**Question:** Which is not a part of lower motor neuron:

A. Motor neuron
B. Motor neuron's axon
C. Motor neuron's soma
D. Motor neuron's dendrites

**Core Concept:** Lower motor neurons (LMNs) are a part of the peripheral nervous system (PNS) and are responsible for controlling skeletal muscle contraction. They consist of:

1. Motor neuron (LMN cell body)
2. Motor neuron's axon
3. Motor neuron's dendrites

**Why the Correct Answer is Right:** Dendrites are the branching extensions of a neuron that receive signals from other neurons or sensory receptors. They are involved in the integration of signals and do not directly control muscle contraction.

**Why Each Wrong Option is Incorrect:**

A. Motor neuron is a correct part of the lower motor neuron, as it is the cell body that receives sensory information and initiates the signal for muscle contraction.
B. Motor neuron's axon is also correct, as it transmits the signal from the motor neuron to the muscle fiber, causing contraction.
C. Motor neuron's dendrites are incorrect, as explained earlier - dendrites receive signals and integrate them, not control muscle contraction.

**Why Option D is Incorrect:** Dendrites are not part of the lower motor neuron. They are involved in signal integration, while the lower motor neuron primarily focuses on transmitting signals to control muscle contraction.

**Clinical Pearl:** Understanding the role of each component of the lower motor neuron is crucial for understanding muscle function and disorders like motor neuron diseases.

**Correct Answer:** D. Motor neuron's dendrites (Option D) is not a part of the lower motor neuron.