dermatomes overlap peripheral nerve dorsal root ventral root skin
Post on 21-Dec-2015
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![Page 1: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/1.jpg)
Dermatomesoverlap
Peripheral nerve
Dorsalroot
Ventralroot
Skin
![Page 2: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/2.jpg)
Dermatomesoverlap
Peripheral nerve
Dorsalroot
Ventralroot
Skin
![Page 3: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/3.jpg)
Dorsal rootganglion
Dorsal root
Ventral root
Spinalnerve
Dorsal hornIntermediate zone
Ventral horn
Dorsalcolumn
Lateral column
Ventral column
“Anterolateral” column
![Page 4: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/4.jpg)
Merkel’s receptorMeissner’s corpuscle Pacinian
corpuscle
Dorsal column-medial lemniscalsystem Bare nerve
ending
Anterolateralsystem
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Reminder: Rexed’s laminae
![Page 6: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/6.jpg)
Demyelination
Caudal
Rostral
Somatotopic organization of the dorsal columns
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Lamina 5
![Page 8: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/8.jpg)
Lamina 5
![Page 9: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/9.jpg)
![Page 10: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/10.jpg)
Mechanoreceptor
Nociceptor
Ipsilateral loss of touch…
Contralateral loss of pain…(2-3 segments caudal to injury)
Spinal Hemisection
![Page 11: Dermatomes overlap Peripheral nerve Dorsal root Ventral root Skin](https://reader030.vdocuments.us/reader030/viewer/2022032704/56649d565503460f94a34f8f/html5/thumbnails/11.jpg)
Syringomyelia
Site of lesion
• Bilateral loss of pain & thermal senses• Preservation of mechanosensations
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Somatotopy of spinal paths
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Anterolateralsystem
Dorsal column-medial lemniscal
system
Pain,thermal,itch
Mechano…
Dorsalcolumnnuclei
Dorsalhorn
Spinalcommissure
Internalarcuatefibers
Postcentralgyrus / 1° SScx
Postcentralgyrus / Insular/Cingulatecortex
Also:•Reticular formation•Superior colliculus (mesencephalon)
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Somatic Sensory Thalamus
Medial dorsal
Ventral posterior (VMpo)
Ventral posterior lateral-VPL (spinal)Ventral posterior medial-VPM (trigem)
Touch Pain
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Internal capsule
Leg area
Arm area
Face area
Ventral posterior nucleus