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The flexor digitorum profundus is a muscle in the forearm that is responsible for flexing the fingers. It is an extrinsic hand muscle, with its muscle belly located in the forearm. The flexor digitorum profundus is the most powerful and bulky muscle of the forearm, and it plays a crucial role in establishing and maintaining a strong grip of the hand. This muscle is also known as the deep bender of the fingers in Latin, reflecting its function in finger flexion. The profundus muscle has a dual innervation, with different parts of the muscle being supplied by the ulnar and median nerves.
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What You'll Learn
The flexor digitorum profundus is a forearm muscle
The flexor digitorum profundus (FDP) is a forearm muscle in humans that is responsible for flexing the fingers. It is an extrinsic hand muscle, with its muscle belly located in the forearm. The name 'flexor digitorum profundus' is derived from Latin, meaning 'deep bender of the fingers'.
The flexor digitorum profundus is a fusiform muscle located deep within the anterior (flexor) compartment of the forearm. It is part of the deep flexor compartment of the forearm, along with the flexor pollicis longus and pronator quadratus muscles. The muscle extends from the proximal part of the ulna to the distal phalanges of the 2nd to 5th digits. Its primary function is to flex the fingers at the metacarpophalangeal and interphalangeal joints, while also assisting in flexion of the hand at the wrist.
The FDP is a powerful flexor of the fingers, pulling the distal phalanges towards the hand and causing flexion of the digits 2-5. It is considered the chief gripping muscle, particularly effective when the wrist is extended. The FDP is a hybrid or composite muscle, receiving dual innervation from the ulnar and median nerves. The medial part of the muscle, which inserts into the fourth and fifth digits, is innervated by the ulnar nerve, while the lateral part, inserting into the second and third digits, is innervated by the median nerve via the anterior interosseous branch.
The FDP is an important muscle for establishing and maintaining a strong grip of the hand. It also aids in the full extension of the fingers at the interphalangeal joints, working in conjunction with the lumbrical muscles. The FDP is susceptible to injuries such as Quadrigia and Jersey finger, which can affect the patient's ability to make a full fist and weaken their grip.
The FDP is a long muscle that attaches to the distal phalanx, passing through the carpal tunnel and ending deep to the flexor digitorum superficialis. Its tendons fan out into four tendons, attaching to the palmar base of the second to fifth fingers. The muscle is supplied by the anterior interosseous artery, a branch of the common interosseous artery.
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It is an extrinsic hand muscle
The flexor digitorum profundus (FDP) is an extrinsic hand muscle that flexes the metacarpophalangeal (MCP) and distal interphalangeal (DIP) joints of the medial 4 fingers. This muscle originates from the upper three-fourths of the volar and medial surfaces of the ulna, interosseous membrane, and deep forearm fascia. The FDP is located deep within the anterior (flexor) compartment of the forearm. It is considered an extrinsic hand muscle because it acts on the hand while its muscle belly is located in the forearm.
The FDP tendons insert on the bases of the medial 4 distal phalanges, deep to the flexor digitorum superficialis (FDS) tendons. The medial 3 FDP tendons are partially attached as they pass through the carpal tunnel. The FDP tendon of the index finger separates from its medial 3 counterparts proximal to the flexor retinaculum. The FDP is a powerful flexor of the fingers, pulling the distal phalanges towards the hand and causing flexion of the digits 2-5 at the MCP and interphalangeal joints.
The FDP is a hybrid or composite muscle as it is innervated by two different nerves. The medial part of the muscle, which inserts into the fourth and fifth digits, is innervated by the ulnar nerve, while the lateral part, which inserts into the second and third digits, is innervated by the median nerve via the anterior interosseous branch. The FDP is supplied by the inferior ulnar collateral and ulnar recurrent arteries at its origin, with the rest of the muscle vascularized by branches of the ulnar, anterior interosseous, and median arteries.
The FDP is the chief gripping muscle, acting best when the wrist is extended. It is the only muscle that can flex the DIP joints of the medial 4 fingers. The FDP also assists in flexing the hand at the wrist, working alongside other flexor muscles to enable a strong grip. The FDP's long tendons run down the arm and through the carpal tunnel, attaching to the palmar side of the phalanges of the fingers. The lumbricals, intrinsic hand muscles, attach to the FDP tendon and aid in extending the interphalangeal joints and flexing the MCP joints.
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It is a powerful flexor of the fingers
The flexor digitorum profundus (FDP) muscle is a powerful flexor of the fingers, or digits. It is a muscle in the forearm that is responsible for flexing the distal phalanges of the fingers, with different parts of the muscle being innervated by the ulnar and median nerves.
The FDP is an extrinsic hand muscle, meaning it acts on the hand while its muscle belly is located in the forearm. It is a fusiform muscle located deep within the anterior (flexor) compartment of the forearm. It is considered the chief gripping muscle and acts best when the wrist is extended.
The FDP is a hybrid or composite muscle, as it is innervated by two different nerves. The medial part of the muscle, which inserts into the fourth and fifth digits, is innervated by the ulnar nerve, while the lateral part, which inserts into the second and third digits, is innervated by the median nerve via the anterior interosseous branch.
The FDP is the only muscle that can flex the distal phalanges of the medial four digits at the distal interphalangeal (DIP) joints. It also assists in flexing the hand at the midcarpal (wrist) and metacarpophalangeal (MCP) joints. This muscle is crucial for establishing and maintaining a strong grip of the hand.
The FDP tendons attach to the bases of the distal phalanges, deep to the flexor digitorum superficialis (FDS) tendons. The FDP tendon of the index finger often has a separate muscle belly and separates from the other three tendons proximal to the flexor retinaculum. The FDP tendons arise at or distal to the wrist joint, allowing for a powerful grip.
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It is a hybrid muscle supplied by two nerves
The flexor digitorum profundus is a hybrid muscle supplied by two nerves. It is a powerful flexor of the fingers, pulling the distal phalanges towards the hand and causing flexion of the digits 2-5 at the metacarpophalangeal and interphalangeal joints. The medial part of the muscle, which inserts into the fourth and fifth digits, is innervated by the ulnar nerve (C8-T1). The lateral part, which inserts into the second and third digits, is innervated by the median nerve, specifically the anterior interosseous branch (C8-T1).
The flexor digitorum profundus is the most powerful and bulky muscle of the forearm. It is located deep within the anterior (flexor) compartment of the forearm and extends from the proximal part of the ulna to the distal phalanges of the 2nd to 5th digit. It is an extrinsic hand muscle, acting on the hand while its muscle belly is located in the forearm. This is why it is considered a hybrid or composite muscle.
The flexor digitorum profundus is also an accessory wrist flexor, aiding other muscles in flexing the hand at the wrist joint. This function is important for establishing and maintaining a strong grip of the hand. The muscle is named from the Latin 'deep bender of the fingers', reflecting its role in finger flexion.
The lumbricals, intrinsic muscles of the hand, attach to the flexor digitorum profundus tendon. This allows the flexor muscle to aid the lumbricals in their role as extensors of the interphalangeal joints. The tension generated by the flexor digitorum profundus at the more distal joints is determined by wrist position, with flexion of the wrist reducing tension.
The flexor digitorum profundus is supplied by the inferior ulnar collateral and ulnar recurrent arteries at its origin. The superior part of the muscle belly is supplied by either the ulnar artery or its branch, the common interosseous artery. The rest of the muscle is vascularized by branches of the ulnar, anterior interosseous, and median arteries.
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It is the main gripping power of the hand
The flexor digitorum profundus (FDP) is a muscle in the forearm that is responsible for flexing the fingers. It is considered an extrinsic hand muscle because it acts on the hand while its muscle belly is located in the forearm. The FDP is the main gripping power of the hand. It acts best when the wrist is extended. It is the sole flexor of the distal interphalangeal (DIP) joint of the second to fifth digits.
The FDP is a powerful flexor of the fingers. As it pulls the distal phalanges towards the hand, it causes flexion of the digits 2-5 at the metacarpophalangeal and interphalangeal joints. The FDP also assists in flexing the hand on the wrist. This muscle extends from the proximal part of the ulna to the distal phalanges of the 2nd to 5th digit. Its main action is flexion of the fingers at the metacarpophalangeal and interphalangeal joints. However, it also assists in flexion of the hand on the wrist.
The FDP is a hybrid or composite muscle as it is innervated by two different nerves. The medial part of the muscle, which inserts into the fourth and fifth digits, is innervated by the ulnar nerve. The lateral part, which inserts into the second and third digits, is innervated by the median nerve via the anterior interosseous branch. The FDP is supplied by the inferior ulnar collateral and ulnar recurrent arteries at its origin. The superior part of the muscle belly is supplied either by the ulnar artery or by its branch, the common interosseous artery.
The FDP tendons attach distally to the bases of the distal phalanges of the medial four digits. The lumbricals arise from the FDP tendons and insert into the dorsal extensor expansions of the proximal phalanges. The FDP flexes the distal phalanges of the medial four digits at the DIP joints and is the only muscle that can do so. The FDP also assists in flexing the hand. This long muscle's attachment to the lumbricals allows it to aid the latter in fully extending the interphalangeal (IP) joints and flexing the MCP joints.
The FDP muscle is important in the diagnosis and treatment of certain medical conditions. For example, in ulnar nerve injuries, the function of the FDP is evaluated to determine the level of injury. In the case of ulnar entrapment at the elbow, the FDP muscle tends to be preserved while other hand intrinsic muscles are affected. Additionally, injuries to the FDP tendon can result in a condition called Jersey finger, characterised by the loss of active flexion of the distal interphalangeal joint.
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Frequently asked questions
The flexor digitorum profundus muscle is a muscle in the forearm that is responsible for flexing the fingers.
The profundus muscle is located deep within the anterior (flexor) compartment of the forearm.
The function of the profundus muscle is to flex the distal phalanges of the fingers, with different parts of the muscle being innervated by the ulnar and median nerves.
The profundus muscle originates from the upper three-fourths of the anterior and medial surfaces of the ulna, interosseous membrane, and deep forearm fascia.
The tendons of the profundus muscle attach to the palmar surfaces of the bases of the distal phalanges of digits 2-5.
