What is the abductor pollicis longus?
What is the abductor pollicis longus?
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.
Why is it called abductor pollicis longus?
In human anatomy, the abductor pollicis longus (APL) is one of the extrinsic muscles of the hand. Its major function is to abduct the thumb at the wrist….
| Abductor pollicis longus muscle | |
|---|---|
| Origin | ulna, radius, Interosseous membrane |
| Insertion | Base of 1st metacarpal |
| Artery | Posterior interosseous artery |
What does the Pollicis longus do?
Function. The FPL mainly flexes interphalangeal joint of the distal phalanx of the thumb. It also serves as accessory flexors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal. It may also assist in wrist joint flexion.
What is the action of the adductor Pollicis?
The main function of the adductor pollicis is to adduct the thumb. Because of the altered plane of the thumb in relation to the palm and other digits, adduction, in this case, refers to bringing the thumb into a position of opposition at the center of the palm.
What does the term Pollicis mean?
of the thumb
/ˈpɒl.ɪ.sɪs/ a Latin word meaning “of the thumb,” used in medical names and descriptions. SMART Vocabulary: related words and phrases. The hand. carpal.
What are the attachments of the 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 action of the abductor pollicis brevis?
Function. It acts to abduct the carpometacarpal joint of the thumb.
What is the meaning of Pollicis?
/ˈpɑːl.ɪˌsɪs/ a Latin word meaning “of the thumb”, used in medical names and descriptions. The hand. carpal.
What does Pollicis mean in muscles?
Medical Definition of adductor pollicis : a muscle of the hand with two heads that adducts the thumb by bringing it toward the palm. — called also adductor pollicis muscle.
What does longus mean?
long
a Latin word meaning “long,” used in the medical names and descriptions of some muscles.
What is the meaning of abductor in English?
abductor noun [C] (PERSON) a person who makes someone go somewhere with them, especially using threats or violence: She was tortured by her abductors. It is thought that the woman might have known her abductor. SMART Vocabulary: related words and phrases.
What is the origin and insertion of the 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.
What is the action of the extensor pollicis longus?
ACTION. Extends interphalangeal and metacarpophalangeal joints of thumb. NERVE.
Is there an adductor pollicis longus?
In human anatomy, the adductor pollicis muscle is a muscle in the hand that functions to adduct the thumb….
| Adductor pollicis muscle | |
|---|---|
| Nerve | deep branch of the ulnar nerve (T1) |
| Actions | adducts the thumb at the carpometacarpal joint |
| Antagonist | Abductor pollicis longus muscle, Abductor pollicis brevis muscle |
| Identifiers |
What does longus and brevis mean?
The second word in these two muscle names refers to the size of the muscle. The word brevis is a Latin word meaning short and the word longus is a Latin word meaning long. So, you could put the words together to get an understanding of the size and action of each muscle.
How do abductors work?
Instructions:
- Lie on your back with bent knees and your feet in toward your hips.
- Press your palms into the floor alongside your body.
- Extend your right leg so it’s straight.
- Lift your hips up as high as you can.
- Hold this position for 30 seconds.
- Do each side 2–3 times.
Where is the adductor longus muscle?
inner thigh
The adductor longus muscle is a hip abductor muscle located in the inner thigh. This muscle controls the thigh bone’s ability to move inward and from side to side.
What nerve innervates the abductor pollicis longus?
posterior interosseous nerve
Innervation. Abductor pollicis longus is innervated by the posterior interosseous nerve (C7, C8), which is a continuation of the deep branch of the radial nerve. The radial nerve is a branch of the posterior cord of the brachial plexus.
What does the term longus mean?
/ˈlɒŋ.ɡəs/ a Latin word meaning “long,” used in the medical names and descriptions of some muscles.
What does adductor longus mean?
The adductor longus muscle is a hip abductor muscle located in the inner thigh. This muscle controls the thigh bone’s ability to move inward and from side to side.
• Abductor pollicis longus abducts the thumb. • Extrinsic muscle. • Located in the first dorsal/extensor compartment. • Often has multiple tendon slips. • Inflamed in DeQuervain’s tenosynovitis.
What is the extensor pollicis longus?
It is one of the five deep extensors in the forearm, along with the supinator, extensor pollicis brevis, extensor pollicis longus and extensor indicis. Apart from supinator, all the deep extensor muscles span from the forearm to the hand, crossing the wrist joints and thus being able to act upon them.
What nerve innervates abductor pollicis longus?
Abductor pollicis longus is innervated by the posterior interosseous nerve (C7, C8), which is a continuation of the deep branch of the radial nerve. The radial nerve is a branch of the posterior cord of the brachial plexus.
What artery supplies blood to the abductor pollicis longus?
Blood supply to the abductor pollicis longus muscle comes from the interosseous branches of the ulnar artery; The proximal part of the muscle is supplied by the lateral branch of the posterior interosseous artery. The distal part is vascularised by a perforating branch of the anterior interosseous artery.
