A skeletal muscle situated on the ulnar border of the palm of the hand that leads the smallest digit away (i.e. abduction) from the rest of the hand. 

It forms the ulnar border of the palm and its spindle-like shape defines the hypothenar eminence of the palm together with the skin, connective tissue, and fat surrounding it.

It is innervated by the deep branch of the ulnar nerve (C8–T1). Its homolog in the lower limb is the abductor digiti minimi muscle in the foot.

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