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Bio 385 Chapter 3 summary
Chapter 3 summary for Bio 385. *Essential!! *Contains vital information, key concepts and more... Enjoy!!
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Chapter 3Layout of Nervous System
CNS
o Division of nervous system located within skull and spine
o Brain = skull
o Spinal cord = spine
Peripheral NS
o Located outside skull and spine
o Somatic – interacts with external environment
Composed of afferent nerves, carry sensory signals from skin, skeletal
muscles, joints, ears, eyes, etc.
o Automatic – regulates internal environment
Afferent nerves carry signals from internal organs to CNS
Efferent nerves that carry motor signals from CNS to internal organs
Two kind of efferent nerves
Sympathetic – project from the CNS in lumbar (small of back) and
thoracic (chest area) regions of spinal cord
Parasympathetic – project from brain and sacral (lower back) to
spinal cord
Cells of the Nervous System
Anatomy of Neurons
Neurons – cells responsible for reception, conduction, and transmission of
electrochemical signals
External Features
o Cell membrane
o Dendrites
o Axon hillock
o Axon
o Nodes of Ranvier
o Buttons
o Synapses
o Cell body
o Myelin
Internal features
o Endoplasmic reticulum
o Nucleus
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