Anatomy and Cell Biology 3319 Study Guide - Midterm Guide: Brachialis Muscle, Radial Tuberosity, Iliac Crest

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Steve Laviolette

Document Summary

Osteology of the pectoral girdle and upper limb/ Review of the pectoral girdle and arm bones. Muscles that cross the shoulder joint and move the arm. Origin: sternal end of clavicle, sternum and cartilage of ribs 1-6: clavicular head: ant. Surface of medial of clavicle: sternocostal head: ant. Surface of sternum, superior 6 costal cartilages and aponeurosis of external oblique. Insertion: lateral lip of intertuberclar groove of humerus (greater tubercle of humerus in textbook) Function: flexion, medial rotation and adduction of arm against resistance. Origin: lateral third of clavicle, acromium, scapular spine and trapezius. Antagonist of pectoralis major and latissimus dorsi muscles, when all fibers contract: ant. Fibers: flexes and medially rotates arm: mid. Origin: vertebrae t6-l5, lower 4 ribs, iliac crest, and thoracolumbar fascia. Origin: posterior surface of scapula at inferior angle. Insertion: intertuberclar groove - lesser tubercle of anterior humerus (tendon fusion with lat. Function: extension, adduction and medial rotation at the shoulder of the arm.