What is the function of dorsal interossei muscles?
The dorsal interosseous muscles are a group of paired intrinsic muscles of the hand located between the metacarpals. They consist of four dorsal muscles that abduct the fingers. The dorsal interossei additionally assist in flexion of the metacarpophalangeal joints and extension of the interphalangeal joints.
What is the action of palmar and dorsal interossei?
Function. The palmar interosseous muscles adduct the fingers towards the middle finger. This is in contrast to the dorsal interossei, which abduct the fingers away from the middle finger.
What is the action of the Interossei muscles?
The interossei muscles are intrinsic muscles of the hand located between the metacarpals. They consist of four (or three) palmar and four dorsal muscles that, respectively. These muscles are responsible for finger adduction and abduction.
What does first dorsal interosseous muscle do?
Function. The dorsal interossei abduct the index, middle, and ring fingers. The first dorsal interosseous is also able to rotate the index finger slightly at the metacarpophalangeal joint and assist adductor pollicis in thumb adduction.
How do you test for dorsal interossei?
The dorsal interossei muscles can be palpated in the dorsum of the hand on resisted abduction of the fingers between the metacarpals. The first dorsal interosseous muscle can be tested by placing the patient’s palm flat on a table and asking the patient to abduct his/her index finger against the examiner’s resistance.
What is the difference between lumbricals and interossei?
Anatomy of the Upper Limb: Interossei and Lumbricals – YouTube
What are the 3 thenar muscles?
The three muscles are: opponens pollicis muscle. flexor pollicis brevis muscle. abductor pollicis brevis muscle.
Are lumbricals dorsal or palmar?
The lumbricals receive most of their arterial supply from the anastomotic network on the dorsal surface of the hand known as the dorsal carpal arch. Its branches, first and second dorsal metacarpal arteries and dorsal digital arteries, supply the first and second lumbricals.
What are the 4 thenar muscles?
Abstract. The four thenar muscles make up the intrinsic muscles of the thumb. They include the abductor pollicis, adductor pollicis, opponens pollicis, and flexor pollicis brevis. Thumb motion is facilitated through the coordination of these intrinsic muscles.
What are the 4 lumbricals?
The lumbricals are deep muscles of the hand that flex the metacarpophalangeal joints and extend the interphalangeal joints. It has four, small, worm-like muscles on each hand.