Dominic Stone
Flexor muscles are muscles 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 essential in movement and help maintain stability and posture. For instance, hip flexors are a group of muscles that flex the hip and raise the legs. These muscles are used every time a person stands or takes a step. The flexor digitorum superficialis muscle is another example of a flexor muscle, which flexes the middle phalanges of the medial four digits at the proximal interphalangeal joints.
| Characteristics | Values |
|---|---|
| Definition | A muscle that contracts to perform flexion, a movement that decreases the angle between the bones converging at a joint. |
| Example | The elbow joint flexes when one brings their hand closer to the shoulder, thus decreasing the angle between the upper arm and the forearm. |
| Hip flexors | A group of muscles responsible for flexing the hip and raising the legs. |
| Hip flexor muscles | Psoas major, iliacus, pectineus, adductor longus, brevis, glutei (medius and minimus). |
| Function | Help maintain stability and posture. |
| Weak hip flexors | May cause pain in the lower back, hip, and knee. |
| Weak hip flexor muscles | More prone to strain. |
| Flexor digitorum superficialis | Flexes the middle phalanges of the medial four digits at the proximal interphalangeal joints. |
| Flexes the proximal phalanges at the metacarpophalangeal joints and the wrist joint. | |
| Receives innervation by the median nerve (C7, C8, and T1). | |
| Has several physiological anomalies, including those involving muscle belly, presence of additional accessory tendons, duplicate tendons, and variant tendon-tendon anastomoses. |
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What You'll Learn
Hip flexors
Flexor muscles are muscles that contract to perform flexion, a movement that decreases the angle between the bones converging at a joint. Hip flexors are a group of muscles responsible for flexing the hip and raising the legs. They are essential for movement as they are used every time a person stands or takes a step. They also help to maintain stability and posture.
The hip flexors are made up of five different muscles: the psoas major, the iliacus, the rectus femoris, the sartorius, and the pectineus. The psoas major is a deep muscle that connects the legs to the spine. It runs from the lower back to the pelvis and passes to the front of the hip, attaching to the top of the femur (thigh bone). The iliacus is a muscle that rests deep within the pelvis and attaches to the femur. The rectus femoris is one of the quadriceps and has two functions: to flex at the hip and extend the knee. The sartorius is the longest muscle in the body, crossing the hip and knee joints. It functions to flex the hip and externally rotate the leg. The pectineus acts as a hip flexor and secondary adductor, originating on the superior pubic ramus and inserting on the pectineal line of the femur.
It is important to keep the hip flexor muscles strong and flexible through regular movement and muscle conditioning. Weak and tight hip flexors are common in people who lead sedentary lifestyles and sit for extended periods. This can cause pain in the lower back, hip, and knee due to overworked joints compensating for deficient muscles. It can also lead to changes in posture and gait, and a higher risk of strain or injury.
To strengthen the hip flexors, various stretches and exercises can be performed, such as the bridge pose in yoga, lunges, glute bridges, planks, crunches, and clamshells.
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Flexor digitorum superficialis
In anatomy, a flexor muscle is a muscle that contracts to perform flexion, a movement that decreases the angle between the bones converging at a joint. For example, one's elbow joint flexes when one brings their hand closer to the shoulder, thus decreasing the angle between the upper arm and the forearm.
The tendons of the flexor digitorum superficialis are enclosed, along with those of the flexor digitorum profundus, by a common flexor sheath. The tendons attach to the anterior margins on the bases of the intermediate phalanges of the four fingers. These tendons have a split (Camper's Chiasm) at the end of them through which the tendons of the flexor digitorum profundus pass. The flexor digitorum superficialis muscle is innervated by the median nerve. The primary function of the flexor digitorum superficialis 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.
To test flexor digitorum superficialis, one finger is flexed at the proximal interphalangeal joint against resistance while the remaining three fingers are held fully extended (to inactivate flexor digitorum profundus). Another test is Modified Baker's test, in which the examiner asks the subject to flex the proximal interphalangeal joint of the little finger alone while the other fingers are held extended. Then the little and ring fingers are released to flex together to observe the improvement in the PIP joint flexion.
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Flexor digitorum profundus
Flexor muscles are muscles 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 a person brings their hand closer to the shoulder, thus decreasing the angle between the upper arm and the forearm.
The flexor digitorum profundus (FDP) is a muscle in the forearm that flexes 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 most powerful and most bulky muscle of the forearm. It is also known as the perforating muscle because, while the flexor digitorum superficialis attaches more proximally, the profundus's tendons go through the tendons of the superficialis and attach to the distal phalanx.
The FDP is a composite muscle with dual innervation. The medial aspect of the muscle, which flexes the fourth and fifth digits, is supplied by the ulnar nerve, while the lateral aspect, which flexes the second and third digits, is supplied by the median nerve. The FDP is the chief gripping muscle, acting most effectively when the wrist is extended. It is the sole flexor of the distal interphalangeal (DIP) joint of the second to fifth 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.
The FDP is one of the deep muscles of the anterior compartment (deep volar compartment) of the forearm. It originates in the upper three-quarters of the anterior and medial surfaces of the ulna, the interosseous membrane, the deep fascia of the forearm, the coronoid process of the ulna, and the aponeurosis of the flexor carpi ulnaris muscle. The FDP gives off a broad tendon at the distal third of the forearm, which enters the hand by passing beneath the flexor retinaculum. The tendon then splits into four slips that attach to the palmar surfaces of the bases of the distal phalanges of the second to fifth digits.
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Flexion of the hip joint
Flexor muscles are muscles that contract to perform flexion, a movement that decreases the angle between the bones converging at a joint. The hip joint is a multiaxial joint that permits a wide range of motion, including flexion, extension, abduction, adduction, external rotation, internal rotation, and circumduction.
Hip flexor muscles are essential in movement, as they are used every time a person stands, walks, or runs. They also help maintain stability and posture. The hip flexors consist of five key muscles that contribute to hip flexion: iliacus, psoas, pectineus, rectus femoris, and sartorius. The psoas major is a deep muscle that connects the legs to the spine, running from the lower back to the pelvis and attaching to the top of the femur (thigh bone). The iliacus muscle rests deep within the pelvis and also attaches to the femur.
The prime movers for hip flexion are the psoas major muscle and the iliacus muscle. The psoas muscle contracts when the hip is flexed, and the two muscles are often grouped together as the iliopsoas musculotendinous unit due to their overlapping function and anatomic proximity. The iliopsoas has the largest bursa in the body, which lies between the iliopsoas and the hip capsule/pubis.
Hip flexion occurs when the thigh is drawn towards the trunk, as in a high, forward kick that brings the leg above the waist level. The range of movement during passive flexion is about 120 degrees, and it reaches around 145 degrees during active flexion. Hip flexion is limited by the tension in the hamstrings when the knee is extended.
It is important to keep hip flexor muscles strong through regular conditioning to avoid injuries and ensure overall muscle and postural health. Individuals with a sedentary lifestyle are at a high risk of developing short and tight hip flexors, which can lead to pain in the lower back, hip, and knee due to overworked joints. Strengthening exercises for the hip flexors include the bridge pose and lunges.
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Flexor muscles of the forearm
Flexor muscles are muscles that contract to perform flexion, a movement that decreases the angle between the bones converging at a joint. For example, one's elbow joint flexes when one brings their hand closer to the shoulder, thus decreasing the angle between the upper arm and the forearm.
The forearm is the section of the upper limb from the elbow to the wrist, whose bony structure is formed by the radius (laterally) and ulna (medially). The forearm contains twenty muscles that act on the elbow and wrist joints, as well as carpometacarpal, metacarpophalangeal, and interphalangeal joints of the hand. The forearm 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 from this group are innervated by the median nerve, except for the flexor carpi ulnaris muscle that is innervated by the ulnar nerve. All of the muscles in this compartment work together to produce movements of the hand and digits. More specifically, they are in charge of flexion, adduction, and abduction of the hand in the wrist joint, as well as flexion of the fingers at the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints.
The flexor digitorum superficialis is the only muscle of the intermediate compartment. It can sometimes be classed as a superficial muscle, but in most individuals, it lies between the deep and superficial muscle layers. The muscle is a good anatomical landmark in the forearm – the median nerve and ulnar artery pass between its two heads, and then travel posteriorly. It has two heads – one originates from the medial epicondyle of the humerus, the other from the radius. The muscle splits into four tendons at the wrist, which travel through the carpal tunnel and attach to the base of the middle phalanx of the four digits. It flexes the metacarpophalangeal joints and proximal interphalangeal joints at the 4 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 (FDP) tendons then enter the A1 pulley of the fibro-osseous tunnel. At the level of the proximal phalanx, the FDP tendon passes through the split of the FDS and inserts on the base of the distal phalanges. The FDP muscle primarily flexes the DIP joints of the fingers but also contributes to the flexion of the PIP, MCP, and wrist joints.
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Frequently asked questions
Flexor muscles are muscles that contract to perform flexion, a movement that decreases the angle between the bones converging at a joint.
Examples of flexor muscles include the flexor digitorum superficialis and the flexor digitorum profundus. The flexor digitorum superficialis flexes the middle phalanges of the medial four digits at the proximal interphalangeal joints. The flexor digitorum profundus flexes the digits slowly.
Hip flexor muscles are a group of muscles responsible for flexing the hip and raising the legs. They include the psoas major and iliacus muscles.
Hip flexor muscles are essential in movement as they are used every time a person stands or takes a step. They also help maintain stability and posture. Weak hip flexor muscles can lead to pain in the lower back, hip, and knee, as well as changes in posture and gait. Weak hip flexor muscles are also more prone to strain and injury. To keep them strong, it is recommended to do stretches and exercises such as the bridge pose and lunges.
