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# Motor Neuron The image displays a diagram of a motor neuron, including its components and a photomicrograph. ## (a) Presynaptic Neuron * **Synaptic knobs:** Structures at the end of the neuron's axon. * **Terminal extensions:** Prolongations extending from the synaptic knobs. * **Dendrites:**...

# Motor Neuron The image displays a diagram of a motor neuron, including its components and a photomicrograph. ## (a) Presynaptic Neuron * **Synaptic knobs:** Structures at the end of the neuron's axon. * **Terminal extensions:** Prolongations extending from the synaptic knobs. * **Dendrites:** Tree-like structures that receive signals from other neurons. * **Cell body:** The central part of the neuron, containing the nucleus. * **Chromatophilic substance:** Granular material in the cell body. * **Axon hillock:** A cone-shaped region connecting the cell body to the axon. * **Axon:** A long, slender projection that transmits signals away from the cell body. * **Axon collateral:** Branching from the axon. * **Axon (wrapped in the myelin sheath):** The axon covered by myelin. ## (b) Postsynaptic Neuron * **Myelin sheath:** A fatty layer that surrounds the axon. * **Terminal extensions:** Prolongations from the axon. * **Synaptic knobs:** Structures at the ends of the terminal extensions. ## (c) Synapse * **Synaptic knob:** Part of the presynaptic neuron, containing synaptic vesicles. * **Synaptic vesicles:** Membrane-bound sacs containing neurotransmitters. * **Neurotransmitter:** Chemical messengers released into the synaptic cleft. * **Synaptic cleft:** The space between the presynaptic and postsynaptic neurons. * **Postsynaptic neuron:** The neuron receiving the signal. * **Receptor:** A protein that binds to the neurotransmitter. ## (d) Photomicrograph of a Motor Neuron * **Chromatophilic substance:** Granular material visible in the cell body. * **Cytoskeleton:** The structural framework inside the neuron. * **Dendrite:** Branching extensions from the neuron body. * **Nucleolus:** Small structure found within the nucleus of a cell. * **Nucleus:** Structure containing genetic material in the cell body. * **Cell Body:** Main portion of the neuron. * **Axon hillock:** The junction between the cell body and the axon. * **Nucleus of glial cell:** Nucleus of a supporting cell. * **Axon:** The long, slender projection carrying signals. The image shows a motor neuron and a microscopic view of a neuron. It labels different sections of the neuron with explanations.