Peripheral Nervous System (PNS). PNS  Cranial nerves (12 pairs)  Spinal Nerves (31 pairs)

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Presentation transcript:

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  From brain/spine to effectors (muscles)

MIXED  Sensory and motor neurons.

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

SPINAL NERVES  COLOR CODE Cross section a-j.

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

REFLEX ARC  Response between PNS and spinal cord  Quick, involuntary response

MONOSYNAPTIC  One synapse  2 nerves = 1 sensory + 1 motor

Multisyanptic  MANY SYNAPSES  Multiple neurons