Ascending Tracts | Dorsal Column: Medial Lemniscus Pathway

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Dorsal cloumn medial leminisus-
Types of sensation-
Fine discriminative touch
2 point touch
Pressure touch of skin
Proprioception
.
Receptor-
Raffinis corpuscle/bulbus corpuscy- vibration and stretch of skin.
Pretracheal nerve endings- hair bend and touch.
Paccinian corpuscle- deep pressure.
Merkel disc- fine touch and superificial pressure.
Meissners corpuscle- discriminative touch.
Muscle spindle- 1A proprioception.
Golgi tendon- stretch of muscle tendon.
A alpha fibers- muscle tendon and Golgi tendon-.
A beta - rest .
Cervical part of spinal cord above T6.
LUMBAR PART Of spinal cord below T6.
1 St order neuron- drg.
2nd - nucleus fasciulus
Nucleus cuneatus.
3rd -internal capsule.
Drg
Fasciulus gracilis- lower limb
Fasciulus cuneatus- upper limb
Somatotopic arrangements-
Medial to lateral
Sacrum to cervix.
Ipsilateral SC.
Nucleus cuneatus
Nucleus gracilis
Cross to opposite side C/L internal arcuate fibers.
Medial leminisus
ThalamusVPL/VPI
Posterior limb of internal capsule.
Corona radiata
Primary somatosensory area
Secondary somatosensory area.
Sensory homunculus.
Lenticular artery branch of middle cerebral artery supply internal capsule. Loss of sensation.
Thank you sir

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can't stress enough how useful these ascending tract videos have been. i've not understood them for the first four years of medical school, and it took this guy 36 minutes for me to grasp the concept. huge thanks

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I was really struggling with these tracts! Watching these videos has helped immensely! I seriously cannot thank you enough!

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I'm so glad that I found your channel, I've been trying to wrap my head around these tracts for weeks and in half an hour of watching your video I understand it completely! Thank you so much!

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Such a great video! Im so glad Ive discovered your channel! I always remember it as GRacile = GRound (stomping legs on the ground) and cuniate = Cervical spine (upper limb), just in case someone needs help remembering it :)

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F.gracilis .....'gracilis' is a lower limb muscle.....just another mnemonic😁

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Other mnemonic is fasciculus Gracilis other name is Goll
With your musculus gracilis get a Goal :D (fas.gracilis get sensibility from your legs)
(Musculus Garcilis-M is midle at the spinal cord, the Fasciculus Gracilis is at the middle)

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Amazing work! A small detail is that the drawing of the internal capsule is mirrored (anterior and posterior limbs are facing towards the midlinestructures instead of lateral).

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