Where does abductor pollicis brevis originate?
Origin. It takes its origin from the front of transverse carpal ligament, extending into the tubercles of scaphoid and trapezium with an occasional contribution from the tendon of abductor pollicis longus.
What is the origin of the extensor pollicis longus?
Extensor pollicis longus muscle
| Origin | Posterior surface of middle third of ulna and interosseus membrane |
|---|---|
| Insertion | Posterior aspect of base of distal phalanx of thumb |
| Action | Wrist joints: Weak hand extension Metacarpophalangeal and interphalangeal joint of thumb: Thumb extension |
What is the origin of the extensor pollicis brevis?
Origin. The extensor pollicis brevis originates from the lower third of the posterior surface of the radius and the interosseous membrane.
What is the origin of the extensor Indicis muscle?
Extensor indicis muscle
| Origin | Posterior surface of distal third of ulna and interosseus membrane |
|---|---|
| Insertion | Extensor expansion of index finger |
| Action | Wrist joints: Weak hand extension Metacarpophalangeal and interphalangeal joints of index finger: Finger extension |
| Innervation | Posterior interosseous nerve (C7, C8) |
What is the origin of abductor pollicis longus?
Abductor pollicis longus muscle
| Origin | Posterior surface of proximal half of radius, ulna and interosseus membrane |
|---|---|
| Insertion | Base of metacarpal bone 1, (trapezium bone) |
| Action | Radiocarpal joint: Hand extension; Carpometacarpal joint of thumb: Thumb abduction and extension |
| Innervation | Posterior interosseous nerve (C7, C8) |
What is the origin of the adductor pollicis?
Adductor pollicis muscle
| Origin | Transverse head: Palmar base of metacarpal bone 3 Oblique head: Capitate bone, palmar bases of metacarpal bones 2 & 3 |
|---|---|
| Insertion | Medial base of proximal phalanx 1 (via ulnar sesamoid bone) |
| Action | Carpometacarpal joint 1: Thumb adduction |
| Innervation | Deep branch of ulnar nerve (C8, T1) |
What is extensor pollicis longus?
Extensor pollicis longus (EPL) is a long muscle located at the deep layer with extensor pollicis brevis, abductor pollicis longus, extensor indicis, and supinator muscle in the posterior compartment of the forearm.
What is the origin of the abductor pollicis longus?
Is abductor pollicis longus and extensor or flexor?
The Abductor pollicis longus (APL) is one of a deep extensor of the forearm and is responsible for facilitating movement and stabilization of the thumb. Its tendon is present in the first extensor compartment of the wrist. It lies immediately below the supinator and sometimes unites with it.
Where is the abductor pollicis longus?
forearm
The Abductor pollicis longus (APL) is one of a deep extensor of the forearm and is responsible for facilitating movement and stabilization of the thumb. Its tendon is present in the first extensor compartment of the wrist. It lies immediately below the supinator and sometimes unites with it.
What is the origin of the extensor carpi radialis?
Extensor carpi radialis longus muscle
| Origin | Lateral supracondylar ridge of humerus, lateral intermuscular septum of arm |
|---|---|
| Insertion | Posterior aspect of base of metacarpal bone 2 |
| Actions | Wrist joints: Hand extension, hand abduction (radial deviation) |
| Innervation | Radial nerve (C5-C8) |
What is the origin and insertion of abductor pollicis longus?
Origin and insertion Abductor pollicis longus originates from the posterior surface of the proximal half of the radius, ulna and intervening interosseous membrane. The site of origin is located just inferior to the insertion of the anconeus muscle.