Spinal cord and Spinal Nerves Flashcards
ganglia
where synapses occur; cluster of cell bodies in the PNS
the dorsal side of the spinal cord integrates… info
sensory
the ventral side of the spinal cord integrates… info
motor
Are motor neurons efferent or afferent
efferent
Are sensory neurons afferent or efferent
afferent
Grey matter vs white matter
grey matter= unmyelinated; consists of sensory and motor nuclei; lots of synapses
white matter: consists of axons carrying information to and from the brain
If the dorsal root nerve of a spinal nerve is severed
sensory input would be blocked
the dorsal ramus sends _______ info where
sensory and motor info to the back of the body
the ventral ramus send ____ info where
sensory and motor info to the other parts of the body besides the back (the front, side, limbs, etc)
what if the dorsal ramus of a spinal nerve is severed?
both sensory and motor information from the back would be blocked
How many pairs of cranials nerves are there
12 pairs
Cranial Nerve I
Olfactory; smell
sensory only
Cranial Nerve II
Optic nerve; vision
sensory only
Cranial Nerve III
Oculomotor: moves 4 out of 6 eye muscles; controls pupil size; eye shape
Cranial Nerve IV
Trochlear: moves one eye muscle
motor
Cranial Nerve V
trigeminal; pain, temp, touch, chewing; opthalamic, maxillary, and mandibular nerves; Greatest sensory function; skin dermatome
sensory and motor
Cranial Nerve VI
abducens; motor, one of the eye muscles
Cranial nerve VII
facial; sensory, motor and parasympathetic
facial expression, taste, control of salivary glands, and tears
Cranial Nerve VIII
vestibulocochlear; sensory
hearing and balance
Cranial Nerve IX
glossopharyngeal
sensory, motor, and parasympathetic
general taste sensation posterior 1/3 of the tongue, blood pH and gasses, swallowing, salivary gland
cranial nerve X
vagal nerve; sensory, motor, and parasympathetic
swallowing, speaking, visceral sensory and motor
XI
motor only; innervates trapezuis and sternocleidomastoid- helps us strug our shoulders
Cranial Nerve XII
hypoglossal; motor only; movement of the tongue
