Understand the origin, insertion, and action of the following muscles: Lateral rectus, Diaphragm, and Pectoralis major.

Expert Solution

Muscle	Origin	Insertion	Action
Lateral Rectus	Common tendinous ring -(Annulus of Zinn)-It is a ring of fibrous tissue which surrounds optic nerve at the apex of the orbit	Anterior half of the eyeball,posterior to the corneoscleral junction	Helps in the abduction of Eyeball
Diaphragm	1.Sternum at the xyphoid process 2.Lower six ribs and the spaces in between them 3.Lower part of the spine. [ Diaphragm is attached to spine by processes called crura which protrude laterally from the vertebrae.Spinal attachment is in upper 2-3 lumbar Vertebra]	Central Tendon. [it is the aponeurosis that forms the top of the dome-shaped diaphragm]	Helps Normal Breathing [ During Inspiration-Diaphragm contracts and flattens which creates vacuum effect so that air is pulled in .During Expiration diaphragm relaxes-air is pushed out of lungs]
Pectoralis Major	a)-Clavicular Head:Anterior surface of medial Half of Clavicle b)Sternocoastal:Anterior Surface of sternum,Upper 6 Coastal cartilage	Lateral lip of intertubercular groove of Humerus	Adduct and medially rotate humerus Draws scapula Anteriorly

Sydney Mullin answered 1 year ago

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