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Nervous System
Nervous System Organization, Glial cells, Structure of a Neuron
| Term | Definition |
|---|---|
| Central Nervous System | Includes the brain and spinal cord. |
| Peripheral Nervous System | Includes spinal nerves to carry impulses to and from the spinal cord and cranial nerves to carry impulses to and from the brain. |
| Sensory (afferent) Division | Includes somatic sensory fibers and visceral sensory fibers. |
| Motor (efferent) Division | Carries impulses from the CNS to organs, muscles and glands. |
| Sense Organs | Skin, skeletal muscles, joints, and organs. |
| Somatic Division | Voluntarily controlled like skeletal muscles. |
| Autonomic Division | Involuntarily controlled like the heart muscle. |
| Parasympathetic Division | Referred to as the "Resting and Digesting" system. |
| Sympathetic Division | Referred to as the "Fight or Flight" system |
| Astrocyte | *Abundant, star shaped. |
| Microglial cell | *Spider-like phagocyte. |
| Ependymal cells | *Lines the cavity of the brain and spinal cord. |
| Oligodendrocytes | *Produces fatty insulating coverings called myelin sheaths. |
| Satellite cells | *Act as protective, cushioning cells. |
| Schwann cells | *Form myelin sheaths around nerve fibers. |
| Nucleus | Control center of the cell body of the neuron. |
| Mitochondrion | The energy providing organelle. |
| Dendrite | convey incoming messages toward the cell body. |
| Cell body | Part of the neuron that contains organelles surrounded by cytoplasm. |
| Nissl substance | Rough endoplasmic reticulum |
| Axon hillock | Cone like region |
| Neurofibrils | Sometimes called the "neuron husk". |
| Axon | carry messages away from the cell body. |
| Collateral branch | An occasional protrusion along an axon. |
| Node of Ranvier | Gaps formed from the individual Schwann cells |
| Axon terminal | End of the axon |