Flat Bones

• thin, parallel surfaces
• provide protection for underlying soft tissues
• ex. parietal bone

Sutural Bones

• wormain bones
• small, flat, irregularly shaped bones between the flat bones of skull
• ex. jigsaw borders/sutures

Long Bones

• long and slender
• located in the arm, forearm, thigh and leg, palms, soles, fingers, and toes
• ex. humerus

Irregular Bones

• complex shape with short, flat, ridged surfaces
• ex. vertebre

Sesamoid Bones

• small, flat, and shaped like a sesame seed
• located near jionts at the knees, hands, and feet
• ex. patella

• small and boxy
• ex. carpal bones (wrist) and tarsal bones (ankle)

Osteocytes

• produce new bone matrix
• make and release the proteins and organic compounds of the matrix

• stem cells divide to produce daughter cells that change into osteoblasts
• important in the repair of a fracture or break in the bone

• cells that remove and recycle bone matrix
• contain 50 or more nuclei

Osteon

Spongy Bone

• trabecular bone
• consist of open network of struts and plates
• located where bones are not heavily stressed
• lighter than compact bone

Circumferential lamellae

• found at the outer and inner surfaces of the bone
• covered by periosteum and endosteum

Interstitial lamellae

• fill in the spaces between the osteons in compact bone

• crystals of calium phosphate interacted with calcium hydroxide
• very hard and brittle