NERVOUS TISSUE

NERVOUS TISSUE - NERVOUS TISSUE NERVOUS TISSUE Nervous...

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12/13/12 NERVOUS TISSUE 1/3 lifesci.rutgers.edu/~babiarz/nervous.htm NERVOUS TISSUE Nervous tissue is the fourth basic tissue type of the body and is organized into two basic systems: (1) the Central Nervous System ( CNS ) and (2) the Peripheral Nervous System ( PNS ). The peripheral system responds to stimuli and sends impulses to the central system (brain and spinal cord). These impulses are interpreted by the CNS and then other impulses initiated in the CNS travel back through the PNS to effector organs to produce the proper response. The basic cell of the nervous system is called a neuron . Structurally, a neuron consists of: (1) the cell body , containing the nucleus and synthetic organelles; (2) the axon , a long cytoplasmic process associated with the cell body used to communicate with target organs; and (3) the dendrites , shorter cytoplasmic processes off the cell body used to communicate between neurons. Central Nervous System Spinal Cord The spinal cord is composed of grey and white matter ( Spinal Cord 1 ). The grey matter is composed of nerve cell bodies and in a cross-sectional cut appears as a darker stained "H"-like central area. The white matter , composed entirely of axonal projections, surrounds the grey matter and is lighter staining ( Spinal Cord 2 ). Brain Like the spinal cord, the brain is composed of areas of grey and white matter. In some areas an addition outer gray layer is present. We will study two regions of the brain, in which this additional grey matter has a distinct morphology.
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NERVOUS TISSUE - NERVOUS TISSUE NERVOUS TISSUE Nervous...

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