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Body Muscles

Anatomy

QuestionAnswer
Pectoralis major Fan shaped muscle of chest, anterior thorax, converges and inserts on humerus, arm adduction
External intercostals Between the ribs, action is to elevate the ribs for breathing, increase thoracic capacity
Internal intercostals Between the ribs, depress ribs for breathing, decrease thoracic capacity
Diaphragm Phrenic muscle, dome shaped muscle that divides thoracic cavity from abdominopelvic, origin ir in ribs, insertion is central tendon of diaphragm. Increase thoracic capacity
Three openings in diaphragm Vena Cava, aortic and esophagus
Trapezius Upper back muscle, elevates, rotates and retracts scapula
Lattimus dorsi lower back muscle that extends, adduct and rotates humerus
Rectus Abdominus Anteromeidal abdominal muscle that has horizontal tendonous intersection, flexes trunk
Linea alba Tendonous structure in the midline of rectus abdominus
External obliques Most superficial of anterolateral abdominal muscles, inserts in the linea alba, its action is to compress the abdomen
Internal obliques Is the intermediate depth of the anterolateral, inserts in the linea alba, compresses abdomen
Transverse Abdominus Deepest of anterolateral abdominal muscles inserts on the linea alba, compresses abdomen
Psoas Major Posterior abdominal wall muscle, flexes thigh
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