part 4 Flashcards
somatosensory system
dominant sensory sytem (70%)
Fast input
self to supporting surface
relation of one limb/segment to another
components of somatosensory system
muscle spindle fibers (muscle length, rate of change)
Golgi tendons organs (monitor tension)
joint receptors (mechanorecptors)
cutaneous receptors
neural pathway
spinal cord- Dorsal horn
contralateral ( sides from L-R)
brainstem
thalamus
Parietal cortex (superior lower body, inferior upper body)
how do golgi receptors in tendons encode tension
same way as hair cells
Low spikes= low tension (low force)
high spikes= high tension (high force)
joint receptors
range of motion in joints percieved through integrated receptors in ligaments and joint capsules
Pacini receptors
dynamic sensitive to movement of joint capsule and ligaments during ROM
Ruffini receptors
static sensitive to position
visual system
10% info
reports information: self to supporting surface and head position
components of visual system
eyes, visual tract, thalamic nuclei, visual cortex
vertical eye movements are generated and controlled by
mid-brain
horizontal eye movements are generated and controlled by
pons
Extraocular muscles
6 total
superior and inferior oblique
superior, inferior, medial and lateral rectus
what muscles rotate eye in orbit
superior and inferior oblique
what muscles are innervated by CN III
superior inferior and, medial recti and inferior oblique
what is CN III
oculomotor nerve
