Peripheral Nerves

Motor nerves

efferent; carry info away from the CNS

Sensory nerves

afferent; carry info to the CNS

Somatic

• voluntary

• single motor neuron

• innervate skeletal muscle, skin and their derivatives

Visceral (autonomic)

• involuntary

• two motor neurons

  • preganglionic

  • postganglionic

• innervate viscera - involuntary structures and glands

Ganglion

swollen area of nerve bodies outside the CNS

Which autonomic division has thoracolumbar outflow?

sympathetic

Which autonomic division has cranioscaral outflow?

parasympathetic

Myenteric plexus

nerve network within the muscular wall of the gut

Parasympathetic can be described as _____ and uses _____ as its neurotransmitter

cholinergic; acetylcholine

Sympathetic can be described as _____ and uses ______ as its neurotransmitter

adrenergic; norepinephrine

brachial plexus

brachial plexus

1. radial nerve

2. median nerve

3. ulnar nerve

1. femoral nerve

2. saphenous nerve

1. saphenous nerve

2. femoral nerve

3. obturator nerve

1. obturator nerve

2. saphenous nerve

3. femoral nerve

1. ischiatic (sciatic) nerve

2. tibial nerve

3. common peroneal nerve

black arrow

hypoglossal nerve (cranial nerve 12)

top arrow: hypoglossal nerve (cranial nerve 12)

bottom arrow: nodose and cranial cervical ganglia

top arrow: hypoglossal nerve (cranial nerve 12)

middle arrow: nodose and cranial cervical ganglia

bottom arrow: vagus nerve (cranial nerve 10) and sympathetic trunk

phrenic nerves

sympathetic trunk

1. dorsal root

2. dorsal root ganglion

3. ventral root

4. sympathetic chain

5. spinal nerve

1. white matter

2. gray matter

1. sympathetic division (can tell b/c thoracolumbar outflow)

2. sympathetic trunk (paravertebral)

3. coeliac ganglion (also see mesenteric ganglion directly below this)

4. prevertebral ganglia/collateral ganglia

5. parasympathetic division (can tell b/c craniosacral outflow)

Parasympathetic division has ____ preganglionic fibers and ______ postganglionic fibers.

long ; short

Sympathetic division has _______ preganglionic fibers and _______ postganglionic fibers.

short ; long

Sensory nerves enter the spinal cord on the ____ root.

dorsal

Motor nerves leave the spinal cord on the ____ root.

ventral