SPC Organization Flashcards
How many SPC segments?
31 (c8-t12-l5-s5-c1)
Where are preganglionic sympathetic neurons (lateral horn) located?
T1-L2
The biceps reflex tests the integrity of what cord segments?
C5-6
The triceps reflex tests the integrity of what cord segments?
C7-8
The knee-jerk reflex tests the integrity of what cord segments?
L3-4
The ankle-jerk reflex tests the integrity of what cord segments?
S1-2
Myotatic reflexes consist of how many neurons?
2 neurons (monosynaptic)
What is likely damaged in diminished deep tendon reflex? Exaggerated DTR?
Afferent / Efferent limb
UMN
The dorsal columns are ipsilateral or contralateral information?
Ipsilateral
The DCML ends in what thalamic nucleus?
VPL
Visceral pain is transmitted via _
The DCML
The Romberg test is an assessment of what pathway?
DCML (propioception)
Lissaur’s tract is _. How does this affect the location of a lesion?
A tract where 1st order spinothalamic neurons ascend before synapsing.
The signs are seen 1-2 levels below the lesion
Lesion of the spinal cord anterior commissure results in _? what is an example of this sort of lesion?
Bilateral loss of pain and temp
Syringomyelia
There are 3 spino-cerebellar tracts. They are _ and what are their functions?
Dorsal spinocerebellar (Lower limb) Cuneocerebella (Upper limb) Ventral spinocerebellar (GTO of lower limb)
All the spinocerebellar tracts are ipsilateral. Which one crosses twice?
Ventral spino-cerebellar tract
The hypothalamospinal pathway does what? What happens when it is damaged?
Autonomic control.
Horner’s syndrome
Disc herniation, spondylosis, tumors, dislocation and fluorosis can all cause _
Spinal stenosis
Disc herniation causes pain by _
What transmits this pain?
Activating nociceptors in the disc and vertebral periosteum.
Sympathetic afferents
When C6/7 herniation occur, what nerve is affected? What about L5/S1?
C7
S1
Lower seems to be affected
The dorsal columns of the SPC receieve blood from _? What about the motor areas in the anterior cord?
Posterior spinal artery
Anterior spinal artery
See PPT slide 3
A lesion compressing the lateral spinal cord will affect _. What level is first affected?
Lateral corticospinal tract.
Sacral affected first
Think they are peeling off into SPC, cervical peels off first
A lesion compressing the middle SPC will affect _ first?
Upper limbs, sacral sparing
A central cord lesion like syringimyelia will cause what pattern of deficit?
In cervical area, cape like loss of pain and temp
