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NERVOUS SYSTEM I - LarryFrolich.com

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NERVOUS SYSTEM I
CNS (Central Nervous System)
Segmentation
PNS (Peripheral Nervous System)
Spinal Nerves
Neuron Types
Autonomic Nervous System
(how many nervous systems are there anyways?)
Human Anatomy, Larry M. Frolich, Ph.D.
Central Nervous System (CNS)
Brain and Spinal Cord
“Command Central”
PNS (Peripheral
Nervous System) are
nerves that go out to
targets in body
Human Anatomy, Larry M. Frolich, Ph.D.
Coronal Section Cartoon
Brain
Cranial Cavity of Skull
Spinal Cord
Vertebral Arches
Cranial Nerves I-XII (off brain)
Spinal Nerves
пЃ®
пЃ®
пЃ®
пЃ®
C--8 prs (L,R)
T--12 prs
L--5 prs
S--5 prs
Human Anatomy, Larry M. Frolich, Ph.D.
Counting Body Segments
(vertebrae versus nerves)
Why are there
seven cervical
vertebrae but
eight cervical
nerves?
Human Anatomy, Larry M. Frolich, Ph.D.
Transverse View (x-section)
vertebral body
vertebral arch
vertebral
foramen
spinal cord
Human Anatomy, Larry M. Frolich, Ph.D.
Sagittal View
vetebral body,
arch
intervertebral
disc
spinal cord
spinal nerves
(where?)
Human Anatomy, Larry M. Frolich, Ph.D.
Zebra-Man
Dermatomes
Each is
sensory area
of one spinal
nerve
Human Anatomy, Larry M. Frolich, Ph.D.
Peripheral Nervous System (PNS)
Sensory/Afferent
(info. In)
Motor/Efferent
(commands out)
Somatic
Visceral/Autonomic
Somatic
Visceral/Autonomic
--smooth mm.
--heart
--glands
Parasympathetic
Sympathetic
(hint: SAME)
All nerves that leave the CNS
Two Modalities:
Human Anatomy, Larry M. Frolich, Ph.D.
Somatic Motor Neuron
(CNS)
(PNS)
Human Anatomy, Larry M. Frolich, Ph.D.
Sensory Neuron
(CNS)
(PNS)
Human Anatomy, Larry M. Frolich, Ph.D.
Visceral (Autonomic) Motor Neuron
(CNS)
(PNS)
Human Anatomy, Larry M. Frolich, Ph.D.
Segmental Spinal nerve
(more in Nervous System II)
Human Anatomy, Larry M. Frolich, Ph.D.
Autonomic
“Targets”
All have dual
sympathetic and
parasympathetic
innervation
(more in N.S.II)
Human Anatomy, Larry M. Frolich, Ph.D.
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