Med-Source Anatomy — Nervous System Overview http://med-source.blogspot.com/

parasympathetic (rest & digest)

CNS (brain & spinal cord)

PNS(12 pairs of cranial nerves & 31 pairs

of spinal nerves: 8C, 12T, 5L, 5S, 1CC )

somatic NS (voluntary)

o skeletal muscle o 1 neuron pathway

(CNS target)

autonomic NS (involuntary)

o smooth muscle o glands o cardiac muscle

CNS T1 — L2/3

ventral roots

ventral & dorsal rami

white rami

paravertebral trunk ganglia

prevertebral trunk ganglia

splachnic nerves

body wall

T1 — T4

viscera superior to diaphragm

cardiopulmonary splachnic nerves

greater / lesser / least & lumbar

splachnic nerves

T5 — L2

viscera inferior to diaphragm

CNS vagus* & S2 — S4

* & other cranial nerves

viscera

organ

2 neuron pathways (CNS ganglion target)

gray rami

all 1 1

2

22

1

2

sympathetic(fight or flight)