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Radial head of flexor digitorum ...

Other Terms: Caput radiale (Musculus flexor digitorum superficialis), Caput radiale musculus flexoris digitorum superficialis

Muscle parts

Humero-ulnar head; Radial head

Latin name

Musculus flexor digitorum superficialis

Latin muscle parts

Caput humerulnare; Caput radiale

Group

Antebrachial muscle – anterior compartment – superficial group

Etymology

In English this muscle’s name is the deep muscle toward the surface that bends the fingers. The word flexor comes from the Latin flectere meaning “to bend.” The term digitorum is from the Latin digitus, which originally meant the “pointing thing,” a term that is similar to the Sanskrit word “dic” meaning to show or point out. Because we point with our fingers the term was applied to the fingers and then the toes. The term superficialis is Latin for “near the surface.” It arises from the Latin superficies meaning “surface”.

Origin

Medial epicondyle of humerus via the common flexor tendon, anterior surface of ulnar collateral ligament, medial surface of the coronoid process (humeroulnar head); anterior surface of radius from radial tuberosity to mid-radius (radial head)

Insertion

Individual tendons split and wrap around deep tendons before reuniting to attach to anterior surface of the middle phalanges of the four fingers (independent tendons to all fingers)

Action

Flexion of wrist and digits (except last digital joint); tendon arrangement allows it to flex one proximal interphalangeal joint at a time

Nerve supply

Median nerve (C8 and T1)

Blood supply

From proximal to distal, the belly of the muscle receives blood supply from the ulnar collateral arteries, the anterior and posterior ulnar recurrent arteries, and small muscular branches from the ulnar artery. The distal tendon receives its supply from the superficial palmar arch and common and proper palmar digital arteries.

Latin

Caput radiale musculus flexoris digitorum superficialis

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