Anatomy and Cell Biology 3319 Lecture Notes - Lecture 1: Brachial Plexus, Radial Sulcus, Deltoid Tuberosity
23 Jun 2016
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Upper limbs are lighter, lower limbs are heavier. Upper limbs are obviously still powerful, but are more capable of doing complex fine movement than lower limbs. Extension = straightening, increasing angle between body parts. Medial rotation (internal rotation) = turning body part towards midline; lateral rotation (external rotation) = turning body part away from midline adduction, flexion, and extension. Circumduction = only limbs can do this, like drawing a circle; combo of 4 movements: abduction, Retraction: drawing shoulder blades together (bottom position of push-up) Protraction: scapulas rotate forward and glide around ribcage (up position of pushup) When we move our arms, our scapula moves with it; scapula helps get our arm all the way up, Supination: rotation of forearm so palms face anteriorly. Pronation: rotation of forearm so palms face posteriorly, such that the ulna and radius cross instead of just midway over e/o. In anatomical terminology, the arm is only the top part of the upper limb.
