ANAT-A 225, Lab, Peripheral nervous system (PNS)

olfactory nerve

- sensory, smell

trigeminal nerve

- both, m: muscles of mastication, s: face (pain, temperature, touch)

abducens nerve

- motor, lateral rectus (LR)

facial nerve

- both, m: muscles of facial expression, s: tears, salivary glands, taste (anterior 2/3 of tongue)

vestibulocochlear nerve

- sensory, hearing

vagus nerve

- both, m: larynx/pharynx muscles, s: sensory to organs in thoracic and abdominal

accessory nerve

- motor, sternocleidomastoid and trapezius

hypoglossal nerve

- motor, tongue muscles

12 pairs of cranial nerves

- arise from brain and/or brainstem

optic nerve

- sensory, vision

oculomotor nerve

- motor, all extrinsic eye except LR/SO

trochlear nerve

- motor, superior oblique (SO)

glossopharyngeal nerve

- both, m: stylopharyngeus, s: taste (posterior 1/3 of tongue)

how many pairs of spinal nerves are there?

- 31 pairs

how many cervical spinal nerves are there?

- 8 cervical

how many thoracic spinal nerves are there?

- 12 thoracic

how many lumbar spinal nerves are there?

- 5 lumbar

how many sacral spinal nerves are there?

- 5 sacral

how many coccygeal spinal nerves are there?

- 1 coccygeal

what is a plexus?

- a network of nerves
- paired areas of interchange
- multiple: plexuses

cervical plexus

- phrenic nerve to diaphragm

phrenic nerve

- lateral to vagus nerve
- motor innervation to diaphragm

brachial plexus

- supplies the upper extremity
- made up of axillary, radial, musculocutaneous, ulnar, and median nerves
- donor: radial, musculocutaneous, ulnar, median nerves

lumbosacral plexus

- supply lower extremity
- includes: lumbar plexus and sacral plexus
- donor: femoral nerve (anterior thigh), sciatic nerve (posterior hip and thigh), splits into tibial nerve, common fibular nerve