File:Dermatomes.png

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Dermatomes.png(424 × 600 pixels, file size: 82 KB, MIME type: image/png)

Skin Dermatomes

Image shows the approximate spinal cord nerve segmental innervation of the skin regions.

Spinal Nerve Pattern

  • Cervical spinal nerve 2 (C2)) - At least one cm lateral to the occipital protuberance at the base of the skull. Alternately, a point at least 3 cm behind the ear.
  • Cervical spinal nerve 3 (C3) - In the supraclavicular fossa, at the mid-clavicular line.
  • Cervical spinal nerve 4 (C4) - Over the acromioclavicular joint.
  • Cervical spinal nerve 5 (C5) - On the lateral (radial) side of the antecubital fossa, just proximally to the elbow.
  • Cervical spinal nerve 6 (C6) - On the dorsal surface of the Proximal phalanges (proximal phalanx of the thumb).
  • Cervical spinal nerve 7 (C7) - On the dorsal surface of the Proximal phalanges (proximal phalanx of the middle finger).
  • Cervical spinal nerve 8 (C8) - On the dorsal surface of the proximal phalanx of the little finger.
  • Thoracic spinal nerve 1 (T1) - On the medial (ulnar) side of the antecubital fossa, just proximally to the medial epicondyle of the humerus.
  • Thoracic spinal nerve 2 (T2) - At the apex of the axilla.
  • Thoracic spinal nerve 3 (T3) - Line-line intersection (Intersection of the mid-clavicular line and the third intercostal space
  • Thoracic spinal nerve 4 (T4) - Intersection of the midclavicular line and the fourth intercostal space, located at the level of the nipples.
  • Thoracic spinal nerve 5 (T5) - Intersection of the midclavicular line and the fifth intercostal space, horizontally located midway between the level of the nipples and the level of the xiphoid process.
  • Thoracic spinal nerve 6 (T6) - Intersection of the midclavicular line and the horizonal level of the xiphoid process.
  • Thoracic spinal nerve 7 (T7) - Intersection of the midclavicular line and the horizontal level at one quarter the distance between the level of the xiphoid process and the level of the umbilicus.
  • Thoracic spinal nerve 8 (T8) - Intersection of the midclavicular line and the horizontal level at one half the distance between the level of the xiphoid process and the level of the umbilicus.
  • Thoracic spinal nerve 9 (T9) - Intersection of the midclavicular line and the horizontal level at three quarters of the distance between the level of the xiphoid process and the level of the umbilicus.
  • Thoracic spinal nerve 10 (T10) - Intersection of the midclavicular line, at the horizontal level of the umbilicus.
  • Thoracic spinal nerve 11 (T11) - Intersection of the midclavicular line, at the horizontal level midway between the level of the umbilicus and the inguinal ligament.
  • Thoracic spinal nerve 12 (T12) - Intersection of the midclavicular line and the midpoint of the inguinal ligament.
  • Lumbar spinal nerve 1 (L1) - Midway between the key sensory points for T12 and L2.
  • Lumbar spinal nerve 2 (L2) - On the anterior medial thigh, at the midpoint of a line connecting the midpoint of the inguinal ligament and the medial epicondyle of the femur.
  • Lumbar spinal nerve 3 (L3) - At the medial epicondyle of the femur.
  • Lumbar spinal nerve 4 (L4) - Over the medial malleolus.
  • Lumbar spinal nerve 5 (L5) - On the foot dorsum dorsum of the foot at the third metatarsophalangeal joint.
  • Sacral spinal nerve 1 (S1) - On the lateral aspect of the calcaneus.
  • Sacral spinal nerve 2 (S2) - At the midpoint of the popliteal fossa.
  • Sacral spinal nerve 3 (S3) - Over the tuberosity of the ischium or infragluteal fold.
  • Sacral spinal nerve 4 (S4) - and Sacral spinal nerve 5 (S5) - In the perianal area, less than one cm lateral to the mucocutaneous zone.

Reference

Image Source: http://en.wikipedia.org/wiki/File:Dermatoms.svg



Cite this page: Hill, M.A. (2021, December 9) Embryology Dermatomes.png. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Dermatomes.png

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© Dr Mark Hill 2021, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current12:54, 15 September 2009Thumbnail for version as of 12:54, 15 September 2009424 × 600 (82 KB)S8600021 (talk | contribs) Source: http://en.wikipedia.org/wiki/File:Dermatoms.svg