L5 - motor systems Flashcards
components of the motor system
- cerebral cortex for voluntary movement- coordinates motor cortex and the sensory input
- descending motor pathways - has lateral and ventromedial pathways down the
spinal cord
-spinal cord - has motor neurons, sensory input and coordinates local refflexes
types of movement
reflex - protective
rhythimic motor patterns - combo of reflex and voluntary (chewing, walking )
- volunatry
one type of motor neuron in the spinal cord
lower alpha motor neurons
- they alone can control msucle contraction
spinal motorneuron actvitty is governed by what inputs
- sensory input - vis dorval root
- spinal interneurons for rhythimic movements
- upper motor neurons for initiation and control of voluntary movement
what can spinal cord circuits do
- they can coordinate the movements without the infleuces from the higher centres
what part of the msuculature is responsible for fine motor movement and what are they innervated by
- distal like hands, feet, legs
- innervated by lateral motor neurons
what input does the upper motor neurons need
from the brain
what part of the msuculature is responsible for posture movement and what are they innervated by
proximal - elbow, knees
axial - trunk muscles
- innervated by the medial motorneurons
pathways for distal muscles for fine motoro movement
lateral
pathway for proximal msucles for posture
ventromedial pathways
tracts in the lateral pathways
corticospinal and rubrospinal tracts
line for the corticospinal tract
from the cortex to the lateral spinal motor neurons
-location of the cell bodies of the motor neurons in the corticospinal
in the brain in
motor cortex (area 4 and 6)
projection line for rubrospinal
tracts of the ventromedial pathways and the origin of them
- pontine reticulo spinal
- meduallary reticulo spinal
vestibulo spinal
tecto spinal
- viewed as 2 pairs
- modulates spinal reflexes and maintain body body balance
function of pointine reticulo spinal tract
- facilitates the leg extensors to maintain the standing psoture
- enchanes the anti gravity reflexes to stand upright
function of medullary reiculto spinal tract
fress antigravity muscles from the reflex control
function of vestibulo psinal tract
- relays gravity info
function of tectspinal tract
relays sensory info from the retina and the visual cortex
what cortex is involved regarding the control of the vol movemnt
neocortex
motors areas in the brain
area 6 - supplementary motor area and premotor area
and 4 - primary motor cortex
function of primary motor cortex
control of distal musculature
function of premotoro coretx
control of proximal musculature, movement seq
-preparation for movement and initation
