What nerve innervates the abductor pollicis longus?
Posterior Interosseous nerve
It is supplied by the Posterior Interosseous nerve (C7-C8) which is a continuation of the deep branch of the Radial nerve.
What nerve innervates the adductor pollicis?
the ulnar nerve
The adductor pollicis is innervated by the deep branch of the ulnar nerve (C8-T1).
What nerve innervates the abductor pollicis brevis?
The median nerve
The median nerve supplies the abductor pollicis brevis (APB) muscle at the lateral border of the thenar eminence which abducts the thumb at right angles to the palm.
What nerve Innervates abduction of thumb?
the median nerve
| Abductor pollicis brevis muscle | |
|---|---|
| Artery | Superficial palmar arch |
| Nerve | Recurrent branch of the median nerve |
| Actions | Abduction of the thumb by acting across the carpometacarpal joint and the metacarpophalangeal joint. It also assists in opposition and extension of the thumb. |
| Antagonist | Adductor pollicis muscle |
What nerve innervates the extensor pollicis longus?
posterior interosseous nerve
It is innervated by the deep branch of the radial nerve via the posterior interosseous nerve (7th and 8th cervical nerve root).
Why is the adductor pollicis innervated by the ulnar nerve?
Adductor pollicis is a triangular intrinsic muscle of the hand….Adductor pollicis muscle.
| Origin | Transverse head: Palmar base of metacarpal bone 3 Oblique head: Capitate bone, palmar bases of metacarpal bones 2 & 3 |
|---|---|
| Action | Carpometacarpal joint 1: Thumb adduction |
| Innervation | Deep branch of ulnar nerve (C8, T1) |
| Blood supply | Deep palmar arch |
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 tendon is located in between the abductor pollicis longus and extensor pollicis longus?
EPL tendon. The extensor pollicis brevis (EPB) tendon. The abductor pollicis longus (APL) tendon.
Where is abductor pollicis longus?
forearm
Abductor pollicis longus is a muscle found in the posterior compartment of the forearm. It is one of the five deep extensors in the forearm, along with the supinator, extensor pollicis brevis, extensor pollicis longus and extensor indicis.
What is the insertion of the abductor pollicis longus?
The superficial part is inserted with one or more tendons into the radial side of the base of the first metacarpal bone, and the deep part is variably inserted into the trapezium, the joint capsule and its ligaments, and into the belly of abductor pollicis brevis (APB) or opponens pollicis.