WebOct 27, 2024 · Pectoralis Major. The musculus pectoralis is the most superficial muscle within the pectoral region. it’s large and fan-shaped, and consists of a sternal head and a clavicular head:. Attachments: Both heads distally attach to the intertubercular sulcus of the humerus. Clavicular head – That has origin from the anterior surface of the medial clavicle. WebJul 25, 2024 · The function of the pectoralis major is 3-fold and dependent on which heads of muscles are involved. [1][2] Flexion, adduction and medial rotation of the arm at the glenohumeral joint Clavicular head causes flexion of the extended arm Sternoclavicular head causes extension of the flexed arm
Assessment and Treatment of the Pectoralis Major and …
WebMay 23, 2024 · Pectoralis major is one of the muscles that move the humerus at the shoulder joint. It’s a broad, powerful muscle and the larger of the two pectoralis muscles . … WebNov 8, 2024 · Knowing where pectoralis (pec) major is located, how it moves the surrounding bones, and what exercises strengthen it is essential for exercise programming. Pec major is a large muscle in the upper body that influences shoulder movement, upper torso function, and breathing. Most personal trainers and clients have an idea of where … c3 corvette front sway bar
Pectoralis minor muscle: Origin, insertion and action
WebApr 12, 2024 · Fixation of the attachment sites- Fixation of upper 8-9 ribs (origin) Fixation of scapula (insertion) What are the actions of the serratus anterior muscle when the origin (upper 8-9 ribs) is fixed? ... What are the actions of only the lower pectoralis major muscle fibers? Extend the shoulder-(i.e., extend shoulder from flexed position) WebDec 26, 2024 · The pectoralis major (L. pectus, chest ; major, larger.) is a large, fan-shaped chest muscle. It acts on the shoulder and (indirectly on) the scapula, with its most prominent role being the prime mover in … WebJan 11, 2024 · Injury of the pectoralis major can occur at the muscle origin, muscle belly, musculotendinous junction, intratendinous region, and/or humeral insertion—with or without bone avulsion. The extent of the tendon injury ranges from partial to complete tears. c3 corvette front sway bar installation