Transcript 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
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