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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
The upper and lower fibers of pectoralis major insert to the crest of greater tubercle of the humerus. Upper fibers are more anterior and caudal on the crest, while posterior fibers twist on themselves and are more posterior and cranial than the upper fibers.
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.
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.
26 Δεκ 2017 · The pec major is the largest and most superficial of the anterior axioappendicular muscles, lying superficial to the entire pectoralis minor and subclavius, and part of the serratus anterior. The muscle consists of two heads: the clavicular head, or upper chest fibers; and the sternocostal (sternal) head, or lower chest fibers, which makes up ...
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.
28 Αυγ 2023 · All the fibers converge and end in a flat tendon, inserting into the lateral lip of the bicipital groove of the humerus. The actions of the pectoralis major are dependent on which parts of the muscle are activated. The fibers attaching to the clavicular head allow for the flexion of the humerus, seen as in lifting a glass for a toast.
