Select the correct statement regarding spinal cord.
1) it has butterfly shaped gray matter which is present outside white matter
2) It extends from medulla oblongata upto last coccygeal vertebra
3) Its white matter consists chiefly of long, myelinated nerve fibers
4)Dorsal root ganglia contain cell bodies of motor neurons

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 regarding the correct statement about the spinal cord, let's analyze each option step by step:

### Step 1: Analyze Option 1
**Statement**: It has butterfly-shaped gray matter which is present outside white matter.

- **Explanation**: The spinal cord has a butterfly-shaped gray matter structure, but it is located **inside** the white matter, not outside. Therefore, this statement is **incorrect**.

### Step 2: Analyze Option 2
**Statement**: It extends from medulla oblongata up to the last coccygeal vertebra.

- **Explanation**: The spinal cord begins at the base of the brain, specifically at the medulla oblongata, but it does **not** extend to the last coccygeal vertebra. Instead, it typically ends at the level of the first or second lumbar vertebra (L1 or L2). Thus, this statement is also **incorrect**.

### Step 3: Analyze Option 3
**Statement**: Its white matter consists chiefly of long, myelinated nerve fibers.

- **Explanation**: This statement is **correct**. The white matter of the spinal cord is primarily composed of long, myelinated nerve fibers, which are responsible for transmitting signals up and down the spinal cord.

### Step 4: Analyze Option 4
**Statement**: Dorsal root ganglia contain cell bodies of motor neurons.

- **Explanation**: This statement is **incorrect**. Dorsal root ganglia actually contain the cell bodies of sensory neurons, while the ventral root ganglia contain the cell bodies of motor neurons.

### Conclusion
After analyzing all the options, the only correct statement regarding the spinal cord is **Option 3**: "Its white matter consists chiefly of long, myelinated nerve fibers."

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