ch. 24 spine

CH. 24 SPINENerves

NERVOUS SYSTEM Central nervous

system Brain Spinal Cord

Peripheral nervous system All other nerves

NERVE Afferent or sensory

nerve: carries impulses from sense organs to the brain

Efferent or motor nerve: carries impulses from brain to muscles

If it does both, it is called a mixed nerve

CRANIAL NERVES I: Olfactory-Smell II: Optic-Vision,

eyesight III: Oculomotor-

movement of eye muscle

IV: Trochlear-Movement of eye muscle

CRANIAL NERVES V: Trigeminal-Face

and teeth muscles, chewing

VI: Abducens-Movement of eye muscle

VII: Facial-Facial expressions, taste

VIII: Vestibulocochlear-Hearing and balance

CRANIAL NERVES IX: Glossopharyngeal-

Movement of throat muscle, taste

X: Vagus-Movement of throat; heart/digestive system

XI: Accessory-Movement of neck muscles

XII: Hypoglossal-Movement of tongue muscles

REFLEXES Simplest nerve

response Reflex is

unconscious and involuntary

Caused by a stimulus Sound Light Heat Odor

DEEP TENDON REFLEXES Biceps Triceps Brachioradiolis Patella Tendon Achilles Tendon