Applied anatomy and kinesiology; the mechanism of muscular movement . Fig. 139 Fig. 140 Figs. 139 and 140.—Expansion of the abdomen by contraction of the 139 shows the position of the abdominal wall in quiet expiration. Fig. 140shows how it is protruded when the diaphragm contracts in taking a full breath. STERNOCLEroOMASTOID. A pair of muscles forming a letter V down the front and sides ofthe neck. Origin.—^The mastoid process of the skull. SCALENI 235 Insertion.—^The front of the sternum and the inner fourth of theposterior border of the clavicle. Structure.—Parallel fibers, d
Applied anatomy and kinesiology; the mechanism of muscular movement . Fig. 139 Fig. 140 Figs. 139 and 140.—Expansion of the abdomen by contraction of the 139 shows the position of the abdominal wall in quiet expiration. Fig. 140shows how it is protruded when the diaphragm contracts in taking a full breath. STERNOCLEroOMASTOID. A pair of muscles forming a letter V down the front and sides ofthe neck. Origin.—^The mastoid process of the skull. SCALENI 235 Insertion.—^The front of the sternum and the inner fourth of theposterior border of the clavicle. Structure.—Parallel fibers, dividing into two parts below its middle. Action.—As a breathing muscle, it lifts the sternum, both musclesof the pair acting together, while the head is held rigidly the lower end is the fixed point, which is more usual, one ofthe pair rotates the face to the opposite side and the two flex theneck. The sternocleidomastoid is an important muscle of respiration,acting in labored breathing in such exercises as running or in makinga deep inhalati
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