What muscle extends adducts and rotates arm medially at the shoulder?

Latissimus dorsi extends, adducts and medially rotates the arm. It also draws the shoulder downward and backward and keeps the inferior angle of the scapula against the chest wall.

What muscle can extend adduct and medially rotate the shoulder?


Muscle Origin Action
Supraspinatus Supraspinous Fossa of the Scapula Abduction of the Shoulder
Teres Major Inf. Angle of Scapula Extension, Adduction & Medial Rotation
Infraspinatus Infraspinous Fossa Lateral Rotation of the Shoulder
Teres minor Lateral border of scapula Lateral rotation of the shoulder

Which muscle extends the shoulder and medially rotates the arm?

The deltoid, the thick muscle that creates the rounded lines of the shoulder is the major abductor of the arm, but it also facilitates flexing and medial rotation, as well as extension and lateral rotation. The subscapularis originates on the anterior scapula and medially rotates the arm.

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What muscle allows for extension adduction and medial rotation of the arm?

Attachments: The latissimus dorsi originates from the lower spine and ribs and the upper pelvis and fascia of the deep trunk muscles. The muscle converges into a tendon attaching to the humerus. Actions: Extends, adducts, and medially rotates the upper arm.

Which muscle adducts the arm at the shoulder?

Adduction is accomplished primarily by the pectoralis major, latissimus dorsi, teres major, triceps, and coracobrachialis. The deltoid and the supraspinatus, a muscle that runs along the scapula in the back, are the two main abductors of the shoulder.

What muscle medially rotates shoulder?

The deeper subscapularis medially rotates the shoulder with help from the more superficial teres major, latissimus dorsi and anterior fibers of the deltoid. The supraspinatus originates in the supraspinous fossa, which means superior to the spine of the scapula.

What muscles medially rotate the humerus?

The subscapularis, along with the teres major, another intrinsic muscle that is not part of the rotator cuff, and extrinsic muscles like the pectoralis major and latissimus dorsi, is responsible for medial, or internal, rotation of the arm.

What muscle extends and abducts the hand at the wrist?

Summary table

Muscle Origin Action
Extensor carpi radialis brevis common extensor tendon extends, abducts wrist
Extensor digitorum extends fingers, wrist
Extensor digiti minimi extends little finger at all joints
Extensor carpi ulnaris common extensor tendon, ulna extends, adducts wrist

What flexes and adducts the arm?

Finally, the coracobrachialis flexes and adducts the arm. The tendons of the deep subscapularis, supraspinatus, infraspinatus, and teres minor connect the scapula to the humerus, forming the rotator cuff (musculotendinous cuff), the circle of tendons around the shoulder joint.

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What is a medial rotation?

In anatomy, internal rotation (also known as medial rotation) is an anatomical term referring to rotation towards the center of the body.

Which of the following muscles does not medially rotate the arm?

The supraspinatus muscle is the only muscle of the rotator cuff that is not a rotator of the humerus. The infraspinatus is a powerful lateral rotator of the humerus.

Which muscle is responsible for adduction and internal rotation of the arm?

The latissimus dorsi muscle at the level of the shoulder is the most important internal rotator, as it is the most important for the adduction and flexion of the shoulder. It’s a fusiform muscle. The pectoralis major muscle helps flexion, internal rotation, and adduction on a horizontal plane.

What muscle abducts and rotates the thigh?

The sartorius flexes, abducts, and laterally rotates the thigh at the hip joint. It also aids in the flexion of the knee joint and the medial rotation of the leg in this position. The sartorius is a long band-like muscle that runs lateral to medial, crossing the anterior aspect of the thigh.

What muscles extend the arm?

Triceps brachii.

This muscle, usually referred to as your triceps, runs along your humerus and allows for the flexion and extension of your forearm.

What muscles abduct the humerus?

Muscles: supraspinatus (initiates abduction – first 15 degrees), deltoid (up to 90 degrees), trapezius and serratus anterior (scapular rotation, for abduction beyond 90 degrees). The deltoid muscle abducts the arm, but at 90 degrees the humerus bumps into the acromion.

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What is a shoulder extension?

Shoulder extension, on the other hand, refers to the position you make when you move your arm and stick them out on your back. The muscles affected by these movements are the coracobrachialis, pectoralis major, and the anterior deltoid.