Pectoralis major: Origin, insertion, innervation,function - Kenhub
2023年11月3日 · Acting independently, the clavicular part helps to flex the extended arm up to 90°, while the sternocostal part facilitates the extension of the flexed arm by pulling it downwards. In this article, we will discuss the anatomy and function of the pectoralis major muscle.
Pectoralis major - Wikipedia
The function of the pectoralis major is different for its different heads. The clavicular head flexes the humerus, and the sternocostal head adducts the humerus. As a whole the action is to adduct and medially rotate the humerus. It also draws the scapula anteriorly and inferiorly.
Pectoralis major - Physiopedia
The function of the pectoralis major is 3-fold and dependent on which heads of muscles are involved. With the origin fixed, the pectoralis major adducts, medially rotates, and transversely adducts arm at glenohumeral joint. It assists in flexion of the arm (via its clavicular head)
Muscles of the Pectoral Region - Major - Minor - TeachMeAnatomy
2024年9月6日 · Pectoralis Major. The pectoralis major is the most superficial muscle in the pectoral region. It is large and fan shaped, and is composed of a sternal head and a clavicular head: Attachments: Clavicular head – originates from the anterior surface of the medial clavicle.
Pectoralis Major | UW Radiology - University of Washington
Pectoralis Major Origin: Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle
Pectoralis Major - Attachments - Actions - TeachMeAnatomy
2022年10月7日 · The pectoralis major is a muscle of the anterior chest wall. It is a large fan-shaped muscle, which is composed of a sternal head and a clavicular head. Attachments: Clavicular head originates from the anterior surface of the medial clavicle.
Pectoralis Major: Anatomy, Function, and Treatment - Verywell …
2023年9月7日 · The muscle has two heads: the clavicular head and the sternocostal head. The clavicular head originates from the front of your collar bone (medial clavicle), then continues down your upper arm bone (humerus) where it attaches at the intertubercular sulcus.
Clavicular head of pectoralis major muscle - e-Anatomy - IMAIOS
The clavicular head of the pectoralis major muscle originates from the medial half of the clavicle. It is one of the two heads of the pectoralis major (other is the sternocostal head, with also an abdominal part of pectoralis major).
Pectoralis major (clavicular head) - Pocket Anatomy
Clavicular head: Medial half of anterior surface of clavicle. Sternocostal head: Anterior surface of manubrium, sternum, upper six costal cartilages and external oblique aponeurosis. Insertion: Lateral lip of intertubercular groove of humerus. Key Relations:
Pectoralis Major: Origin, Insertion, Action, Innervation, Diagram
2023年5月5日 · The clavicular head helps flex the arm at the shoulder joint from its resting position. As an antagonist to this movement, the sternocostal head helps extend the arm back to its resting position to the side of the body.