Dominic Stone
The adductor pollicis muscle is a fleshy, flat, triangular, and fan-shaped muscle in the hand that is responsible for adducting the thumb, or moving it towards the index finger from an abducted position. It is the most powerful of the intrinsic muscles of the hand, which are located within the hand itself and are responsible for fine motor functions. The adductor pollicis muscle has two heads, the transverse and oblique, that originate from different locations and converge into one muscle belly. This muscle is essential for functions that require pinching and gripping, as well as for hand dexterity.
| Characteristics | Values |
|---|---|
| Muscle Name | Adductor Pollicis |
| Muscle Type | Intrinsic |
| Muscle Shape | Fleshy, flat, triangular, fan-shaped |
| Muscle Heads | Two (Transverse and Oblique) |
| Function | Adduction of the thumb, pinching, gripping, rotation, opposition, flexion, extension |
| Innervation | Ulnar nerve, Median nerve (C8 and T1) |
| Testing | Froment's sign |
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What You'll Learn
- The adductor pollicis muscle is a large triangular muscle with two heads: transverse and oblique
- The adductor pollicis muscle is the most powerful of the intrinsic muscles of the hand
- The adductor pollicis muscle evolved from the contrahens I muscle as human ancestors' thumbs and big toes became opposable
- The adductor pollicis muscle is responsible for the adduction of the thumb, which is the movement of the thumb towards the index finger from an abducted position
- The adductor pollicis muscle is innervated by the ulnar nerve and is weakened in ulnar nerve palsy
The adductor pollicis muscle is a large triangular muscle with two heads: transverse and oblique
The adductor pollicis muscle is a large, fleshy, flat, and fan-shaped muscle that is intrinsic to the hand. It is located deep in the thenar compartment, beneath the long flexor tendons and the lumbrical muscles at the centre of the palm. It is the most powerful of the intrinsic muscles of the hand. The adductor pollicis muscle has two heads: the transverse and the oblique. The transverse head originates from the palmar base of the third metacarpal bone, while the oblique head originates from the capitate bone and the palmar bases of the second and third metacarpals. The radial artery passes anteriorly through the space between the two heads, forming the deep palmar arch.
The main function of the adductor pollicis muscle is the adduction of the thumb, which is the movement of the thumb towards the index finger from an abducted position. This action is essential for functions that require pinching and gripping. The adductor pollicis also aids in the later stages of opposition of the thumb, which is a combination of adduction, medial rotation, flexion, and adduction of the thumb so that it can touch each fingertip of the same hand.
The strength of the adductor pollicis muscle can be tested through Froment's sign, where the thumb is pushed against the index finger while an examiner attempts to pull them apart. The muscle is innervated by the ulnar nerve, and its weakness can be observed in ulnar nerve palsy. The adductor pollicis evolved from the contrahens I muscle as human ancestors' thumbs and big toes became opposable.
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The adductor pollicis muscle is the most powerful of the intrinsic muscles of the hand
The adductor pollicis muscle is responsible for adduction of the thumb, which is the movement of the thumb towards the index finger from an abducted position. This action is essential for functions that require pinching and gripping, and the strength of the adductor pollicis can be tested by pushing the thumb against the index finger while attempting to pull them apart. The adductor pollicis also aids in the later stages of opposition of the thumb, which is a combination of adduction, medial rotation, flexion, and adduction of the thumb so that it can touch each fingertip of the same hand.
The adductor pollicis muscle evolved from the contrahens I muscle as human ancestors' thumbs and big toes became opposable. In the Pan-Homo LCA, the oblique head of the adductor pollicis likely had a relatively small physiological cross-sectional area (PCSA), and both heads probably acted as extensors and adductors at the carpometacarpal joint. The adductor pollicis muscle is innervated by the ulnar nerve, and Froment's sign is used to test its strength.
The intrinsic muscles of the hand are located within the hand itself and are responsible for fine motor functions. The thenar muscles are a group of three short muscles located at the base of the thumb, known as the thenar eminence. These muscles are responsible for the fine movements of the thumb and include the abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis. The adductor pollicis is one of the intrinsic muscles of the hand and plays a crucial role in hand dexterity and grip strength.
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The adductor pollicis muscle evolved from the contrahens I muscle as human ancestors' thumbs and big toes became opposable
The adductor pollicis muscle is a muscle in the hand that functions to adduct the thumb, allowing it to move towards the index finger from an abducted position. This action is essential for functions that require pinching and gripping. The adductor pollicis is the most powerful of the intrinsic muscles of the hand and has two heads: transverse and oblique.
The evolution of the adductor pollicis muscle is closely tied to the development of opposable thumbs in human ancestors. As the thumbs and big toes of our ancestors became opposable, the adductor pollicis muscle evolved from the contrahens I muscle. This evolution enabled early humans to perform precise and coordinated movements with their thumbs, enhancing their ability to grip, manipulate objects, and perform tasks requiring pinching.
The adductor pollicis muscle is triangular and fan-shaped, lying deep within the thenar compartment of the hand. It originates from the capitate bone and the palmar bases of the second and third metacarpals. From these origin points, the muscle fibres converge to form a tendon that inserts into the base of the proximal phalanx of the thumb.
The transverse head of the adductor pollicis, also known as the adductor transversus pollicis, has a distinct origin at the palmar base of the third metacarpal bone. It is deeply seated and triangular in shape, with its fibres converging to insert into the ulnar side of the proximal phalanx. The oblique head, or adductor obliquus pollicis, arises from the capitate bone, the bases of the second and third metacarpals, and associated ligaments and tendons.
The evolution of the adductor pollicis muscle from the contrahens I muscle was a significant development in human evolution, enabling our ancestors to perform intricate tasks requiring thumb opposition and fine motor skills. This evolutionary adaptation continues to play a vital role in the dexterity and functionality of the human hand.
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The adductor pollicis muscle is responsible for the adduction of the thumb, which is the movement of the thumb towards the index finger from an abducted position
The adductor pollicis muscle is essential for functions that require pinching and gripping, as well as aiding in the later stages of opposition of the thumb. This opposition movement is a combination of actions, including adduction, medial rotation, flexion, and further adduction, allowing the thumb to touch each fingertip of the same hand. The strength of the adductor pollicis can be tested by pushing the thumb against the index finger while trying to pull them apart.
The adductor pollicis evolved as human ancestors' thumbs and big toes became opposable. It might also contain an element of the thumb's interosseous muscle. In terms of innervation, the ulnar nerve is stimulated during neuromuscular monitoring to measure the strength of adduction pollicis contraction.
The adductor pollicis muscle is a fleshy, flat, triangular, and fan-shaped muscle deep in the thenar compartment of the hand. It overlies the metacarpal bones and the interosseous muscles, with the radial artery passing anteriorly between its two heads. The muscle ends in a tendon that contains a sesamoid bone and inserts into the base of the proximal phalanx of the thumb.
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The adductor pollicis muscle is innervated by the ulnar nerve and is weakened in ulnar nerve palsy
The adductor pollicis muscle is a muscle in the hand that functions to adduct the thumb, or move it towards the index finger from an abducted position. This movement is essential for functions that require pinching and gripping. The adductor pollicis is also involved in the later stages of opposition of the thumb, which is the movement of the thumb towards the side of the palm.
The adductor pollicis is comprised of two heads: the transverse head and the oblique head. This muscle extends from the third metacarpal and capitate bones to the base of the first proximal phalanx. The muscle ends in a tendon that contains a sesamoid bone and inserts onto the base of the first proximal phalanx as well as its extensor hood.
The adductor pollicis muscle is innervated by the ulnar nerve. The ulnar nerve provides motor innervation to the majority of the intrinsic hand muscles. The deep branch of the ulnar nerve, along with the deep palmar arch and radial artery, pass through a passageway formed by the two heads of the adductor pollicis.
Ulnar nerve palsy is a complication of ulnar nerve injury, which can cause extreme motor weakness or atrophy of the muscles innervated by the nerve, including the adductor pollicis. This can result in an "ulnar claw" deformity, where the fingers are pulled towards the palm due to the absence of the function of the lumbrical muscles. Froment's sign is used to test for a compromised adductor pollicis muscle in ulnar nerve palsy, where the patient grasps a sheet of paper between the thumb and index finger, and the distal phalanx of the thumb is flexed rather than kept straight.
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Frequently asked questions
The adductor pollicis muscle is the muscle that adducts the thumb, i.e., moves the thumb towards the index finger from an abducted position.
The adductor pollicis is a large, triangular, intrinsic muscle of the hand. It has two heads: transverse and oblique.
The main function of the adductor pollicis muscle is the adduction of the thumb. This action is essential for functions that require pinching and gripping.
