Explain the origin, insertion, and action of the following 10 muscles: Sternocleidomastoid, Occipitofrontalis, Zygomaticus major and minor,...

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Medical Sciences

Explain the origin, insertion, and action of the following 10muscles: Sternocleidomastoid, Occipitofrontalis, Zygomaticus majorand minor, Masseter, Lateral rectus, Diaphragm, Pectoralis major,Biceps brachii, Rectus femoris, and Gastrocnemius

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1 Sternocleidomastoid Muscle A Origin Sternocleidomastoid muscle is the large superficial muscle of the neck It consist of two parts a Sternal Head It arises from the superolateral part of the manubrium sterni b Clavicular Head Arises from the medial one third of the clavicle Lesser supraclavicular fossa is the triangular depression between these two heads The internal jugular vein overlies in this depression B Insertion It is inserted into the aLateral Surface of Mastoid process by a thick tendon bOccipital Bone by the thin aponeurosis into the lateral half of the superior nuchal line C Action The action depends on the contraction of the Sternocleidomastoid muscle of the corresponding side If See Answer

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