Diagram for Microscopic Structure
Diagram Of Bone Structure
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Types of Bones
a. Long bones: elongated shape, not necessarily in size -shaft with heads at both ends -primarily compact bone -contains spongy bone in its interior b. Short bones: cube-like -thin outer surface is compact bone -composed mostly of spongy bone -bones of wrist and ankle -sesamoid bones such as the patella: attach to tendons c. Flat bones: thin, flat, and usually curved -thin layers of compact bone around a layer of spongy bone -sternum, ribs, and skull bones d. Irregular bones: bones that don't fit into categories -examples: vertebra and hip bones -mostly spongy bone with thin outer layers of compact bone
Major Subdivisions
There are two main divisions in the skeleton, axial and appendicular. Axial: The axial skeleton consists of bones that form the skull, laryngeal skeleton, vertebral column, and thoracic cage. -The Skull -Paranasal Sinuses -Hyoid Bone -Fetal Skull -Vertebral Column -Bony Thorax: sternum, ribs, thoracic vertebrae Appendicular: The appendicular skeleton consists of the bones that form the upper and lower limbs, shoulder, and pelvic girdle. -Upper limbs: Humerus, Ulna, Radius -Hand: Carpals, Metacarpals, Phalanges -Lower Limb: Femur, Tibia, Fibula -Foot: Tarsals, Metatarsals, phalanges Pectoral Girdle: Clavicle, Scapula
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