Lecture 9 Flashcards
what is motor equivalence
muscle action that is more abstract rather than one that is completed by a prescribed set of muscle activation…
can write name with hand, foot, teeth
main fn of ventromedial pathways
posture + balance
main fn of lateral pathways
skilled/fine movements
which pathway does NOT have subcortical origins (and where does it originate from)?
corticospinals
motor cortex
medial vestibulospinals project?
bilaterally
lateral vestibulospinals project?
ipsilaterally
reflexes of vestibulospinal
VCR
VOR
VSR
type of projections from reticulospinal
bilateral
which pathway is involved in postural adjustments for anticipated movements
reticulospinal
which system involved in postural adjustments for UNanticipated movements
vesitbuliar
proprioceptors
what does medial reticulospinal
excite?/excited by?
inhibit?/inhibited by?
excite: extensors + flexors
inhibited by: higher centers
what does lateral reticulospinal
excite?/excited by?
inhibit?/inhibited by?
excite: upper flexors
inhibit: ALL extensors
excited by: higher centers
colliculospinals travel in which direction to the cervical cord
contralateral
FN of colliculospinal
head orienting movements because superior colli activated
what do corticobulbars innervate
RF
RN
PN
CN ( no 3,4,6)
corticospinals innervate
RF RN BG VN PN
lateral cortices triggered by
external events
supplementary motor (medial) cortices triggered by
internal events
fn of vestibulospinal
posture + eye mvmts
use: axial, limb, eye muscles
fn of reticulospinal
posture + mvmts
use: proximal muslces
fn of tectospinal
head orienting mvmts
use: neck muscles
fn of ant corticospinal
posture + mvmt
use: axial + proximal muscles
fn of corticospinal
skilled mvmts
use: distal muscles
fn of rubrospinal
proximal arm flexors
rubrospinal ori
red nucleus
rubrospinal input?
BS + Cerebellum
where does rubrospinal decussate
ponds
which tract does rubrospinal join
corticospinal
where rubrospinal travel
lateral cord
what does rubrospinal innervate
(proximal) arm flexors
medial longitudinal vestibulospinal projects to? via?
CN 3,4,6 (VOR)
neck muscles
via: medial longitudinal fasiculus
lateral longitudinal vestibulospinal projects ot?
limb motor neurons
cerebellum
medial vestibulospinal comes from __ part of ear?
canals
lateral vestibulospinal comes from __ part of ear?
otolith organs
anterior corticospinals use ___ funiculus
ventromedial
lateral corticospinals use ___ funiculus
dorsolateral
where are corticospinals found/originate
caudal medullla
corticospinal composition
60- area 4 (primary motor cortex), 5% betz
30- area 6 (premotor)
10- somatosensory + cingulate cortex
supplementary motor (medial) cortices use?
ACC
BF inc in ___ during simple finger flexion
primary sensory and motor cortices
BF inc in ___ during sequential finger mvmts
medial motor cortices
BF inc in ___ during imaging finger flexion
medial motor cortices
lateral motor imagines or observes action?
observes
medial motor imagines or observes action?
imagines
where is lesion btwn in decerebrate rigidity?
pons and midbrain (mesencephalon)
where is lesion btwn in decorticate rigidity?
above red nuclei
