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The upper and lower fibers tend to rotate the scapula around the sternoclavicular articulation so that the acromion and inferior angles move up and the medial border moves down (upward rotation). The upper and lower fibers work in tandem with serratus anterior to upwardly rotate the scapulae, and work in opposition to the levator scapulae and ...
[1] [2] [3] The rhomboid major, rhomboid minor, and levator scapulae muscles are transferred laterally along the scapula to replace the functions of the lower, middle, and upper fibers of the trapezius, respectively. The transferred muscles hold the scapula in a more medial and upwardly rotated position, without winging.
True abduction: supraspinatus (first 15 degrees), deltoid; Upward rotation: trapezius, serratus anterior Arm adduction [14] Arm adduction is the opposite motion of arm abduction. It can be broken down into two parts: downward rotation of the scapula and true adduction of the arm.
The scapula (pl.: scapulae or scapulas [1]), also known as the shoulder blade, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone). Like their connected bones, the scapulae are paired, with each scapula on either side of the body being roughly a mirror image of the other.
Iliac crest, lumbar fascia, spines of lower six thoracic vertebrae, lower 3-4 ribs, inferior angle of scapula Floor of bicipital groove of humerus Teres major: Lower third of lateral border of scapula: Medial lip of bicipital groove of humerus Teres minor: Upper two thirds of lateral border of scapula Greater tubercle of humerus Lateral rotation
Costal aspect of medial margin of the scapula: Artery: Lateral thoracic artery, superior thoracic artery (upper part), thoracodorsal artery (lower part) Nerve: Long thoracic nerve (from roots of brachial plexus C5-C7) Actions: Protracts and stabilizes scapula, assists in upward rotation. Antagonist: Rhomboid major, rhomboid minor, trapezius ...
The lower sternal fibers of the pectoralis major also perform this role of extension and adduction to a lesser degree. The contraction of these adductor/extensor muscles can indirectly depress and downwardly rotate the scapulae; this is only required when they are pulled into elevation and upward rotation by the contraction of muscles that ...
These muscles are responsible for several actions of the glenohumeral joint. The third group, which is mainly responsible for stabilization and rotation of the scapula, consists of the trapezius, serratus anterior, levator scapulae, and rhomboid muscles and attach to the medial, superior, and inferior borders of the scapula.