Logan Steele
There are many muscles in the human body, each with its own unique name and function. For example, the muscle that lies over the head of the humerus and abducts, flexes, and extends the shoulder is called the deltoid. Another example is the biceps brachii, which is responsible for elbow flexion. The triceps brachii, on the other hand, is the prime mover of elbow extension. The masseter muscle is responsible for closing the jaw, and the gastrocnemius muscle allows us to stand on tiptoe when the knee is extended. These are just a few examples of the muscles that are highlighted and studied in anatomy and physiology.
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What You'll Learn
Forearm muscle flexor carpi radialis
The flexor carpi radialis is a muscle in the human forearm that acts to flex and radially abduct the hand. The Latin root 'carpus', meaning wrist, gives the muscle its name. It is one of four muscles in the superficial layer of the anterior compartment of the forearm.
The flexor carpi radialis originates from the medial epicondyle of the humerus, via the common flexor tendon, and surrounding fascia. This common flexor tendon is a common origin for the six long flexor muscles in the forearm, including the flexor carpi radialis, palmaris longus, flexor carpi ulnaris, pronator teres, and flexor digitorum superficialis and profundus. The muscle belly courses obliquely, crossing from the ulnar to the radial part of the forearm. In the lower third of the forearm, it gives off a long tendon that passes below the flexor retinaculum into the palmar surface of the hand.
The tendon of the flexor carpi radialis is visible on the anterior surface of the forearm, just proximal to the wrist, when the wrist is flexed. It is the tendon seen most lateral, closest to the thumb. The muscle is supplied by a branch arising high in the forearm from the anterior or posterior recurrent ulnar arteries, with the rest of its nutritional needs fulfilled by 6-8 branches of the radial artery.
The flexor carpi radialis is responsible for wrist flexion and abduction. It pulls the hand proximally and laterally, producing the combined motion of wrist flexion and wrist abduction (radial deviation). It acts in synergy with the flexor carpi ulnaris and palmaris longus to produce a balanced flexion of the hand, and with the extensor carpi radialis longus and brevis to produce a balanced hand abduction.
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Shoulder and back muscles
The shoulder and back muscles are a complex network of muscles that work together to provide stability, strength, and a range of motions. These muscles are responsible for various functions and movements in the upper body and are susceptible to injuries due to their frequent use.
The back muscles start just under the skull, covering the shoulders, and running down to just above the hips. They are divided into three groups: superficial (extrinsic), intermediate, and intrinsic (deep) back muscles. The superficial back muscles include the latissimus dorsi, levator scapulae, rhomboids, and trapezius. These muscles are responsible for repositioning the torso and moving the shoulders. The intermediate back muscles, which include the serratus posterior superior and serratus posterior inferior, are located just above and below the ribcage and assist in moving the ribs during breathing. The intrinsic back muscles are the deepest layer, situated close to the spine.
The shoulder muscles are skeletal muscles that attach the upper limb to the axial skeleton of the trunk. They can be grouped into anterior axio-appendicular muscles and posterior axio-appendicular muscles. The anterior group includes the pectoralis major, pectoralis minor, subclavius, and serratus anterior. The pectoralis major, with its three heads (clavicular, sternocostal, and abdominal), enables adduction and internal rotation of the arm. The posterior group includes the deltoid, teres major, and the muscles of the rotator cuff, such as the supraspinatus, infraspinatus, teres minor, and subscapularis. The rotator cuff muscles are crucial for lifting, rotating, and stabilising the arm, while the deltoid muscle helps move the arm forward, backward, and to the side.
The shoulder and back muscles work in harmony to enable various tasks, such as reaching for an item on a shelf or pushing open a door. They are susceptible to injuries, especially with overuse or repetitive motions. Common conditions include shoulder impingement syndrome, strains, and rotator cuff injuries. Strengthening and conditioning these muscles can help improve performance and reduce the risk of injuries.
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Elbow flexion
There are three muscles involved in elbow flexion: the brachialis, brachioradialis, and biceps brachii. These muscles are responsible for the movement of the elbow joint, allowing it to flex and extend. The brachialis is the largest and strongest flexor muscle of the three, providing elbow flexion at all physiologic positions. It originates from the distal anterior humerus and inserts onto the ulnar tuberosity. The brachialis is considered a pure flexor as it does not provide any supination or pronation of the forearm.
The brachioradialis, on the other hand, attaches to the humerus and the radius bone in the forearm. It works alongside the biceps brachii, which attaches to the shoulder blade and the radius, to produce supination. These muscles crossing the elbow act as dynamic stabilizers, enhancing the geometric stability of the joint.
Impaired elbow flexion can be caused by various factors, including injury, inflammation, or broken bones. In some cases, repetitive motions at work or during hobbies can lead to conditions such as tendonitis, bursitis, or nerve entrapment. Treatment options may include conservative approaches such as physical therapy, occupational therapy, stretches, and exercises. In more severe cases, bracing or surgery may be required.
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Wrist abduction
The primary muscles responsible for wrist abduction are the flexor carpi radialis, the extensor carpi radialis longus, and the extensor carpi radialis brevis. These muscles play a crucial role in facilitating the abduction movement of the wrist.
The flexor carpi radialis is a muscle that contributes to wrist abduction by causing flexion and abduction towards the radial side of the wrist. It attaches to the base of metacarpals II and III and is one of the muscles in the anterior superficial layer of the forearm.
The extensor carpi radialis longus and brevis, on the other hand, function together to produce wrist extension and abduction, also towards the radial side of the forearm. These muscles are located in the forearm and can be palpated in the upper lateral portion of the posterior forearm during wrist extension and abduction movements. The tendon of the extensor carpi radialis longus can be specifically felt in the floor of the anatomical snuff box during these movements.
Additionally, the extensor carpi ulnaris also contributes to wrist abduction by extending the wrist. It attaches to metacarpal V and originates from the lateral epicondyle of the humerus.
By understanding the roles of these muscles in wrist abduction, we can appreciate the complex coordination required to achieve this movement, which is essential in various daily activities and sports.
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Hip abduction
The primary hip abductor muscles include the gluteus medius, gluteus minimus, and tensor fasciae latae. The gluteus medius is the prime mover of abduction at the hip joint and is located on the lateral aspect of the upper buttock, below the iliac crest. The gluteus minimus is the smallest of the three gluteal muscles and lies deep beneath the gluteus medius. The tensor fasciae latae, or TFL, is another significant contributor to hip abduction.
Secondary hip abductors include the piriformis, sartorius, and superior fibers of the gluteus maximus. The gluteus maximus is the largest and heaviest muscle in the body and is located at the posterior aspect of the hip joint. The sartorius is the longest muscle in the human body, running over the hip and knee joints.
Weak hip abductors can lead to pelvic instability during walking and standing on one leg, resulting in conditions like Trendelenburg gait. Weakness in these muscles can also cause pain and improper movement, especially in the knees. Hip abduction exercises are important for strengthening these muscles and improving stability and injury prevention.
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Frequently asked questions
Splenius Capitis, Trapezius, Infraspinatus, and Supraspinatus.
Rectus Abdominis.
Latissimus Dorsi, External Oblique, Deltoid, and Teres Major.
Levator Scapulae, Sternocleidomastoid, Upper Fibres of Trapezius, and Serratus Anterior.
