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What is the main blood supply to the abductor digiti minimi?
Posterior interosseous artery
Anterior interosseous artery
Palmar metacarpal artery
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The main blood supply to the abductor digiti minimi is the ulnar artery.
The abductor digiti minimi is responsible for abducting the 5th digit away from midline. It is innervated by the deep branch of the ulnar nerve (C8 + T1). The main blood supply to the muscle is provided by the deep branch of ulnar artery.
Uysal et al. explored the vascular anatomy of the abductor digit minimi. They suggest that the abductor digit minimi could be used as a flap in severe crushed injuries of the hand. The vascular supply to the muscle is via 1 major and 2 constant minor pedicles. The anatomy is important during dissection as the major pedicle branches off the ulnar artery just distal to its origin off the pisiform.
Illustration A shows the arterial supply to the hand. Illustration B shows microangiography of the left hand with hypothenar compartment excised, showing ulnar artery supply to abductor digiti minimi (ADM) and flexor digiti minimi (FDM). (+, the hamate bone; *, the ulnar artery; d, dominant major pedicles; m1, first minor pedicles; m2, second minor pedicles)
Answer 2: Posterior interosseous artery supplies the superficial and deep extensor compartment muscles in the forearm.
Answer 3: Anterior interosseous artery supplies the flexor compartment muscles in the forearm.
Answer 4: Palmar metacarpal artery supply the palmar interossei muscles.
Answer 5: Radial artery supplies the thenar muscles in the hand
Uysal AC, Alagöz MS, Tüccar E, Sensöz O, Tekdemir I.
J Hand Surg Am. 2005 Jan;30(1):172-6. PMID: 15680577 (Link to Abstract)
Uysal, JHS 2005
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