Compact and Spongy Bone Diagram | Quizlet

Compact Bone

aka cortical, dense
more solid, resists bending. external layer of all bone. bulk of shaft

Spongy Bone

aka trabecular, cancellous
important for compression, especially at joints. reduces weight of bone. serves as protection of bone marrow. found in short bones, flat bones, irregular bones, and end of long bones

Osteons

Cylindrical structures that comprise compact bone, organized along lines of stress, constantly changing

Concentric Lamellae

Ring of calcified ECM dotted within osteocytes. passageway for neurovascular and lymph

Lacunae

lakes for osteocytes within osteon

Canaliculi

Hairlike canals that connect lacunae to each other and the central canal for osteocyte processes

Interstitial Lamellae

fragments of older osteons found between osteons

Perforating (Volkmann's) canals

penetrate compact bone to allow for neurovasculature to enter bone

Circumferential Lamellae

super wide outer and inner circumference. important for appositional growth (bone growth width wise)

Epiphysis

ends of long bones, joint formation

Diaphysis

shaft of long bone

Metephysis

in growing person, cartilage grow to eventually become bone. growth plate

Periosteum

connective tissue surrounding all bone except where articular cartilage. 2 layers: outer fibrous and inner osteogenic

Sharpey's (perforating) fibers

connective tissue fibers that secure the periosteum to the underlying bone

Articular Cartilage

covers the surfaces of bones where they come together to form joints

Medullary Cavity

central, hollowed-out area in the shaft of a long bone for marrow and neurovasculature

Endosteum

membrane lining the medullary cavity of a bone