Select the correct statement regarding spinal cord.

Options

A. it has butterfly shaped gray matter which is present outside white matter
B. It extends from medulla oblongata upto last coccygeal vertebra
C. Its white matter consists chiefly of long, myelinated nerve fibers
D. Dorsal root ganglia contain cell bodies of motor neurons

Answer

To solve the question "Select the correct statement regarding spinal cord," we will analyze each provided statement one by one.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- **Statement:** "It has butterfly-shaped gray matter which is present outside the white matter."
- **Analysis:** In the spinal cord, the gray matter is actually located in the center and has a butterfly or H-shape, while the white matter surrounds it. Therefore, this statement is **incorrect**.

**Hint:** Remember the anatomical arrangement of gray and white matter in the spinal cord.

2. **Evaluate the Second Statement:**
- **Statement:** "It extends from the medulla oblongata up to the last coccygeal vertebra."
- **Analysis:** The spinal cord does indeed extend from the medulla oblongata at the base of the brain down to the level of the first or second lumbar vertebra, but it does not reach the last coccygeal vertebra. Therefore, this statement is **incorrect**.

**Hint:** Consider the actual length and termination point of the spinal cord.

3. **Evaluate the Third Statement:**
- **Statement:** "Its white matter consists chiefly of long myelinated nerve fibers."
- **Analysis:** This statement is **correct**. The white matter of the spinal cord is primarily composed of myelinated axons, which are long nerve fibers that facilitate communication between different parts of the nervous system.

**Hint:** Focus on the composition of white matter and its function in the nervous system.

4. **Evaluate the Fourth Statement:**
- **Statement:** "Dorsal root ganglia contains cell bodies of the motor neuron."
- **Analysis:** This statement is **incorrect**. The dorsal root ganglia contain the cell bodies of sensory neurons, not motor neurons. Motor neuron cell bodies are located in the ventral horn of the gray matter.

**Hint:** Recall the distinction between sensory and motor neurons and their respective locations.

### Conclusion:
The only correct statement regarding the spinal cord is the third one: "Its white matter consists chiefly of long myelinated nerve fibers."