APK 2105C Lecture 22: Neurons Part 1

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Chapter 7, Lecture 1
Neurons & Electrical Signaling
Overview of the nervous system
o Central NS
Brain
Spinal cord
o Peripheral NS
Afferent branch
Neural inputinformation going from body to brain
Sensory information
o Somatic senses
Body
Temperature
Pressure
Pain
o Special senses
Taste
Olfactory
Hearing
Vision
o Visceral senses
From internal organs
Efferent
Neural outputinformation coming from brain to stimulate
response
Motor system
Somatic
o Skeletal muscle
Autonomic
o Sympathetic
Cardiac muscle
Smooth muscle
Glands
o Parasympathetic
Enteric nervous system
GI tract
Cells of the nervous system
o Neurons
Have multiple processes
Electrical signaling types of cells
Cell body (soma)
Holds nucleus and majority of organelles
Dendrites = carry information towards soma
Cells can have multiple dendrites
Have single axonscarry information away from soma
Axon hillock
o Narrowing of soma as it goes into the axon
Axon terminal = small enlargement at the end of the axons
o Terminal boutons
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