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Flexor muscles are those that contract to perform flexion, a movement that decreases the angle between the bones converging at a joint. For example, the elbow joint flexes when the hand is brought closer to the shoulder, decreasing the angle between the upper arm and forearm. Flexor muscles are located in various parts of the body, including the wrist, hand, fingers, forearm, hip, foot, and toes. These muscles are responsible for movements such as bending the elbow or knee, flexing the wrist, and making a fist.
| Characteristics | Values |
|---|---|
| Definition | Muscles that contract to perform flexion, a movement that decreases the angle between the bones converging at a joint |
| Examples | Flexor carpi radialis, flexor carpi ulnaris, flexor digitorum profundus, flexor digitorum superficialis, flexor digitorum longus, flexor digitorum brevis, flexor hallucis longus, flexor hallucis brevis, flexor digiti minimi brevis pedis, iliopsoas, pectineus, adductor longus, adductor brevis, glutei, flexor pollicis longus, pronator quadratus, palmaris longus, pronator teres |
| Location | Forearm, hand, wrist, hip joint, foot, elbow, knee |
| Function | Flexion of the hand, wrist, fingers, toes, hip joint, elbow, knee |
| Innervation | Median nerve, ulnar nerve |
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What You'll Learn
Forearm, hand and wrist
The forearm is the section of the upper limb from the elbow to the wrist. It is formed by the radius and ulna. The forearm muscles are divided into two compartments: the anterior flexor compartment and the posterior extensor compartment. Together, they contain twenty muscles that act on the elbow and wrist joints, as well as the carpometacarpal, metacarpophalangeal, and interphalangeal joints of the hand.
The anterior flexor compartment contains muscles that perform flexion and pronation at the wrist, and flexion of the fingers. The deep muscles in this compartment include the flexor pollicis longus, flexor digitorum profundus, and pronator quadratus. This muscle group is associated with pronation of the forearm, flexion of the wrist, and flexion of the fingers. The flexor pollicis longus, for example, translates to "long muscle that flexes the thumb". The superficial muscles in the anterior compartment include the flexor carpi ulnaris, palmaris longus, flexor carpi radialis, and pronator teres.
The forearm flexor muscles that power the tendons that insert on the metacarpals and phalanges to provide wrist and finger flexion originate on the medial aspect of the elbow. They are divided into three anatomical layers. The superficial layer of muscles consists of the pronator teres, flexor carpi radialis, flexor carpi ulnaris, and palmaris longus. The intermediate muscle group is the flexor digitorum superficialis. The deep muscle group consists of the flexor digitorum profundus and the flexor pollicis longus.
The wrist is a complex joint that allows for various movements, including flexion and extension. The primary set of wrist flexors includes the flexor carpi radialis, flexor carpi ulnaris, and, when present, palmaris longus. The tendons of these muscles can be easily identified on the anterior distal wrist, especially during strong isometric activation.
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Hip joint
Hip flexor muscles are a group of muscles that allow you to bend your hips. They are responsible for bringing your legs and trunk together in a flexion movement. This means that they draw the upper leg and torso together at the hip joint.
Hip flexor muscles are easy to overuse and strain, and they can be injured when placed under extreme stress from explosive movements like jumping or running. They can also be strained or torn by sudden movements or falls. Hip flexor strain can be caused by overuse, leading to partial tears, or by sudden injury. It is important to stretch the hip flexors before exercise or strenuous activity to prevent strain. Stretching these muscles will also increase their length and help prevent injury.
Hip flexor strain usually causes pain in the front of the hip, near the groin. Pain is typically felt deep in the front of the hip region, and it may be worse during or after activity if there is a strain. Mild strains may take a few weeks to heal, while severe strains can take up to six weeks or more to recover fully.
The hip flexors consist of five key muscles that contribute to hip flexion: iliacus, psoas, pectineus, rectus femoris, and sartorius. The psoas major muscle is a long, tapering muscle that originates at either side of the spine and inserts at the lesser trochanter of the femur. The rectus femoris is a powerful hip flexor, although it is dependent on the position of the knee and hip. The iliopsoas is another powerful hip flexor that begins in two distinct regions proximally. The iliacus has a broad origin, arising from the inner table of the iliac wing, the sacral alae, and the iliolumbar and sacroiliac ligaments.
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Foot
The flexor digitorum longus is a long, thin muscle that belongs to the deep posterior muscles of the leg. It is situated on the tibial side of the leg and arises from the posterior surface of the tibia. This muscle is responsible for plantar flexion and inversion of the foot.
The flexor digitorum longus muscle functions to flex the second, third, fourth, and fifth toes. This movement allows the toes to grip the floor, which is important for maintaining balance on uneven surfaces. The muscle is divided into four tendons that insert into the bases of the distal phalanges of the lateral four digits.
The flexor digitorum longus muscle is located in the deep posterior leg compartment, along with the flexor hallucis longus, tibialis posterior, and popliteus muscles. It is separated from the superficial layer of muscles in the posterior leg compartment by the deep fascia of the leg. The flexor digitorum longus sits posteriorly to the tibia and tibialis posterior muscle and is medial to the flexor hallucis longus.
The flexor digitorum longus muscle acts on four different joints: the talocrural (ankle joint), talocalcaneal (subtalar joint), metatarsophalangeal, and interphalangeal joints. It is crucial for the gait cycle, as it flexes the four lateral toes when the foot is off the ground. When the foot is placed on the ground, this muscle works with the lumbrical and interossei muscles to maintain balance by keeping the toes in firm contact with the ground.
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Elbow
The elbow flexor is a muscle that bends the arm at the elbow joint. The main elbow flexors are the biceps brachii, the brachialis, and the brachioradialis, with the pronator teres acting as a secondary flexor. The biceps brachii is a major flexor of the elbow that has a large cross-sectional area but an intermediate mechanical advantage because it passes relatively close to the axis of rotation. The brachialis is the primary flexor of the elbow and is located in the anterior compartment of the arm, along with the biceps brachii and coracobrachialis. It has a large cross-sectional area, providing it with more strength than the biceps brachii and the coracobrachialis. The brachialis can be injured by repetitive forceful contractions or muscular contractions with the arm in hyperextension, such as in climbing, where the hand is in pronation and the extended starting position.
The common flexor origin of the elbow refers to the attachment of the flexor-pronator muscles at the medial epicondyle of the distal humerus. The pronator teres, which possesses both humeral and ulnar heads, originates from the medial epicondyle and coronoid process of the ulna. The two heads join together and insert along the middle of the lateral surface of the radius. The pronator teres is a strong forearm pronator, generating its highest contractile force during rapid or resisted pronation. The flexor carpi radialis and brachioradialis also act as secondary pronators.
The forearm is divided into two compartments by deep fascia: the anterior compartment, which contains the flexor muscles, and the posterior compartment, which contains the extensor muscles. The forearm bones, the ulna and radius, articulate with each other in two locations. The head of the radius forms a joint with the radial notch of the ulna proximally (proximal radioulnar joint), while the head of the ulna forms a joint with the ulnar notch of the radius distally (distal radioulnar joint). These joints, along with the humeroradial joint, allow the pronation and supination movements of the forearm.
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Wrist joint
The wrist is a complex joint formed by the connection of the radius and ulna (the two bones in the forearm) to the carpals in the hand. The wrist has eight small bones, with the scaphoid bone being the most commonly fractured. Tendons connect the muscles to the bone, and in the case of the wrist, these tendons are very long and slender, making them susceptible to injury.
The wrist flexor muscles are a group of muscles located on the anterior (front) side of the forearm that are responsible for flexing the wrist joint, allowing the wrist to bend downwards. The primary wrist flexor muscles include the flexor carpi radialis, flexor carpi ulnaris, palmaris longus (not always present in everyone), flexor digitorum superficialis (also flexes the fingers), and flexor digitorum profundus (also flexes the fingers).
The flexor digitorum superficialis is the only muscle of the intermediate compartment and can be considered a good anatomical landmark in the forearm. It splits into four tendons at the wrist, travelling through the carpal tunnel and attaching to the base of the middle phalanx of the four digits.
The forearm flexor muscles that power these tendons originate on the medial aspect of the elbow and are divided into three anatomical layers. The superficial layer of muscles consists of the pronator teres, flexor carpi radialis, flexor carpi ulnaris, and palmaris longus. The intermediate muscle group is the flexor digitorum superficialis, and the deep muscle group consists of the flexor digitorum profundus and the flexor pollicis longus.
Strong wrist flexor muscles are important for performing everyday activities such as lifting objects, gripping, typing, and writing. They also provide stability to the wrist joint, which is crucial for weight-bearing activities and pushing or pulling objects. Additionally, strengthening these muscles can help prevent injuries and aid in rehabilitation after wrist injuries or surgeries.
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Frequently asked questions
Flexor muscles are located in various parts of the body, including the forearm, wrist, hand, fingers, hip, foot, and toes.
Some examples of flexor muscles in the forearm include the flexor digitorum superficialis, flexor digitorum profundus, and flexor pollicis longus.
The flexor muscles in the forearm are responsible for flexion of the wrist and fingers, allowing for movements such as making a fist or bending the elbow.
Yes, there are six long flexor muscles that originate in the forearm but have tendon attachments in the hand. These include the flex carpal radialis, flexor carpal ulnaris, flexor pollicis longus, and flexor digitorum profundus.
Flexor muscles generally produce stronger contractions than extensor muscles, as it is relatively easier to open a hand than to grip something firmly. Flexor muscles decrease the angle between bones at a joint, such as bending the elbow or knee.
