Tracts Flashcards
function pain and temp
lateral spinothalamic
function unconscious proprioception
posterior and anterior spinocerebellar
function discriminative touch (2 pt), vibration and conscious proprioception
dorsal columns (fasciculus cuneatus and gracilis)
function spino visual reflexes; aka spino-quadrigeminal system of Mott
spinotectal
function levels of conciousness
spinoreticular
function protopathic is defensive to pain, temp, crude light touch
anterior spinothalamic
ascending tracts (7)
lateral spinothalamic, anterior spinothalamic, dorsal columns (fasciculus cuneatus and gracilis), posterior and anterior spinocerebellar, spinotectal, spinoreticular
lateral spinothalamic pathway (3)
1st DRG
2nd substantia gelatinosa
3rd posterior lateral nucleus of thalamus –> postcentral gyrus
anterior spinothalamic pathway (3)
1st DRG
2nd substantia gelatinosa
3rd posterior lateral nucleus of thalamus –> postcentral gyrus
dorsal columns pathway (3)
1st DRG
2nd nuclei gracilis/cuneatus
3rd posterior lateral nucleus of thalamus –> postcentral gyrus
posterior spinocerebellar pathway (2)
1st DRG
2nd nucleus dorsalis (clarks column) ascend through inferior cerebellar peduncle to cerebellum
anterior spinocerebellar (2)
1st DRG
2nd nucleus dorsalis (clarks column) cross segmentally and ascend through superior cerebellar peduncle to cerebellum
spinotectal
1st DRG
2nd cross segmentally and ascend to superior colliculus (midbrain)
spinoreticular
1st DRG
2nd ascend to nuclei of reticular formation (brainstem)
fxn: precise and skilled voluntary movement “threading a needle or writing”
corticospinal (pyramidal) lateral and anterior
corticospinal (pyramidal) lateral and anterior origin and destination
o: 1st motor cortex, 2nd motor cortex, parietal lobe
d: internuncial neurons or alpha motor neurons
most cross at decussation of pyramids and descend as lateral corticospinal tracts, some continue as anterior corticospinal tracts
lateral corticospinal (length of cord) anterior (stops mid thoracic)
fxn: inhibit or facilitate voluntary movement
reticulospinal (pontine and medullary)
reticulospinal (pontine and medullary) origin and destination; crosses at various locations
o: reticular formation d: alpha and gamma motor neurons; cross at various locations
fxn: reflex postural movement to visual stimuli
tectospinal
tectospinal origin and destination
o: superior colliculus (midbrain) EYE d: alpha and gamma motor neuron EAR
fxn: facilitates flexors and inhibits extensors; received cerebellar and cerebral information
rubrospinal “red”
rubrospinal origin and destination
o: red nucleus (midbrain) d: alpha and gamma motor neurons
fxn: facilitates extensors and inhibits flexors; receives inner ear (via vestibular nerve) and cerebellar info
vestibulopinal
vestibulospinal origin and destination
o: lateral vestibular nucleus d: alpha and gamma motor neurons
+ path reflexes (babinski)
UMNL
increased muscle tone, spasticity, hypertrophy, clonus
UMNL
increased deep tendon reflex
UMNL
decreased superficial reflexes (bilateral)
UMNL
no path reflexes
LMNL
flaccidity, atrophy, fasciculations
LMNL
decreased deep tendon reflex
LMNL
decreased superficial reflexes (unilateral)
LMNL
