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. Note this patter was established before the week 8 limb rotation, so this pattern is rotated for both the upper and lower limbs.

Spinal Nerve Pattern

Spinal Nerve Skin Innervation Pattern
Spinal Nerve Acronym Innervation
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 In the perianal area, less than one cm lateral to the mucocutaneous zone.
Sacral spinal nerve 5 S5 In the perianal area, less than one cm lateral to the mucocutaneous zone.
 Links: | Spinal Nerve Dermatomes | Spinal Nerve Myotomes | touch | integumentary


Links: touch | limb | integumentary

Reference

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



Cite this page: Hill, M.A. (2019, January 20) Embryology Dermatomes.png. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Dermatomes.png

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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