Ascending Tracts | Spinocerebellar Tract

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Thank you so much for your efforts. I am a Neuropsychologist, and spent a lot of the 90's learning neuroanatomy from textbooks. What a luck people have today. Even for me, it makes me want to see the videos, and then review the books, but now with an "unfair" advantage. You can't imagine the difference this would have made for me back in 1999...

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[@stacy2126]

2:19 Dorsal (posterior) spino-cerebellar tract: C8~L2,3
9:14 1st order neuron; dorsal root ganglion
9:24 2nd order neuron; Clarke's column (nucleus dorsalis)
10:19 Inferior cerebellar peduncle
10:36 Dorsal spinocerebellar tract
11:11 3rd order neuron; cerebellar cortex
11:40 Ventral (anterior) spinocerebellar tract : below L3
13:13 Decussation
14:14 Superior cerebellar peduncle
14:40 VST crosses behind the brainstem
15:00 DST/ VST comparison
16:28 Cuneocerebellar tract; C1~C8
21:!0 Inferior olivary nulcei-> inferior cerebellar peduncle
Fibers that stretches from inf. cbr nuclei-> cbr: "Climbing" fibers
anywhere else->cbr: "Mossy" fibers

[@shaileshkandpal238]

3rd order neuron - cerebellar cortex not cerebral cortex

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Amazing explanation! Cleared up so much and the last part about mossy fibers and climbing fibers just cleared up so much. Thank You.

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thank you so much for making the spinocerebellar tracts sound like a breeze!! always used to mess them up, but this has really made it super easy to understand!

[@shanartz8152]

Dorsal (posterior) spinocerebellar tract
The primary function of the dorsal (posterior) spinocerebellar tract is to relay cerebellar tract proprioceptive input from the neuromuscular spindles and GTOs of the ipsilateral trunk and lower limb, to the cerebellum. It should be recalled, however, that it also relays some touch and pressure sensation from the skin of the ipsilateral trunk and lower limb.
First order neurons (pseudounipolar neurons) whose cell bodies are housed in the dorsal root ganglia send their peripheral processes to the skin, muscles, tendons, and joints. Here they perceive proprioceptive information, which is then transmitted to the spinal cord by their central processes.
These central processes join the medial division of the dorsal roots of the spinal nerves to synapse in the nucleus dorsalis (Clark’s column, lamina VII of spinal cord levels C8 to L2, 3) at their level of entry. Sensory information transmitted by spinal nerves entering at the sacral and lower lumbar spinal cord levels (below Clark’s column) is relayed to the caudal extent of the nucleus dorsalis (L2, 3) by ascending in the fasciculus gracilis.
Clark’s column houses the cell bodies of second order neurons whose axons form the dorsal spinocerebellar tract, which ascends ipsilaterally in the lateral funiculus of the spinal cord. When this tract reaches the brainstem it joins the restiform body (of the inferior cerebellar peduncle), and then passes (as “mossy fibers”) into the vermis of the cerebellum. The dorsal spinocerebellar tract relays proprioceptive information directly to the cerebellum where this information is processed; it plays an important role in the fine coordination of movements of individual lower limb muscles or synergistic muscles controlling movement of the same joint and in the maintenance of posture.
FROM
A Textbook of Neuroanatomy
Second Edition
Maria A. Patestas
Leslie P. Gartner

[@xDomglmao]

Thank you. Question, SC normally ends at L1, Clark's column ends at L3, how is that possible?

[@shanartz8152]

@@xDomglmao Do not confuse with spinal cord segments for vertebral level. Conus medullaris ends at L1 level which corresponds to spinal segment coccyx 1

[@xDomglmao]

@@shanartz8152 Conus ends at L1 vertebra and this means coccyx 1?

[@shanartz8152]

@@xDomglmao kindly google vertebral level and spinal segment ( look for images)

[@xDomglmao]

@@shanartz8152 Thank you! I checked 5 different sources and all were not precise but it makes sense how you explained it! :) Enjoy your day
EDIT: So I checked the pictures and please correct me if I am wrong: I was told by my teacher today that Clarke's column ends with the SC (which would mean vertebra L1); but when I checked which spinal segment this equals, it says T11 - so if I compare this with what you suggested initially (that the books' "L3" were referring to spinal segments rather than vertebra, which initially made perfect sense) it doesn't work out anymore :/
So either I misunderstood my teacher or something still not ok :/
EDIT: Fuck, man, you are right! Thx!

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