).
Note: Spinal cord also consists of Dura mater, pia meter, dorsal root ganglion, ventral root, are central canal, posterior median sulcus and anterior spinal artery. It performs voluntary and involuntary actions of the body. Brain also has grey matter and white matter but at a different place. It is the vital body part. It helps to regulate reflex actions of the boys.