Transcript Nervous System Anatomy

Nervous System Anatomy
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Structural Classification
Central nervous system (CNS)
Brain and spinal cord
Peripheral Nervous System (PNS)
Spinal and cranial nerves
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Functional classification
Afferent
Sensory nerves
Efferent
Motor nerves
If a person is a quadriplegic which
part of their nervous system is
damaged?
80%
CNS
PNS
SOS
NNS
20%
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Motor Nerves
Somatic System
Voluntary
• Most skeletal muscle fibers
Autonomic system
Involuntary
• Sympathetic- “fight or flight”
Parasympathetic- body at rest
Neurons
Cell body
Metabolic center
Axon
Long fiber that conducts nerve impulses away
from cb
Dendrite
Short fibers conducting impulses to cb
Myelin Sheath
Schwann cells with gaps between
Impulse travels along sheath
What is the function of the cell body ?
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carries impulse
sends impulse
metabolic center
I don’t know
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Nerve cells are called
88%
neurons
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neurocytes
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Sensory Neurons
Afferent
Neurons carrying impulse from sensory
receptors to the CNS
Cutaneous receptors
• Skin
Proprioceptors
• Muscles and tendons
Motor
Efferent
Neurons carrying impulse from CNS to
muscles and glands