peripheral NS

nerve plexus

nerve network made of afferent and efferent fibers

nerve plexuses function

muscle movement, coordination, and responses to pain, heat and pressure

cervical plexus 

head, neck, and shoulders 

brachial plexus 

chest, shoulders, arms and hands 

lumbar plexus

back, abdomen, groin, thighs, knees and calves

sacral plexus

pelvis, buttocks, genitals, thighs, calves and feet

cranial nerves emerge

directly from the brain

cranial nerves control

head, neck and special senses 

1. olfactory nerve 

smell (sensory)

2. optic nerve 

vision (sensory)

3. oculomotor nerve

eye movement, eyelid opening, pupil constriction, lens focusing (motor)

4. trochlear nerve 

eye movement using the superior oblique muscle (motor)

5. trigeminal nerve 

facial sensation and chewing (mixed)

6. abducens nerve 

eye movement using the lateral rectus muscle (motor)

7. facial nerve 

taste (front 2/3 tongue), facial expression, saliva, tears (mixed)

8. vestibulocochlear nerve 

hearing and balance (sensory)

9. glossopharyngeal nerve

taste (back ½ tongue), swallowing, saliva, blood pressure regulation (mixed)

10. vagus nerve 

taste (throat), swallowing, speech, slows heart, stimulates digestion (mixed)

11. accessory nerve 

swallowing, head, neck and shoulder movements (motor)

12. hypoglossal nerve

tongue movement for speech and swallowing (motor)

two divisions of automatic NS

parasympathetic and sympathetic NS

parasympathetic NS

REST and DIGEST

sympathetic NS

FIGHT or FLIGHT