ACB 8120 Lecture Notes - Lecture 53: Postcentral Gyrus, Medial Lemniscus, Substantia Gelatinosa Of Rolando
12 Apr 2020
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Document Summary
When all of these come in via dorsal root, there is chaos because they all need to find the correct elevator. 3 neuron chain from receptor to postcentral gyrus. Receptor to the dorsal horn synapse decussate elevate synapse in thalamus then post central gyrus in parietal lobe. Convey conscious proprioception, discriminative fine touch, vibration. Start in periphery stop in nuclei of medulla. Secondary this part is the medial lemniscus tract. Start in nucleus of medulla stop in thalamus. G elevator - gracilis in dorsal column more medial lower limbs. C elevator = cuneate in dorsal column more lateral upper limbs. Start in thalamus stop in post central gyrus of parietal. Posterior spinocerebellar pathway 2 neurons usually 3. Convey unconscious proprioception required for coordination of posture and limb movement. Ipsilateral = posterior spinal cerebellar tract to cerebellum. Decussate in the spinal cord same level it comes in. Web out on the 3rd to go everywhere.
