nervous tissues and neuron compositions lecture one

central nervous system

brain, spinal cord

peripheral nervous system

spinal nerves, cranial nerves, ganglia

ganglion

a group of neuron cell bodies outside of the CNS

sensory and motor ganglias

sensory division

receives information from the body and sends it to cns for processing

cns & pns

somatic and visceral

somatic sensory

receives sensory info from skin, joints, muscle, and special senses

visceral sensory

receives info from blood vessels and viscera

motor division

transmits info from cns to muscles and glands

cns & pns

somatic motor

innervates skeletal muscle (moves muscles)

autonomic motor

innervates smooth muscle, cardiac muscle, and the glands of the viscera

sympathetic and parasympathetic

neurons

respond to stimuli and conduct nerve impulses; amitotic

ganglions

supports and protects neurons; divides by mitosis

cell bodies

neurons 'control center'

nucleus

houses dna & contains nucleolus

chromatophilic substance (rough er)

protein synthesis

dendrites

receive input & send nerve impulses to cell body

axon

long nerve cell processes, sends outgoing nerve impulses

axon hillock

portion of the cell body from where axon originates

synapse

site of neuronal communication and terminates axons

axons can communicate with

neurons, muscle cells, or gland cells