Question

Match the names of the supporting cells found in column B with the appropriate descriptions in column A....


Match the names of the supporting cells found in column B with the appropriate descriptions in column A.

Transcribed: . Match the names of the supporting cells found in column B with the appropriate descriptions in column A. Column A Column B (1) myelinates nerve fibers| in the CNS (2) lines brain cavities (a) astrocyte (b) ependymal cell (c) microglial cell
Transcribed: (3) myelinates nerve fibers in the PNS (4) CNS phagocyte (5) helps regulate the ionic composition of CNS extracellular fluid (d) oligodendrocyte (e) satellite cell (f) Schwann cell

Answer

There are two divisions of the nervous system. The central nervous system includes the brain and the spinal cord, the peripheral nervous system consists of nerve fibres which carry information between the central system and other body parts. The peripheral nervous system is in turn divided into afferent and efferent nervous systems.

Nerve cells and the neuroglia make up the nervous tissue. Neurons or nerve cells consist of a cell body, axon and dendrites. On receiving a stimulus the neurons convert it into electrical signals which are known as nerve impulses or action potential. In this way neurons conduct nerve impulses. Neuroglia provides support to the nervous tissue.

Non neuronal cells which cannot trigger an action potential are the glial cells.

Ependymal cells, astrocytes, oligodendrocytes, and microglia are the neuroglia of the central nervous system. The immune cells of the brain, microglia protects it against injury and diseases. Astrocytes are star shaped macroglial cells which control the neurotransmitter levels, concentration of ions and provide metabolic support. Oligodendrocytes provides axonal support and forms the myelin sheath around the neurons in the central nervous system. The cells which line the spinal cord and the brain are the ependymal cells. They produce cerebrospinal fluid. Schwann cells form the myelin sheath around the neurons in the peripheral nervous system. The neurons in the sensory, sympathetic and parasympathetic ganglia are surrounded by the satellite cells which regulate the chemical environment.

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