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11 Cards in this Set
- Front
- Back
External Intercostals
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11 pairs lie between ribs, form part of abdominal wall
O: inferior border of superior rib I: superior border of inferior rib A: pull ribs toward one another to elevate rib cage |
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Internal Intercostals
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11 pairs lie between ribs, at right angles to the fibres of the external instercostals.
O: superior border of inferior rib I: inferior border of superior rib A: draw ribs together and depress rib cage |
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Diaphragm
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Broad muscle that forms floor of thoracic cavity.
O: inferior, internal surface of rib cage and sternum, costal cartilages of last 6 ribs and lumbar vertebrae I: central tendon A; prime mover of inspiration |
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Rectus Abdominus
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Medial superficial muscle pair extending from the pubis to the rib cage. Segmented by 3 tendinous intersections.
O: pubic crest and symphysis I: xiphoid process and costal cartilages of ribs 5-7 A: flex and rotate lumbar region of vertebral column |
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External Oblique
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Largest and most superficial of the lateral anterior trunk muscles.
O: attached to outer surfaces of lower eight ribs by fleshy strips. I: insert to linea alba via broad aponeurosis, some into pubic crest and iliac crest A: aid rectus abdominis muscles (synergist) in flexing vertebral column and in compressing abdominal wall and increasing intra-abdominal pressure. |
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Internal Oblique
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Muscle fans along sides, above hips, deep to the external obliques.
O: lumbar fascia, iliac crest, and inguinal ligament I: linea alba, pubic crest, last three or four ribs, and costal margin A: Aids rectus abdominis and external oblique (synergist) in flexing vertebral column and in compressing the abdominal wall and increasing intra-abdominal pressure. |
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Transversus Abdominus
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Deepest muscle of the abdominal wall.
O: inguinal ligament, lumbar fascia, cartilages of last six ribs, iliac crest I: linea alba, pubic crest A: compresses abdominal contents. |
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Pectoralis Minor
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Flat, thin muscle directly beneath and obscured by pectoralis major
O: anterior surfaces of ribs 3-5 I: coracoid process of scapula A: draws scapula forward and downward |
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Serratus Anterior
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Lies deep to scapula, beneath and inferior to pectoral muscles on lateral rib cage.
O: attached by a series of muscle slips to ribs 1-8 I: entire anterior surface of vertebral border of scapula A: prime mover to protract and hold scapula against chest wall |
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Deltoid
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Thick, multipennate muscle forming rounded shoulder muscle mass
O: embraces insertion of the trapezius, lateral third of clavicle, acromion and spine of scapula I: deltoid tuberosity of humerus A: prime mover of arm abduction |
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Pectoralis Major
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Large, fan-shaped muscle covering the upper portion of the chest.
O: sternal end of clavicle, sternum, cartilage of ribs 1-6, and aponeurosis of external oblique muscle I: fibres converge to insert by a short tendon into intertubercular groove of humerus A: Prime mover of arm (upper arm) flexion |