The Dorsal Column-Medial Lemniscus (DCML) Pathway Explained | Touch, Vibration & Proprioception скачать в хорошем качестве

The Dorsal Column-Medial Lemniscus (DCML) Pathway Explained | Touch, Vibration & Proprioception

For more cadaveric images and question banks, visit https://bootcamp.com/med-school The dorsal column–medial lemniscus system is key for localizing sensory deficits. In this video, we explain how information about touch, vibration, and proprioception travels from the body to the brain via the fasciculus gracilis and cuneatus. We highlight the decussation in the medulla, lesion localization (ipsilateral vs contralateral deficits), and the somatotopic map that helps predict how progressive lesions (like tumors) cause stepwise sensory loss. What you’ll learn: 1. Fasciculus gracilis – medial pathway carrying lower limb input 2. Fasciculus cuneatus – lateral pathway carrying upper limb input 3. Organization of 1st, 2nd, and 3rd order neurons in the DCML system 4. Decussation in the medulla via the medial lemniscus 5. Somatotopic organization of sacral → lumbar → thoracic → cervical levels 6. Clinical correlations: ipsilateral vs contralateral sensory loss and tumor progression in the dorsal column By the end, you’ll understand how the DCML pathway organizes sensory input and how lesion location determines sensory deficits. ⏱️ Timestamps 0:00 – Intro 0:20 – Overview of the DCML pathway 0:48 – Functions: discriminative touch, vibration, proprioception & pressure 1:11 – Fasciculus gracilis → lower limb pathway (mnemonic: “L = lower”) 1:31 – Fasciculus cuneatus → upper limb pathway (mnemonic: “U = upper”) 1:51 – 1st, 2nd & 3rd order neurons in the DCML system 2:36 – Lower limb pathway (via fasciculus gracilis → nucleus gracilis) 3:02 – Decussation of 2nd order neuron in the medulla 3:32 – Medial lemniscus ascent to the thalamus 3:56 – 3rd order neuron → thalamus → primary somatosensory cortex 4:47 – Upper limb pathway (via fasciculus cuneatus → nucleus cuneatus) 5:38 – Decussation of 2nd order neuron (upper limb) → medial lemniscus 5:57 – 3rd order neuron relay to somatosensory cortex 6:20 – Lesion above decussation → contralateral sensory loss 6:47 – Lesion below decussation → ipsilateral sensory loss 7:16 – Lesion in nucleus gracilis or cuneatus → ipsilateral deficits 7:49 – Somatotopic organization of the dorsal columns (sacral → lumbar → thoracic → cervical) 8:47 – Adding sensory levels as spinal cord ascends 9:12 – Clinical scenario: intramedullary lesion compressing dorsal columns 9:37 – Stepwise sensory loss: sacral → lumbar → thoracic → cervical 10:01 – Summary of DCML function & lesion patterns 10:21 – Wrap-up & references This lesson is especially helpful for medical students, or anyone reviewing for anatomy exams. If it helps you out, give it a like, leave your questions in the comments, and subscribe for more Bootcamp videos. TikTok:   / medschoolbootcamp   INSTAGRAM:   / medschoolbootcamp   #medschoolbootcamp #medicine #Medical #MedStudent #MedicalStudent #MedSchool #MedicalSchool #Doctor #Resident #Hospital #MD #Med #Anatomy #Science #Whitecoat #WhiteCoatCeremony #MS1 #ms2 ____________________________________________________________________ dorsal columns pathway, medial lemniscus pathway, DCML explained, fasciculus gracilis, fasciculus cuneatus, discriminative touch pathway, vibration sense pathway, proprioception tract, dorsal column neuroanatomy, sensory pathways explained, spinal cord tracts, first second third order neurons, somatotopic organization, ipsilateral vs contralateral lesions, neuro exam sensory loss, neuroanatomy made easy, med school neuro review, USMLE sensory pathways, NCLEX neuro review