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Peripheral Nervous System (PNS)

Peripheral Nervous System (PNS). PNS. Cranial nerves (12 pairs) Spinal Nerves (31 pairs). Ganglia. Group of cell bodies in PNS. TYPES OF NERVES. SENSORY. Towards CNS, Afferent nerve. (From receptors towards brain/spine). MOTOR. AWAY FROM CNS, efferent nerve

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Peripheral Nervous System (PNS)

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  1. Peripheral Nervous System (PNS)

  2. PNS • Cranial nerves (12 pairs) • Spinal Nerves (31 pairs)

  3. Ganglia • Group of cell bodies in PNS.

  4. TYPES OF NERVES

  5. SENSORY • Towards CNS, Afferent nerve. • (From receptors towards brain/spine)

  6. MOTOR • AWAY FROM CNS, efferent nerve • From brain/spine to effectors (muscles)

  7. MIXED • Sensory and motor neurons.

  8. SPINAL NERVES • 31 pairs. All mixed out of spinal cord, branches come out through holes in vertebrate.

  9. SPINAL NERVES • COLOR CODE Cross section a-j.

  10. Page 238 • A. Spine • B. Gray Matter • C. White Matter • D. Spinal Nerve • E. Dorsal Root • G. Dorsal Root ganglion • J. Ventral Root.

  11. REFLEX ARC • Response between PNS and spinal cord • Quick, involuntary response

  12. MONOSYNAPTIC • One synapse • 2 nerves = 1 sensory + 1 motor

  13. Multisyanptic • MANY SYNAPSES • Multiple neurons

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