Pseudounipolar neurons occur in

Options

A. Pyramidal cells of cerebral cortex
B. Retina of eye
C. Schneiderian membrane
D. Cells of dorsal root ganglion

Answer

**Step-by-Step Solution:**

1. **Understanding Pseudounipolar Neurons**:
- Pseudounipolar neurons are a type of neuron characterized by having a single process that splits into two branches. The term "pseudo" means false, indicating that they appear to have one pole, but in reality, they have two functional branches.

2. **Identifying the Structure**:
- These neurons have a cell body from which a single axon extends. This axon then bifurcates into two parts: one part extends towards the periphery (sensory receptors), and the other part extends towards the central nervous system (CNS).

3. **Analyzing the Options**:
- **Option A: Pyramidal cell of the cerebral cortex**:
- Pyramidal cells are multipolar neurons, which means they have multiple dendrites and are not pseudounipolar. Thus, this option is incorrect.
- **Option B: Retina**:
- The neurons in the retina are typically bipolar neurons, which have two poles (one axon and one dendrite). Therefore, this option is also incorrect.
- **Option C: Membrane**:
- This option does not refer to a type of neuron and is irrelevant in this context. Hence, it is incorrect.
- **Option D: Cells of dorsal root ganglion**:
- Dorsal root ganglion cells are indeed pseudounipolar neurons. They are responsible for transmitting sensory information from the periphery to the CNS. This option is correct.

4. **Conclusion**:
- Based on the analysis of the options, the correct answer is that pseudounipolar neurons occur in the cells of the dorsal root ganglion.

**Final Answer**: Pseudounipolar neurons occur in the cells of the dorsal root ganglion.

---