BIOSC-139 Lecture Notes - Lecture 30: Rectus Abdominis Muscle, Inguinal Hernia, Shoulder Girdle
22 Oct 2020
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Anterior abdominal wall muscles linea alba = landmark. Rectus sheath covering, flat sheet tendon = aponeurosis. Each mmuscle layer, the fascicle arrangement different directions. Contain viscera, compress cavity, flex, rotate column transversus abdominus muscle is third and deepest. Created corset of such fibers protecting in all different directions. Obesity, sedentary, (keep abdominal muscles in tone), gym lifting weight and breathing through exercise, straining inguinal hernia. Function of group: stabilize and position the pectoral girdle. Attaching or originating at clavicle and scapula (stabilizing or positioning) Origins/insert can get switched on this one. Postural & active movement, used to lat flex, and rotate head,neck, assist shrug, stabilize the shoulders. Elevates, depresses, rotates, and retracts the scapula. Origin: extern occip protuber, spinous process c7-t12. Insert: nuchal lig, clavical, acromion/spine of scapula. Look at how rhomboid attach to scapular border (medial) Contract rotate scapula and allow to retract. Retract scap (movong medial), ro depress glenoid fossa, fixes scapula to thoracic wall.
