CH.9 Nervous System Flashcards
Describe the organization of the nervous system and explain the functions of its principal components.
CNS
- brain and spinal cord
PNS
- afferent system
- efferent system
- somatic system
- autonomic system
- sympathetic system
- parasympathetic system
what system controls voluntary movements
somatic
what does the autonomic system control
involuntary movements
organs
what nerves carry electrical impulses from receptors in the body to the central nervous system
afferent (sensory)
what nerves carry electrical impulses from the central nervous system to muscles and glands
efferent (Somatic and Autonomic)
Describe the structure of neurons
contain axons, dendrites, cell body, trigger zone, and axon terminal
can be multi- bi- or unipolar
Describe the structure of neuralgia
The “glue” between neurons
Supporting and insulating cells between neurons
Segregate and insulate neurons
Promote health and growth
Five to ten times more numerous than neurons
Several different types found in the body
Describe the structure of myelin sheath
formed by neuroglia around axons
speed up impulses
what is a cluster of cell bodies called outside CNS
ganglion
what are a group of axons called outside CNS
nerve
What are a group of cell bodies inside CNS called
grey matter
what is a collection of axons inside the CNS called
tract
what is a group of tracts called inside the CNS, and why
white matter, myelin sheath
function of spinal cord
carry impulses and integrating reflexes
How many spinal nerves are their
31
