ANT 350 Lecture Notes - Lecture 6: Greater Sciatic Notch, Ischial Spine, Iliac Crest
Document Summary
Flexion: pulls bone toward cranium or midpoint of body (bends) Origin: attachment of muscle that usually moves the least when the muscles fires. Insertion: attachment of muscle that usually moves the most when the muscle fires. Reaction force: force applied against an immovable object results in return (or) reaction force. Hominin: spine poorly developed, short, broad iliac blade post-acetabular, pillar weak extension, greater sciatic notch, groove absent. Lateral iliac flare: smaller, anterior inferior iliac spine well, relatively long developed. Iliac pillar well developed: spine poorly developed. Iliopsoas groove present: acetabulum sacroiliac articulation distance = short, sacroiliac articular surface = large, ischial level arm (acetabulum-ischial tuberosity) = short, ischial spine well developed. Long and narrow iliac blade no extension: no notch, straight iliac crest, posterior facing iliac blade, no flare. Bicondylar angle: apes: 1-2 degrees, humans: 7-11 degrees. Neck shaft angle: apes: ~90 degrees, humans: ~135 degrees. Gluteal line: apes: stays lateral, apes: absent, humans: present, humans: lateral to posterior.
