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Muscle medial rotation is an anatomical term used to describe the movement of limbs around their long axis. It is also referred to as internal rotation. Medial rotation of the hip, for example, involves rotating a straight leg so that the toes point inward. Similarly, medial rotation of the shoulder involves rotating the arm, with the elbow at a 90-degree angle, and bringing the hand towards the opposite hip. This movement is dependent on the degree of abduction at the shoulder. Medial rotation is often associated with muscles such as the subscapularis, which is the largest component of the posterior wall of the axilla and plays a crucial role in preventing the anterior dislocation of the humerus during abduction and medial rotation.
| Characteristics | Values |
|---|---|
| Definition | Medial rotation is a rotational movement of the limbs towards the midline of the body. |
| Other Names | Internal rotation |
| Examples | Pointing toes inward with a straight leg; rotating the arm with a 90-degree elbow, bringing the hand towards the opposite hip |
| Body Parts Involved | Shoulder, hip, fingers, toes |
| Muscles Involved | Deltoid, pectoralis and teres majors, subscapularis, latissimus dorsi, supraspinatus, infraspinatus, teres minor |
| Nerves Involved | Axillary nerve, subscapular nerve |
| Related Movements | Adduction is the movement that brings the limb towards the midline of the body; abduction moves the limb away from the midline |
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What You'll Learn
- Medial rotation is a movement towards the midline of the body
- It is sometimes referred to as internal rotation
- The subscapularis muscle is the largest component of the posterior wall of the axilla and is involved in medial rotation
- Medial rotation can occur at the shoulder, hip, elbow, knee, wrist, metacarpophalangeal, metatarsophalangeal, and interphalangeal joints
- Medial rotation is the opposite of lateral rotation, which is a rotational movement away from the midline
Medial rotation is a movement towards the midline of the body
Medial and lateral rotation describe the movement of limbs around their long axis. The terms medial and lateral rotation are often confused with elevation and depression. Elevation refers to movement in a superior direction (e.g. a shoulder shrug), while depression refers to movement in an inferior direction.
Medial rotation can be further understood in contrast to abduction and adduction. Abduction and adduction motions occur within the coronal plane and involve medial-lateral motions of the limbs, fingers, toes, or thumb. Abduction moves the limb laterally away from the midline of the body, while adduction is the opposing movement that brings the limb toward the body or across the midline.
Medial rotation occurs at the ball-and-socket joints of the shoulder and hip. Here, the humerus and femur rotate around their long axis, which moves the anterior surface of the arm or thigh either toward or away from the midline of the body. Medial rotation is produced by the contraction of muscles such as the subscapularis, which is the largest component of the posterior wall of the axilla and prevents the anterior dislocation of the humerus during abduction and medial rotation.
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It is sometimes referred to as internal rotation
Medial rotation is a rotational movement of the limbs towards the midline of the body. It is sometimes referred to as internal rotation.
To understand this, consider two scenarios. In the first scenario, imagine standing with your leg straight. When you rotate your leg to point your toes inward, this is medial rotation of the hip. In the second scenario, imagine carrying a tea tray in front of you, with your elbow bent at a 90-degree angle. Now, rotate your arm, bringing your hand towards your opposite hip while keeping your elbow at the same angle. This is internal rotation of the shoulder.
Medial rotation can also be observed in the shoulder and hip joints, where the humerus and femur rotate around their long axis, moving the anterior surface of the arm or thigh towards the midline of the body. This movement is in contrast to lateral (external) rotation, where the anterior surface moves away from the midline.
The subscapularis muscle, a part of the rotator cuff in the shoulder, is responsible for medial (internal) rotation of the shoulder. Weakness or paralysis when rotating the shoulder medially under resistance can indicate axillary nerve impairment.
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The subscapularis muscle is the largest component of the posterior wall of the axilla and is involved in medial rotation
Medial and lateral rotation describe the movement of limbs around their long axis. Medial rotation is a rotational movement towards the midline of the body, while lateral rotation is the opposite, moving away from the midline. In the context of the fingers and toes, medial and lateral rotation are described in relation to the midline of the hand and foot, respectively.
The subscapularis muscle is the largest component of the posterior wall of the axilla. It is part of the rotator cuff, a group of muscles in the shoulder that enable a wide range of movement while maintaining the stability of the glenohumeral joint. The subscapularis muscle contributes to the stability of the shoulder joint, particularly during overhead movements of the arm, such as throwing or pulling downwards. It also helps coordinate the movements of the glenohumeral and scapulothoracic joints.
The subscapularis muscle is involved in medial rotation, also known as internal rotation. It is the only medial rotator among the rotator cuff muscles. This muscle rotates the arm medially at the shoulder joint. The precise action of the subscapularis is to internally rotate the arm on the shoulder joint. Specifically, it medially rotates the humeral head within the glenoid fossa.
The subscapularis muscle originates from the anterior surface of the scapula and inserts into the lesser tuberosity of the humerus. It is innervated by the upper and lower subscapular nerves, which are branches of the posterior cord of the brachial plexus. The blood supply to the subscapularis muscle comes from branches of the subclavian artery, including the axillary artery, subscapular artery, and suprascapular artery.
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Medial rotation can occur at the shoulder, hip, elbow, knee, wrist, metacarpophalangeal, metatarsophalangeal, and interphalangeal joints
Medial rotation is a rotational movement towards the midline of the body. It is sometimes referred to as internal rotation. To understand this, consider the following scenarios:
Firstly, with a straight leg, rotate it to point the toes inward. This is medial rotation of the hip. Secondly, imagine you are carrying a tea tray in front of you, with your elbow at a 90-degree angle. Now, rotate your arm, bringing your hand towards your opposite hip (elbow still at 90 degrees). This is internal rotation of the shoulder.
Shoulder and Hip
Medial and lateral rotation can only occur at the multiaxial shoulder and hip joints. At these ball-and-socket joints, the humerus and femur rotate around their long axis, moving the anterior surface of the arm or thigh either toward or away from the midline of the body.
Elbow
Flexion at the elbow is the decreasing of the angle between the ulna and the humerus. Extension at the elbow is the reverse movement, increasing the angle between the ulna and the humerus.
Knee
The knee joint allows for medial and lateral rotation, which is the inward or outward rotation of the tibia in relation to the femur. This motion can also contribute to the abduction or adduction of the foot.
Wrist, Metacarpophalangeal, and Interphalangeal Joints
Abduction and adduction at the wrist move the hand away from or toward the midline of the body. The same is true for the fingers and toes, where abduction spreads them out, and adduction brings them together.
The metacarpophalangeal joint is the connection between the palm and the fingers. Flexion and extension are considered the primary movements of this joint. The full range of motion for the thumb MCP joint is about 60 degrees, which is almost completely flexion. The second MCP joint is the only one that experiences medial rotation, while the third to the fifth MCP joints experience lateral rotation.
Metatarsophalangeal
Abduction and adduction motions occur within the coronal plane and involve medial-lateral motions of the limbs, fingers, toes, or thumb. Abduction moves the limb laterally away from the midline of the body, while adduction is the opposing movement that brings the limb toward the body or across the midline.
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Medial rotation is the opposite of lateral rotation, which is a rotational movement away from the midline
Medial and lateral rotation describe the movement of limbs around their long axis. Medial rotation is a rotational movement towards the midline of the body, and is sometimes referred to as internal rotation. To understand this, imagine two scenarios:
Firstly, with a straight leg, rotate it to point the toes inward. This is medial rotation of the hip. Secondly, imagine carrying a tea tray with your elbow at a 90-degree angle. Now rotate your arm, bringing your hand towards your opposite hip (while keeping your elbow at 90 degrees). This is internal rotation of the shoulder.
Lateral rotation is the opposite of medial rotation and is a rotational movement away from the midline of the body. In other words, it is the reverse of the movements described above. For example, if you were to rotate your straight leg outward, pointing the toes away from the body's midline, this would be lateral rotation of the hip. Similarly, if you were to rotate your arm outward, away from your body, this would be lateral rotation of the shoulder.
Medial and lateral rotation can be confusing, but the key difference is the direction of the movement in relation to the body's midline. Medial rotation brings the anterior surface of the limb towards the midline, while lateral rotation moves the anterior surface away from the midline. These terms are specifically used for movements at the multiaxial shoulder and hip joints.
The rotator cuff, a group of muscles in the shoulder, enables a wide range of movements while maintaining the stability of the glenohumeral joint. The subscapularis muscle, for instance, is responsible for medial (internal) rotation of the shoulder. The infraspinatus muscle, on the other hand, is a powerful lateral rotator of the humerus.
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Frequently asked questions
Muscle medial rotation is the movement of a limb toward the midline of the body. It is sometimes referred to as internal rotation.
Medial rotation of the hip can be observed by rotating a straight leg so that the toes point inward. Similarly, medial rotation of the shoulder can be observed by holding your arm out in front of you with your elbow at a 90-degree angle and then rotating your arm so that your hand moves toward your opposite hip.
The muscles involved in medial rotation of the shoulder include the deltoid, pectoralis and teres majors, subscapularis, and latissimus dorsi. The subscapularis is the largest component of the posterior wall of the axilla and is considered part of the rotator cuff, a group of muscles that allow a wide range of movement while maintaining the stability of the glenohumeral joint.
Muscle medial rotation can be evaluated through a variety of tests. For example, the subscapularis muscle is evaluated using the "lift-off" and "bear hug" tests, while the infraspinatus muscle is evaluated by performing lateral rotation against resistance with the elbow flexed and the arm in a neutral abduction/adduction position.
