Bone Structure

Bone Tissue Characteristics Bone is also called osseous tissue Are a supporting connective tissue

2 Types of Bone Tissue Compact (dense) Spongy (cancellous)

Compact Bone Has a repeating functional unit called the osteon, or Haversian system Osteon is made of concentric circles of lamella Surrounding a central canal that has blood vessels in it Perforating canals allow for blood vessels in the central canals to be linked to other vessels Covers all bone surfaces except articulating surfaces Found in highly stressed areas, diaphysis of long bones

Compact Bone Osteon Central canal Perforating canal Osteocyte Lacuna Bone matrix

Spongy Bone Has no osteons The lamellae form rods called trabeculae Found in the epiphyses of long bones and inside short, flat & irregular bones Much lighter than compact bone Reducing the work of muscles to move bones

http://youtu.be/c5zcGv8MvMc Spongy bone Cellular layer of periosteum Marrow cavity Fibrous layer of periosteum Compact bone Small vein Capillary Lamellae Canaliculi Lamellae Osteons Endosteum Central canal Vein Artery Osteon Lacunae Osteon LM x 343 In this thin section through compact bone, the intact matrix making up the lamellae appears white, and the central canal, luacunae, and canaliculi appear black due to the presence of bone dust. Central canal Perforating canal Trabeculae of spongy bone This diagrammatic view depicts the parallel osteons of compact bone and the trabecular network of spongy bone. © 2013 Pearson Education, Inc.

Compact and Spongy Bone