NERVOUS SYSTEM I CNS (Central Nervous System) Segmentation

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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?)

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

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

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

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

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

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

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

Somatic Motor Neuron (PNS) (CNS)

Sensory Neuron (PNS) (CNS)

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

Segmental Spinal nerve (more in Nervous System II)

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

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