Palmar Interossei Muscles - Origins & Function - Human Anatomy | Kenhub

In this video we will explore the anatomy of the palmar interossei muscles: origin, insertion, innervation and function. Take our quiz about the muscles of the hand at https://khub.me/zfz2a

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The palmar interossei are a set of three muscles located in the metacarpus. They originate from the metacarpal bones of the index, ring and little finger and extend to the dorsal aponeurosis and the base of the proximal phalanx of their respective finger. The palmar interossei muscles are innervated by the deep branch of the ulnar nerve and work together to close your spread fingers.

In this video we will go over the relevant anatomy facts about the palmar interossei muscles and also explain what's the deal about mnemonic PAD DAB:

- 0:08 palmar interossei origin and insertion
- 1:22 innervation by the ulnar nerve
- 1:30 palmar interossei action (PAD DAB)

Current literature assumes that there are three palmar interossei. However, German anatomist Henle has described a fourth palmar interosseous between the thumb and the index finger (palmar interosseous of Henle).

At first, it was assumed that the fibers he found were not an independent muscle, but instead part of either the adductor pollicis or flexor pollicis brevis. However, newest studies have shown that most people actually do have one additional short hand muscle between the thumb and the index finger. At this point, it is not clarified how this unknown muscle should be classified and which function it fulfills.

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Continue with this study unit by reading about the lumbrical muscles of the hand in our free article and build your knowledge about the structures of the wrist and hand: https://khub.me/g83pn

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