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Transcript of Nervous Tissue
Nerves Types and Functions of Nervous Tissue Sensory(Afferent)-transmits nerve impulses to spinal cord or brain
Motor(Efferent)- neurons transmit nerve impulses away from the brain or spinal cord to or toward muscles or glands
Interneurons- conduct impulses from sensory neurons to or towards motor neurons Nucleus Cell Body Axon Dendrites Axon Hillock Structural Classification of Neurons Multipolar (most numerous; Brain and Spinal Cord neurons)
-Several dendrites Neuron Bipolar (least numerous; Eye Retina, Inner Ear, Olfactory Pathway)
- one axon
- one highly branched dendrite Unipolar
- single process extending from cell body
- branches to form a central process and a peripheral process
- always sensory neurons conducting information toward central nervous system Nervous Systems Central Nervous System(CNS)
- the structural and functional center of the entire nervous system
- connects to spinal cord and brain
-integrates incoming pieces of sensory information and evaluates the situation and initiates the response Peripheral Nervous System(PNS)
- consists of the nerve tissues that lie in the extending regions of the nervous system Neuron- nervous cell
Axon- transmits nerve impulses away from the cell body
Dendrites- carry nerve signals toward the axon
Axon Hillock- gathers all response information and determines which to send down the Axon Schawnn Cells and Myelin Sheath Schawnn Cells support nerve fibers and can form a myelin sheath around them
Myelin Sheath is formed by layers of Schawnn cell membrane containing the white, fatty substance Myelin
Myelin Sheath conducts flow of reactions Reflexive Arc arrangement of neurons that is a signal conduction route to and from the central nervous system(brain, spinal cord) By: Anthony King
Carrie Miller (pg. 145-146, 343-353) (pg. 135) (pg. 349) (pg. 350) (pg. 343-344) (pg. 347) (pg. 350) Damage and Disorders Damage:
neurons are incapable of cell division, can result in permanent cell damage
only option for healing- repair present neurons Disorders:
disease of central nervous system
effects- nerves impaired, loss of coordination, visual impairment, speech disturbances
no known cure (pg. 347,352) Afferent Efferent Interneurons