Question

Choose the correct answer from each of the four options given below:

The dorsal root ganglion of the spinal cord contains cell bodies of the

• A. Motor neuron
• B. Sensory neuron
• C. Intermediate neuron
• D. Association neuron

Answer 1

The correct option is B

Sensory neuron

The correct option is (B)

Explanation of correct option:

• Spinal Cord:

1. The spinal cord is a long tube-like structure that arises from the part of the brain, i.e., the medulla oblongata part.
2. It is 40 cm long and 2 cm wide.
3. It creates an important link between the brain and the body.
4. It also coordinates the reflexes.
5. The spinal cord carries sensory signals from all parts of the body to the Central Nervous System through nerve fibers, specifically afferent fibers.
6. Each segment of the spinal cord is connected to a pair of ganglia called the dorsal root ganglia, located just outside the spinal cord and containing cell bodies of sensory neurons.
7. These neurons travel through the dorsal roots to the spinal cord.

Explanation of the incorrect option:

Option (A): Motor neurons -

1. The ventral roots consist of axons from motor neurons, which carry information from cell bodies within the CNS to the periphery.

Option (C): Intermediate neuron -

1. The dorsal and ventral roots unite and exit the intervertebral foramina as they become spinal nerves.
2. They transfer the signal between the sensory and motor neurons.

Option (D): Associating neurons -

1. They are also known as the intermediate neurons or interneurons.
2. So, this option is also incorrect.

Final Answer:

The dorsal root ganglion of the spinal cord contains cell bodies of the sensory neurons.