The clavicular head of the pectoralis major takes its origin from the anterior surface of the medial half of the clavicle. The sternocostal head takes its origin from the anterior surface of the sternum, the superior six costal cartilages, and the aponeurosis of the external oblique muscle. In anatomy, the clavicle or collar bone is a bone located in the chest wall anterior and superior to the lungs. ... Aponeurosis is the singular of Aponeuroses Grays Anatomy states that Aponeuroses are flattened or ribbon-shaped tendons, of a pearly white color, iridescent, glistening, and similar in structure to the tendons. ...
The muscle fibres then converge and inserted into the lateral lip of the intertubucular groove of the humerus The humerus is an long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ...
Action
Clavicular head : flexes the humerus Sternocostal head : extends the humerus
As a whole, the pectoralis major adducts and laterally rotate the humerus. It also draws the scapula anteriorly and inferiorly. In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ...
Innervation
lateral and medial pectoral nerves
the clavicular head is innervated by nerves from C5 and C6
the sternocostal head is innervated by nerves from C7, C8 and T1
On migration and in winter, the Pectoral Sandpiper is typically found in fresh water habitats.
While Pectoral Sandpiper has not been recorded as breeding species in Europe, it has been found in Scotland in suitable breeding habitat in summer (Alan Vittery, 1997, The Birds of Sutherland).
Lees, A.C. and Gilroy, J.G. Pectoral Sandpipers in Europe: vagrancy patterns and the influx of 2003.
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