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INTRINSIC MUSCLES OF THE HAND-DORSAL INTEROSSEI

Anatomy-Upper Limb

INTRINSIC MUSCLES OF THE HAND-DORSAL INTEROSSEI

1. O: adjacent dorsal sides of 5 metacarpals.
2. I: base of the proximal phalanx and extensor hood of their related digits. 1st muscle inserts to lateral side of index finger. 2nd & 3rd muscles insert to either side of middle finger. 4th muscle inserts into medial side of ring finger.
3. NS: deep branch of the ulnar n.
4. BS: deep palmar arch.
5. A: abducts digits from the axial line (middle finger) of the hand, flex digits at the MCPJ and extend at IPJ.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: Case courtesy of OpenStax College, Radiopaedia.org . From the case rID: 44017

Ⓒ A. Manickam 2018

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