Learn to Draw Anatomy - Skeleton Structure

The human skeleton follows an eight-heads proportion system, with key structural elements including the skull with eye sockets, nasal cavity, and mandible; the rib cage with 12 pairs of ribs (including floating ribs) protecting internal organs; the vertebral column with alternating convex and concave curves; the shoulder girdle with clavicles and scapulae; the arm bones (humerus, radius, ulna) enabling rotational movement; and the hand and foot structures composed of carpal/tarsal bones, metacarpal/metatarsal bones, and phalanges. Male and female skeletons share the same basic structure but differ in proportions, with females having longer rib cages, narrower shoulders, and more inverted leg bones.