Question

The largest number of cell bodies of neurons in our body is found in
A. Brain
B. Retina
C. Spinal cord
D. Tongue

Answer 1

The brain is the site of processing and the control system of the body. The brain contains about 100 billion neurons. The number of neuroglial cells present in the brain is one trillion. The spinal cord links the brain and organs of the body.

Complete answer: The brain is the site of processing and the control system of the body. The brain contains about 100 billion neurons. The number of neuroglial cells present in the brain is one trillion.
It controls the voluntary movements, the balance of the body, functioning of vital involuntary organs, thermoregulation, hunger, thirst, circadian rhythms of our body, activities of several endocrine glands, and human behavior. It is also for the processing of vision, hearing, speech, memory, intelligence, emotions, and thoughts.
As the brain integrates the information received from sensory neurons and transmits back the reactions or impulses to effectors, therefore the number of cell bodies in the brain is maximum.

So the correct option is A. Brain.

Note: Medulla oblongata comes out from the foramen magnum and continues in the neural canal of the vertebral column, called the spinal cord. It extends from the base of the skull to the lumbar vertebra. Its upper part is wide while the lower part is known as conus-medullaris.
Functions of the spinal cord are-
1. It links the brain and organs of the body.
2. It also provides a relay path for the impulses coming from the brain.
3. The spinal cord regulates and conducts the majority of the reflex action.