nervous system

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

Somatic Visceral/Autonomic
Sensory/Afferent (info. In) Motor/Efferent (comma
nds out)
(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)