Has active protein synthesis function

Synthesize the cell's own structural proteins, enzymes, neurotransmitters, and peptide neuromodulators

cell membrane excitable membrane

The nucleus is centered, large and round, the nuclear membrane is obvious, and the coloring is light.

Cytoplasm contains

Preprojection components: presynaptic expansion (synaptic vesicles, mitochondria), presynaptic membrane (containing potential-gated channels)

Synaptic cleft:15-30um

Post-synaptic component: contains receptors chemically gated channels

Myelin: The membrane of Schwann cells repeatedly wraps around the axon in concentric circles

Ingredients: Lipids and proteins

Function: insulation protection

Myelin sheath: formed by oligodendrocyte processes that wrap around axons

Structure: central axon surrounded by myelin sheath

dendritic terminals exposed

Distributed in epithelial cells such as epidermis, cornea, mucosa, periosteum, meninges, and dental pulp

Feel sensations such as hot and cold, light touch and pain

Oval-shaped dermal papillae distributed in the skin, lips, fingertips

Feel the stress stimulus and participate in the production of touch

Distributed in subcutaneous tissue, peritoneum, mesenteric ligament, joint capsule

Involved in producing vibration and pressure sensations

Sense the stretching changes of muscle fibers and regulate the activity of skeletal muscles. Proprioceptors