BIO 365S Lecture Notes - Lecture 8: Central Nervous System, Posterior Grey Column, Somatic Nervous System

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16 May 2018
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Divisions of the
Nervous System
• Cetral Nerous Syste CNS
• Brai
• Spial ord
• Peripheral Nerous Syste PNS
• Craial eres  pairs
• Spial eres
Most of PNS originate from brain stem.
CNS
Brain and spinal cord never physically touch the outside world. All
based on sensory division (sensors) = transfer visual stimulus into the
language your brain understands (only undersands action potential).
Brain can control the somatic nervous system, but a’t otrol
autonomic nervous system because most of the time brain does this for
you.
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Spinal Cord
Gray matters: soma
white matter: tracks
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Function: reflex.
Nerve: combo of motor and sensory nerves, reaches spinal cord, sensor
will say you touched something hot and will go through the dorsal part
of your back. Inside spinal cord, connects dorsal and ventral horn (has
motor neuron), go out through ventral root, combine with sensory, and
control skeletal muscle. Inside, the doral and ventral horn look gray
because cell body, on the outside looks white because myelinated.
Functions of the spinal cord:
Reflex and signal transduction
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Document Summary

Nervous system: ce(cid:374)tral ner(cid:448)ous syste(cid:373) (cid:894)cns(cid:895, brai(cid:374, spi(cid:374)al (cid:272)ord, peripheral ner(cid:448)ous syste(cid:373) (cid:894)pns(cid:895, cra(cid:374)ial (cid:374)er(cid:448)es (cid:894)(cid:1005)(cid:1006) pairs(cid:895, spi(cid:374)al (cid:374)er(cid:448)es. Brain and spinal cord never physically touch the outside world. All based on sensory division (sensors) = transfer visual stimulus into the language your brain understands (only undersands action potential). Brain can control the somatic nervous system, but (cid:272)a(cid:374)"t (cid:272)o(cid:374)trol autonomic nervous system because most of the time brain does this for you. Nerve: combo of motor and sensory nerves, reaches spinal cord, sensor will say you touched something hot and will go through the dorsal part of your back. Inside spinal cord, connects dorsal and ventral horn (has motor neuron), go out through ventral root, combine with sensory, and control skeletal muscle. Inside, the doral and ventral horn look gray because cell body, on the outside looks white because myelinated.

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