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3 Νοε 2023 · The muscle fibers from all three parts run laterally, converging towards the proximal humerus. They give off a broad tendon that inserts along the crest of the greater tubercle of humerus.
- Types of Movements in The Human Body
Flexion and extension of the shoulder occur like this:....
- Types of Movements in The Human Body
24 Ιουλ 2023 · The pectoralis major shows variation in muscle fiber length, differing from the majority of muscle fibers in the human body, which usually show uniform length. This configuration of the muscle fibers potentially allows for more power production through differing muscle shortening velocities.
Sensory information for the pectoralis major is processed in the superior portion of the sensory homunculus, adjacent to the longitudinal fissure which divides the two hemispheres of the brain. Electromyography suggests that it consists of at least six groups of muscle fibres that can be independently coordinated by the central nervous system.
5 Μαΐ 2023 · The pectoralis major is a large, triangular, or fan-shaped superficial muscle lying at the anteriormost position in the chest cavity. It forms the front wall of the axilla, making up most of the chest and breast.
10 Φεβ 2018 · The pectoralis major is composed mainly of two parts- the clavicular head and the sternocostal head. • The clavicular head originates from the anterior portion of the medial half of the clavicle. • The sternocostal head originates from the anterior portion of the sternum, the six upper costal cartilages (1-6) and the external oblique aponeurosis.
15 Σεπ 2023 · Pectoralis major is innervated by the lateral and medial pectoral nerves, two branches of the brachial plexus. The pectoralis major is involved in a variety of arm movements, such as adduction, internal rotation, flexion and extension.
7 Σεπ 2023 · The pectoralis major is a fan-shaped muscle in the front of your chest wall. 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.
