officebrazerzkidai.blogg.se - Closed hands out clipart

The opponens digit minimi lies deep to the other hypothenar muscles. The ulnar nerve innervates the muscles of the hypothenar eminence. These muscles are similar to the thenar muscles in both name and organisation. The hypothenar muscles produce the hypothenar eminence – a muscular protrusion on the medial side of the palm, at the base of the little finger. The deep head is innervated by the deep branch of the ulnar nerve.

Actions: Flexes the metacarpophalangeal (MCP) joint of the thumb.

Attaches to the base of the proximal phalanx of the thumb.

Attachments: Originates from the tubercle of the trapezium and from the associated flexor retinaculum.

Attaches to lateral side of proximal phalanx of the thumb. Attachments: Originates from the tubercles of the scaphoid and trapezium, and from the associated flexor retinaculum.

This muscle is found anteriorly to the opponens pollicis and proximal to the flexor pollicis brevis.

Actions: Opposes the thumb, by medially rotating and flexing the metacarpal on the trapezium.

It inserts into the lateral margin of the metacarpal of the thumb (i.e.

Attachments: Originates from the tubercle of the trapezium, and the associated flexor retinaculum.

The opponens pollicis is the largest of the thenar muscles, and lies underneath the other two. The median nerve innervates all the thenar muscles. They are responsible for the fine movements of the thumb. The muscle bellies produce a bulge, known as the thenar eminence. The thenar muscles are three short muscles located at the base of the thumb.