Logan Steele
Flexor muscles are those that decrease the angle between bones on two sides of a joint, allowing for bending at the elbow, knee, wrist, and fingers. They are responsible for movements like bending the elbow to bring the hand closer to the shoulder and bending the knee. Flexor muscles are essential for maintaining balance and posture, and they play a crucial role in everyday activities like standing and walking. Examples of flexor muscles include the iliopsoas, which enables flexion in a sitting position, and the sartorius, which is the longest muscle in the body and is responsible for flexing and moving the knee and leg.
| Characteristics | Values |
|---|---|
| Definition | Muscles that decrease the angle between bones on two sides of a joint |
| Movement | Bending of the elbow, knee, wrist, fingers, hip, and spine |
| Examples | Flexor carpi radialis, flexor carpi ulnaris, flexor digitorum profundus, flexor digitorum superficialis, flexor pollicis longus, flexor hallucis brevis, flexor hallucis longus, iliopsoas, sartorius, pectineus, adductor longus, adductor brevis, glutei, lumbrical muscles |
| Function | Flexion, abduction, extension, rotation, stability, posture, balance |
| Symptoms of Injury | Pain, swelling, bruising, cramping, muscle spasms, loss of function |
| Treatment | Restraint from physical activity, stretching, strengthening exercises |
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What You'll Learn
Hip flexors
Flexor muscles are those that decrease the angle between bones on two sides of a joint, causing a bending movement. For example, the bending of the elbow and knee are instances of flexion.
People who sit down for most of the day have shorter hip flexor muscles, tilting the pelvis, and changing how a person walks. Sitting for long periods causes the hip flexors to shorten and tighten up, and this can lead to functional problems. For example, shortened muscles cannot generate as much power as lengthened muscles. Sitting for long periods is also associated with weakness in the hip muscles, including the hip flexors, and this can cause lower back pain, hip pain, and injury.
To keep the hip flexors supple, it is recommended to get up and move more throughout the day. Changing position every 30 to 45 minutes can help to avoid tightness. There are also various hip flexor stretches that can be performed to relieve tightness and increase flexibility and mobility in the hip flexors.
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Forearm flexors
The forearm is the section of the upper limb between the elbow and the wrist. The forearm contains twenty muscles that act on the elbow and wrist joints, as well as the carpometacarpal, metacarpophalangeal, and interphalangeal joints of the hand. These muscles are divided into two compartments: the anterior flexor compartment and the posterior extensor compartment.
The superficial anterior forearm muscles are a group of five muscles located in the anterior (flexor) compartment of the forearm. These muscles include the pronator teres, flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and flexor digitorum superficialis. The majority of muscles in this group are innervated by the median nerve, except for the flexor carpi ulnaris muscle, which is innervated by the ulnar nerve.
The flexor carpi radialis is a fusiform muscle situated medially to the pronator teres muscle. It originates from the medial epicondyle of the humerus and extends into a long tendon that passes beneath the flexor retinaculum and inserts onto the bases of the metacarpal bones 2 and 3. The contraction of the flexor carpi radialis produces movements of the hand at the wrist joint, including wrist flexion and wrist abduction.
The flexor carpi ulnaris is the most medial muscle of this group and originates by two heads: humeral and ulnar. The tendon from these heads inserts onto the pisiform and hamate bones and the base of the metacarpal bone 5. The flexor carpi ulnaris is the only muscle in this group that is innervated by the ulnar nerve, and it contributes to the flexion of the hand at the wrist joint.
The flexor digitorum superficialis is the only muscle of the intermediate compartment and can be classed as either a superficial or deep muscle. It has two heads that originate from the medial epicondyle of the humerus and the shaft of the radius. The muscle splits into four tendons at the wrist, which attach to the base of the middle phalanx of the four digits. It flexes the metacarpophalangeal joints and proximal interphalangeal joints at the four fingers and flexes at the wrist.
There are three muscles in the deep anterior forearm: flexor digitorum profundus, flexor pollicis longus, and pronator quadratus. The flexor digitorum profundus is the only muscle that can flex the distal interphalangeal joints of the fingers. It also flexes at the metacarpophalangeal joints and at the wrist. The flexor pollicis longus is innervated by the median nerve and the anterior interosseous nerve.
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Elbow and knee flexors
A flexor muscle is one that contracts to perform flexion, a movement that decreases the angle between the bones converging at a joint. The bending of the elbow and knee are examples of flexion.
Elbow Flexors
The main elbow flexors include the biceps brachii, the brachialis, and the brachioradialis, with the pronator teres acting as a secondary flexor. The brachioradialis has a lengthy origin along the lateral supracondylar bony column, extending proximally to the level of the junction of the midhumerus and distal humerus. It crosses the elbow joint with the greatest mechanical advantage of any elbow flexor. The extensor carpi radialis brevis and the extensor carpi radialis longus have also been implicated in elbow flexion.
Knee Flexors
The knee flexors include the set of hamstrings, gracilis, sartorius, gastrocnemius, plantaris, and popliteus. The hamstrings are the primary knee flexors and they also perform hip extension. The gracilis and sartorius flex and internally rotate the knee, providing stability to the medial side of the knee. The gastrocnemius produces large plantar flexion torques across the ankle, and as the muscle crosses the posterior aspect of the knee, it is also a knee flexor. The plantaris is also a flexor of the knee.
Flexor Muscle Groups
Flexor muscles can be grouped into long flexors and shorter flexors. The long flexors include the flexor digitorum superficialis, the flexor digitorum profundus, and the flexor pollicis longus. These run to the metacarpals and phalanges. The shorter flexors are found more distally.
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Iliopsoas muscles
Flexor muscles are those that contract to perform flexion, or the bending of a joint. The iliopsoas muscle is the major flexor of the hip joint, formed by the iliacus, the psoas major, and sometimes the psoas minor. These muscles work together to flex the hip, stabilise the hip and lower back, and assist in external rotation of the hip joint. The psoas minor is only present in 60-65% of individuals.
The iliopsoas muscle is essential for correct sitting and standing lumbar posture, and it is crucial during walking and running. The iliopsoas originates from different places in the pelvic area and lumbar spine, which means it functions in different ways. When the iliopsoas contracts on one side of the body, it assists in lateral flexion, or side-bending, of the lower spine. When one foot is on the ground and the other in the air, as in walking, the iliopsoas contracts to stabilise the pelvis, hip, and lumbar spine.
The iliopsoas muscle gets its nerve supply from the femoral nerve at lumbar levels two, three, and four. The psoas major is innervated by direct branches of the lumbar plexus, specifically from L1-L3. The psoas minor receives nerve supply from lumbar level one. The iliopsoas gets its blood supply from the iliolumbar artery, which arises from the internal iliac artery.
The iliopsoas tendon can develop tendinopathy, which can cause pain and reduced function. Impingement of the iliopsoas tendon can also cause chronic groin pain and limited hip range of movement. Iliopsoas bursitis involves the expansion of the bursa due to synovial fluid and/or hypertrophic synovium.
In summary, the iliopsoas muscle is a powerful flexor of the hip joint, essential for correct posture and movement, and supported by a network of nerves and blood vessels.
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Flexor digitorum superficialis
Flexor muscles are muscles that contract to perform flexion, a movement that decreases the angle between the bones converging at a joint. An example of flexion is the bending of the elbow or knee.
The flexor digitorum superficialis (FDS) is a flexor muscle of the fingers at the proximal interphalangeal joints. It is the largest muscle of the anterior compartment of the forearm. It is sometimes considered to be the deepest part of the superficial layer of this compartment, and sometimes considered to be a distinct, "intermediate layer". The FDS is relatively common to be missing from the little finger, which can cause problems when diagnosing a little finger injury.
The FDS has two heads: the humeroulnar and radial. Its large muscular belly courses distally towards the wrist, where it splits into four tendons and attaches to the middle phalanges of the second through fifth digits of the hand. The tendons of the superficial layer are directed to digits 3 and 4, while the tendons of the deep layer insert into digits 2 and 5. The FDS is innervated by the median nerve.
The primary function of the FDS is flexion of the middle phalanges of the four fingers (excluding the thumb) at the proximal interphalangeal joints. However, under continued action, it also flexes the metacarpophalangeal joints and wrist joint.
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Frequently asked questions
Flexor muscles are the muscles that decrease the angle between bones on two sides of a joint, allowing for bending. This includes muscles in the hand and legs, such as the flexor carpi radialis and flexor carpi ulnaris, which stretch from the upper arm to flex the wrist.
Some examples of flexor muscles include the iliopsoas, which is necessary for flexion in a sitting position, and the sartorius, which is the longest muscle in the body and is responsible for flexing and moving the knee and leg. Other examples include the flexor digitorum superficialis and flexor digitorum profundus, which are responsible for bending the fingers.
Weak hip flexor muscles can lead to pain in the lower back, hip, and knee due to overworked joints compensating for deficient muscles. It can also result in changes in posture and gait, and weak hip flexors are more prone to strain and injury.
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