The pectoralis major extends across the upper part of the chest and is attached to a ridge at the rear of the humerus (the bone of the upper arm). Its major actions are adduction, or depression, of the arm (in opposition to the action of the deltoideus muscle) and rotation of the arm forward about the axis of the body.
Why pectoralis minor is key muscle?
Function. Pectoralis muscle has several functions, mostly related to the movement of the scapula. Together with the serratus posterior it acts in protraction of the scapula, i.e. moving it laterally and anteriorly against the ribcage. This movement is important in reaching the arm forward.
What is the trapezius action?
The function of the trapezius is to stabilize and move the scapula. The upper fibers can elevate and upwardly rotate the scapula and extend the neck. The middle fibers adduct (retract) the scapula. The lower fibers depress and aid the upper fibers in upwardly rotating the scapula.
What is the latissimus dorsi action?
Latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity. Together, these muscles will work to adduct, medially rotate and extend the arm at the glenohumeral joint.
Where does pectoralis minor attach?
The pectoralis minor lies, for the most part, beneath the pectoralis major, arising from the middle ribs and inserting into (attaching to) the scapula (shoulder blade). It aids in drawing the shoulder forward and downward (in opposition to the trapezius muscle).
What is the action of the sternocleidomastoid?
Function. Rotation of the head to the opposite side or obliquely rotate the head. It also flexes the neck. When acting together it flexes the neck and extends the head.
What does the rhomboid minor do?
Together with the rhomboid major, the rhomboid minor retracts the scapula when trapezius is contracted. Acting as a synergist to the trapezius, the rhomboid major and minor elevate the medial border of the scapula medially and upward, working in tandem with the levator scapulae muscle to rotate the scapulae downward.
What is the action of the deltoid muscle?
Deltoid muscle functions include: Arm abduction, which means raising your arm out to the side of your body. Compensation for lost arm strength if you have an injury, such as a rotator cuff tear. Flexion (moving your arm forward, toward an overhead position) and extension (moving your arm backward, behind your body).
What are the 3 main functions of the latissimus dorsi?
The latissimus dorsi assists in depression of the arm with the teres major and pectoralis major. It adducts, extends, and internally rotates the shoulder.
What is the action and innervation of the latissimus dorsi?
Functionally, the latissimus dorsi muscle belongs to the muscles of the scapular motion. This muscle is able to pull the inferior angle of the scapula in various directions, producing movements on the shoulder joint; internal rotation, adduction and extension of the arm.
What is the origin insertion and action of the latissimus dorsi?
Latissimus Dorsi is one of four muscles responsible for the thoracobrachial motion. It is large, flat and triangular in shape originating from large parts of the lumbar region and lower thorax to insert on the humerus through a narrow tendon.
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