Anatomy and Cell Biology 3319 Lecture 5: Upper Limbs
9 Mar 2017
School
Department
Professor
Document Summary
Upper and lower limbs have common primary 3 boned structure, but different function. Originally all four limbs were from quadrupeds and served as stabilizers for locomotion. Humans became bipedal in movement and began using upper extremity to manipulate tools. Upper limb osteology: pectoral girdle, humerus, radius, ulna, bones of hand. Is the only structure holding the arms to the axial skeleton. Has two parts: clavicle ; anterior, scapula ; posterior. This decrease in stability allows for increased flexibility in arm. The pectoral girdle is highly mobile but is thus also weak and prone to injury. It is not a true girdle since the scapulae done actually meet at the back so it is a semi girdle. Functions: provides attachment to axial skeleton and high flexibility for upper extremities. Medial attaching to the manubrium of sternum: acromial. Lateral attaches to the acromion process of the scapula.
