The Muscular System

The Muscular System - o Muscles of the abdominal wall flex...

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The Muscular System Skeletal Muscle Anatomy General Principles o Most muscles have an origin on one bone and an insertion onto another and cross at least one joint. o Muscles working together are synergists; muscles working in opposition are antagonists. o A prime mover is the one muscle of a synergistic group that is primarily responsible for the movement. Nomenclature o Muscles are named according to location, origin and insertion, number of heads, or function. Muscles of the Head and Neck o Muscles of facial expression are associated primarily with the mouth and eyes. o Four pairs of muscles are involved in mastication. o Tongue movements involve intrinsic and extrinsic muscles. o Swallowing involves suprahyoid and infrahyoid muscles, plus muscles of the soft palate, pharynx, and larynx. o Neck muscles move the head. Trunk Muscles o Erector spinae muscles hold the body erect. o Intercostal muscles and the diaphragm are involved in breathing.
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Unformatted text preview: o Muscles of the abdominal wall flex and rotate the vertebral column, compress the abdominal cavity, and hold in and protect the abdominal organs. o Muscles form the floor of the pelvis. Upper Limb Muscles • The upper limb is attached to the body primarily by muscles. • Arm movements are accomplished by pectoral, rotator cuff, and deltoid muscles. • The forearm is flexed and extended by anterior and posterior arm muscles, respectively. • Supination and pronation of the forearm are accomplished by supinators and pronators in the forearm. • Movements of the wrist and fingers are accomplished by most of the 20 forearm muscles and 19 intrinsic muscles in the hand. Lower Limb Muscles • Hip muscles flex, extend, and abduct the thigh. • Thigh muscles flex, extend, and adduct the thigh. They also flex and extend the leg. • Muscles of the leg and foot are similar to those of the forearm and hand...
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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