HUMB1000 Lecture Notes - Lecture 8: Central Nervous System, Axon Terminal, Microglia

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C8 L1 Intro to the Nervous System:
Functions:
- Maintaining homeostasis
- Receives sensory input
oInternal (subconscious ie. Digestion of food)
oExternal (conscious ie. Touch a hot stove)
- Integrating information
- Motor output
- Establish and maintain mental activity
Structural Divisions:
- Central nervous system (brain and spinal cord)
- Peripheral nervous system (spinal nerves (31 pairs) and cranial nerves (12 pairs))
Functional Divisions:
PNS divided into:
- Autonomic nervous system  motor  sympathetic and parasympathetic
- Somatic nervous system
- Enteric nervous system (digestion)
All have motor (efferent) and sensory (afferent) divisions
Autonomic nervous system:
- Involuntary and under subconscious control
- Action potentials in the motor neurons travel from the CNS to smooth or cardiac muscle or
glands
- Two neuron system (2 neurons from CNS to effector organ)
- Cell bodies of the neurons are located in the CNS and autonomic ganglion
- Sympathetic: fight or flight: eg. Sweat glands, dilation of pupils, constriction of blood vessels
- Parasympathetic: rest or digest: eg. Release of saliva, digestion of food, urination
Somatic nervous system:
- Voluntary and under conscious control
- Action potentials in the motor neurons travel from the CNS to skeletal muscles
- Single neuron system
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Document Summary

C8 l1 intro to the nervous system: Receives sensory input: internal (subconscious ie. digestion of food, external (conscious ie. touch a hot stove) Peripheral nervous system (spinal nerves (31 pairs) and cranial nerves (12 pairs)) Autonomic nervous system motor sympathetic and parasympathetic. All have motor (efferent) and sensory (afferent) divisions. Action potentials in the motor neurons travel from the cns to smooth or cardiac muscle or glands. Two neuron system (2 neurons from cns to effector organ) Cell bodies of the neurons are located in the cns and autonomic ganglion. Sympathetic: fight or flight: eg. sweat glands, dilation of pupils, constriction of blood vessels. Parasympathetic: rest or digest: eg. release of saliva, digestion of food, urination. Action potentials in the motor neurons travel from the cns to skeletal muscles. Motor: send messages from cns to effector cells (ventral path) Sensory: send messages from effector cells to cns (dorsal path)

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