Spine & Back Flashcards
Posterior column/Dorsal column/Medial lemniscus pathway carries which sensations?
1) 2-point discrimination
2) Fine touch
3) Proprioception
4) Vibration
5) Position sense
Think of playstation controller
What sensation does the Meissner corpuscles sense?
superficial light touch and Low Hz vibration
What sensation does the Merkel endings sense?
Pressure & position
What sensation does the Ruffini endings sense?
Pressure
What sensation does the Pacini corpuscles sense?
High Hz vibration
What sensation does the Golgi tendon organs sense?
proprioception from muscle spindles
What are the motor pathways in the spinal column?
Descending
What are the sensory pathways in the spinal column?
Ascending
Posterior column/Dorsal column/Medial lemniscus pathway deccusates at which level?
Internal arcuate fibres in the Medulla
How many spinothalamic tracts are there?
1) Anterior - crude touch & pressure
2) Lateral - pain & temperature
Where do the spinothalamic tracts deccusate?
1 or 2 spinal levels above the spinal entry level
Corticospinal pathways carry which sensations?
motor
Corticospinal pathways consist of …
1) Anterior - carries 20% of fibres
Carries central axial and girdle muscles
2) Lateral - carries 80% of fibres
Also carries motor sensation for fine movements of limbs
These are the pyramidal tracts
Corticospinal pathway deccusates at which level?
Level of pyramids of lower medulla - lateral corticospinal
Level of spinal nerve - anterior corticospinal
Within the dorsal column, what structures carries sensory in lower limb?
Gracile Fasciculus
