1. 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?)

2. Central Nervous System (CNS)
Brain and Spinal Cord
“Command Central”
PNS (Peripheral Nervous System) are nerves that go out to targets in body

3. Coronal Section Cartoon
Brain
Cranial Cavity of Skull
Spinal Cord
Vertebral Arches
Cranial Nerves I-XII (off brain)
Spinal Nerves
C--8 prs (L,R)
T--12 prs
L--5 prs
S--5 prs

4. Counting Body Segments (vertebrae versus nerves)
Why are there seven cervical vertebrae but eight cervical nerves?

5. Transverse View (x-section)
vertebral body
vertebral arch
vertebral foramen
spinal cord

6. Sagittal View vetebral body, arch intervertebral disc spinal cord
spinal nerves (where?)

7. Zebra-Man
Dermatomes
Each is sensory area of one spinal nerve

8. Peripheral Nervous System (PNS)
All nerves that leave the CNS
Two Modalities:
Sensory/Afferent
(info. In)
Motor/Efferent
(commands out)
Somatic
Visceral/Autonomic
(hint: SAME)
Somatic
Visceral/Autonomic
--smooth mm.
--heart
--glands
Parasympathetic
Sympathetic

9. Somatic Motor Neuron
(PNS)
(CNS)

10. Sensory Neuron
(PNS)
(CNS)

11. Visceral (Autonomic) Motor Neuron
(PNS)
(CNS)

12. Segmental Spinal nerve (more in Nervous System II)

13. Autonomic “Targets”
All have dual sympathetic and parasympathetic innervation
(more in N.S.II)