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The flexor digitorum profundus is a powerful finger flexor that pulls the lateral four digits (the second to the fifth fingers) towards the hand. It is one of two flexor muscles that is not supplied by the median nerve. It is also known as flexor digitorum communis profundus and is considered an extrinsic hand muscle. The flexor digitorum profundus has long tendons that run from the forearm down through the carpal tunnel and attach to the palmar side of the phalanges of the fingers.
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What You'll Learn
- The flexor digitorum profundus muscle is a powerful flexor of the 5th finger
- The flexor digitorum profundus is one of two flexor muscles supplied by the median nerve
- The flexor digitorum profundus muscle is located in the forearm
- The flexor digitorum profundus is the main gripping muscle
- The flexor digitorum profundus works with the lumbrical muscles to flex the interphalangeal joints
The flexor digitorum profundus muscle is a powerful flexor of the 5th finger
The flexor digitorum profundus is a powerful muscle that flexes the fingers. It is an extrinsic hand muscle, meaning it acts on the hand while its muscle belly is located in the forearm. It is one of the deep muscles of the anterior compartment (deep volar compartment) of the forearm. It is also known as the perforating muscle because its tendons go through the tendons of the flexor digitorum superficialis.
The flexor digitorum profundus is the chief gripping muscle and acts best when the wrist is extended. It is the sole flexor of the distal interphalangeal (DIP) joint of the 2nd to 5th digits. It also acts as a flexor of the midcarpal (wrist), metacarpophalangeal, and proximal interphalangeal (PIP) joints of the index, middle, ring, and little fingers, along with the flexor digitorum superficialis. The flexor digitorum profundus is also involved in the flexion of the 5th finger, pulling the distal phalanx towards the hand, causing flexion of the 5th digit at the metacarpophalangeal and interphalangeal joints.
The muscle originates in the upper 3/4 of the anterior and medial surfaces of the ulna, interosseous membrane, and deep fascia of the forearm. It then fans out into four tendons, one for each of the second to fifth fingers, attaching to the palmar base of the distal phalanx. The tendon of the flexor digitorum profundus to the 5th finger may be interconnected with the separate tendon that runs to the index finger, which may lead to a weak grasp and an inability to make a full fist.
The flexor digitorum profundus is one of two flexor muscles that is not exclusively supplied by the median nerve. It is a hybrid muscle supplied by two different nerves: the medial half (associated with the ring and little fingers) is innervated by the ulnar nerve, while the lateral half (associated with the middle and index fingers) is innervated by the median nerve.
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The flexor digitorum profundus is one of two flexor muscles supplied by the median nerve
The flexor digitorum profundus is a powerful flexor muscle that pulls the lateral four digits towards the hand, causing flexion of the digits 2-5 at the metacarpophalangeal and interphalangeal joints. It is one of the deep muscles of the anterior compartment (deep volar compartment) of the forearm. It is the main gripping muscle and acts optimally when the wrist is extended.
The flexor digitorum profundus is a hybrid muscle supplied by two different nerves. The median nerve travels between the flexor digitorum superficialis and the flexor digitorum profundus in the forearm. The lateral part, which inserts into the second and third digits, is innervated by the median nerve via the anterior interosseous branch. The medial half, associated with the ring and little fingers, is innervated by the ulnar nerve. The anterior interosseous nerve supplies the flexor digitorum profundus, flexor pollicis longus, and pronator quadratus muscles in the forearm.
The flexor digitorum profundus has long tendons that run down the arm and through the carpal tunnel, attaching to the palmar side of the phalanges of the fingers. The muscle fans out into four tendons, one for each of the second to fifth fingers, attaching to the palmar base of the distal phalanx. The muscle fibres are arranged so that the medial part of the muscle inserts into digits 4 and 5, while the lateral part inserts into digits 2 and 3.
The flexor digitorum profundus is also known as the perforating muscle because its tendons pass through the tendons of the flexor digitorum superficialis before attaching to the distal phalanx. This muscle works in synergy with the flexor digitorum superficialis, lumbricals, and flexor digiti minimi brevis muscles to flex the fingers.
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The flexor digitorum profundus muscle is located in the forearm
The flexor digitorum profundus (FDP) is a powerful finger flexor muscle that originates in the forearm of humans. It is one of the deep muscles of the anterior compartment (deep volar compartment) of the forearm. The muscle fans out into four tendons, which attach to the distal phalanx of the 2nd to 5th digits. The FDP is the chief gripping muscle, acting optimally when the wrist is extended. It is the sole flexor of the distal interphalangeal (DIP) joint of the 2nd to 5th digits.
The FDP is considered an extrinsic hand muscle as it acts on the hand while its muscle belly is located in the forearm. The muscle originates from four sites: the superior three-quarters of the anterior and medial surfaces of the ulna, the adjacent part of the interosseous membrane, the coronoid process of the ulna, and the aponeurosis of the flexor carpi ulnaris muscle. From this broad origin, the FDP takes an inferior course towards the hand, giving off a broad tendon at the distal third of the forearm. This tendon crosses the superficial surface of the pronator quadratus and enters the hand by passing beneath the flexor retinaculum.
The FDP is one of two flexor muscles not exclusively supplied by the median nerve. The median nerve travels distally between the flexor digitorum superficialis and the FDP. The FDP is also supplied by the ulnar nerve, which innervates the medial half of the muscle associated with the ring and little fingers. The FDP tendon of the index finger often has a separate muscle belly, while the tendons to the 5th, 4th, and 3rd fingers share a common muscle belly. This anatomical arrangement may result in the inability to make a full fist and a weak grasp in some patients.
The FDP works in conjunction with the flexor digitorum superficialis to flex the fingers. The FDP lies deep to the superficialis, attaching more distally. Thus, the FDP tendons perforate the tendons of the superficialis to attach to the distal phalanx. This unique arrangement gives the FDP its alternative name, the perforating muscle. The FDP also aids the lumbrical muscles in their role as extensors of the interphalangeal joints, transferring power to fully extend the fingers and flex the metacarpophalangeal joints.
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The flexor digitorum profundus is the main gripping muscle
The flexor digitorum profundus is a powerful finger flexor that pulls the lateral four digits towards the hand, causing flexion of the second to fifth digits at the metacarpophalangeal and interphalangeal joints. It is one of the deep muscles of the anterior compartment (deep volar compartment) of the forearm. It is the main gripping muscle because its tendons arise at or below the wrist joint, allowing it to act as the mass action muscle that provides the primary gripping power of the hand.
The flexor digitorum profundus is one of two flexor muscles that is not exclusively supplied by the median nerve. It is supplied by two different nerves: the medial half (associated with the ring and little fingers) is innervated by the ulnar nerve, while the other tendons are supplied by the median nerve. The median nerve travels distally between the flexor digitorum profundus and the flexor digitorum superficialis.
The flexor digitorum profundus originates in the upper three-quarters of the anterior and medial surfaces of the ulna, the interosseous membrane, the deep fascia of the forearm, and the aponeurosis of the flexor carpi ulnaris muscle. From this broad origin, the muscle takes an inferior course towards the hand, giving off a broad tendon at the level of the distal third of the forearm. This tendon crosses the superficial surface of the pronator quadratus and enters the hand by passing beneath the flexor retinaculum.
The flexor digitorum profundus fans out into four tendons, one for each of the second to fifth fingers, which attach to the palmar base of the distal phalanx. These tendons are long, running down the arm and through the carpal tunnel before attaching to the distal phalanx. This distinguishes the flexor digitorum profundus from the flexor digitorum superficialis, which attaches to the middle phalanx. The flexor digitorum profundus is also known as the perforating muscle because its tendons go through the tendons of the flexor digitorum superficialis.
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The flexor digitorum profundus works with the lumbrical muscles to flex the interphalangeal joints
The flexor digitorum profundus (FDP) is a powerful finger flexor that pulls the lateral four digits (second to fifth fingers) towards the hand, causing flexion at the metacarpophalangeal and interphalangeal joints. It is one of the deep muscles of the anterior compartment (deep volar compartment) of the forearm, acting as the main gripping power of the hand. The FDP tendon perforates the tendon of the flexor digitorum superficialis, attaching to the palmar base of the distal phalanx. The FDP is also known as the perforating muscle due to its distal attachment.
The FDP is a hybrid or composite muscle supplied by two different nerves. The medial half, associated with the ring and little fingers, is innervated by the ulnar nerve, while the lateral half, associated with the second and third digits, is innervated by the median nerve via the anterior interosseous branch. The muscle originates from four sites: the superior three-quarters of the anterior surface of the ulna, the adjacent part of the interosseous membrane, the coronoid process of the ulna, and the aponeurosis of the flexor carpi ulnaris muscle. From this broad origin, the FDP takes an inferior course towards the hand, giving off a broad tendon that crosses the superficial surface of the pronator quadratus.
The FDP works in synergy with the lumbrical muscles, which attach to the deep surfaces of its tendons. The lumbricals are intrinsic muscles that originate on the palmar side of the hand and attach to the dorsal aponeurosis. By working together, the FDP aids the lumbricals in their role as extensors of the interphalangeal joints, transferring power to fully extend the fingers and flex the metacarpophalangeal joints. This synergy is crucial for establishing and maintaining a strong grip.
However, it is important to note that the FDP tendons to the fifth, fourth, and third fingers share a common muscle belly. This interconnectedness may limit their independent movement, potentially affecting the patient's ability to make a full fist and leading to a weak grasp. This condition is known as quadrigia and can occur due to adhesion or scarring after rupture and repair of the FDP tendon.
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Frequently asked questions
The flexor digitorum profundus muscle is a powerful finger flexor that pulls the lateral four digits ?(2nd to 5th fingers) towards the hand.
The flexor digitorum profundus acts as the main gripping power of the hand. It is also the sole flexor of the distal interphalangeal (DIP) joint of the 2nd to 5th fingers.
The flexor digitorum profundus is located in the forearm. It originates in the upper 3/4 of the anterior and medial surfaces of the ulna, interosseous membrane, and deep fascia of the forearm.
Both muscles are flexors of the fingers, but the profundus lies deeper and attaches more distally than the superficialis. The profundus is also known as the perforating muscle because its tendons go through those of the superficialis.
Each finger has two muscles involved in flexion: the flexor digitorum profundus and the flexor digitorum superficialis. The lumbrical muscles also aid in finger flexion by originating on the palmar side of the hand and attaching on the dorsal aponeurosis.
