SC Flashcards
where does the PCML cross over
medulla (to medial leminiscus)
Sensory ataxia
- Movement disorder associated with sensory impairment – not enough feedback coming back to brain to tell brain if motor signals sending out are correct
o Broad-based gait, gaze directed to feet (aid from visual system)
o Stamping action to max. conscious proprioception
Anterior STT
crude touch, pressure and vibration
Lateral STT
pain and temp sensations
Cervical dermatome
hand, arm, shoulder, neck
thoracic dermatome
abdominal, thoracic, trunk
lumbar dermatome
hips, thighs, feet, legs
sacral dermatome
part of legs (lateral) and genitals
white matter fnxn in SC
tracts propogate sensory impulses from receptors to brain, motor impulses from brain effectors
gray matter function
receives and integrates incoming/outgoing info
a log of reflexes happen at level of SC because of relays which happen in gray matter
posterior gray horn
sensory info
lateral gray horm
ANS, only exists at sc level which elicits sympathetic information
anterior gray horn
motor information
endoneurium
around each indv axon
perineurium
surrounds a fasicle (collection) of axons
epineurium
surrounding a collection of fasciles
PNS regeneration
often vigorous and complete and promote by SCHWANN CELLS
CNS
regeneration is uncommon and never complete
inhibited by oligo dendrocytes which secrete an inhibitory factor (glial scarring)
F. Cuneatus
more lateral and going to provide somatosensoryinfo for upper limbs
F. gracillis
more medial and going to provide info from the somatorsensory part of lower limbs
where does info cross over from PCML
at medulla n. cuneatus or n. gracillis and becomes medial leminiscus
function of PCML
- discriminitive touch
- concious proprioception
- provide image and body location
sensory ataxia
broad based gait, gaze directed at feet, stomping action to max concious proprioception
tests to test for sensory ataxia
rombergs sign
finger to nose
anterior STT
crude touch and pressure and vibrations
lateral STT
pain and temp sensations
UMN
regulate planning and initiation of movements
cortex or other brain areas
LMN
innervates skeletal muscles of the Body
cel l bodies in brain stem or SC
final neuron in pathway
lateral corticospinal tract
80-90% decussation at pyramids
anterior corticospinal tract
10% decussation at cervical or thoracic levels
