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The pectoralis major (from Latin pectus 'breast') is a thick, fan-shaped or triangular convergent muscle of the human chest. It makes up the bulk of the chest muscles and lies under the breast . Beneath the pectoralis major is the pectoralis minor muscle .
subscapularis, pectoralis major, latissimus dorsi: 2 1 teres minor: Upper limb, Shoulder, rotator cuff, Right/left lateral border of scapula: inferior facet of greater tubercle of humerus: posterior circumflex humeral artery, circumflex scapular artery: axillary nerve: laterally rotates and adducts humerus: subscapularis, pectoralis major ...
Pectoralis minor is a thin, triangular muscle located beneath the pectoralis major. It attaches to the ribs, and serves to stabilize the scapula, the large bone of the shoulder. The pectoral fascia is a thin layer of tissue over the pectoralis major, extending toward the latissimus dorsi muscle on the back.
[3] [6] Convergent muscles, such as the pectoralis major in humans, have a weaker pull on the attachment site compared to other parallel fibers due to their broad nature. These muscles are considered versatile because of their ability to change the direction of pull depending on how the fibers are contracting.
Apart from the above neck muscles, the following muscles have also been observed contributing to respiration: serratus anterior, pectoralis major and pectoralis minor, trapezius, latissimus dorsi, erector spinae, iliocostalis, quadratus lumborum, serratus posterior superior, serratus posterior inferior, levatores costarum, transversus thoracis ...
Of the two borders the superior is concave, the inferior convex; they afford attachment to the internal intercostals: the upper border of the sixth gives attachment also to the pectoralis major. The inferior borders of the sixth, seventh, eighth, and ninth cartilages present heel-like projections at the points of greatest convexity. These ...
Accessory muscles of the anterior thoracic wall include the sternalis muscle, the axillary arch (Langer's), variations of pectoralis major such as the pectoralis minimus, pectoralis quartus, and pectoralis intermedius, the chondrocoracoideus and chondrofascialis. [3] The whole pectoral region is subject to a high degree of variability.
Pectoralis major muscle, commonly referred to as "pectorals" or "pecs" Pectoralis minor muscle; Pectoral fins of an aquatic animal, such as a whale or fish, located on both sides of the body; Pectoral sandpiper, a bird