Bone tissues and microscopic structure Flashcards
Ossification
natural process of bone formation
intramembranous
within or between layer of membrane
Two components of connective tissue…
Organic and inorganic
Organic tissue is…
33% of matrix. Made up of collagen protein. Function is to resist tension.
Inorganic tissue is…
67% of matrix. Is hard. Made up of hydroxyapatite (mineral salts). Function is to resist compression.
Osteoblast
Matrix synthesizing cell responsible for bone growth. Builds ECM
ECM
Extracellular matrix
Osteocytes
mature bone cell that monitors and maintains mineralised bone matrix.
Osteoclasts
Breaks down ECM. Bone reabsorbing cell.
Matrix
intercellular substance of a bone
Compact bone is…
appears to have an impenetrable outer surface. Has foramina/ holes.
Osteon ( relating to compact bone)
shape- longitudinal (lengthwise) unit. Function- maintaining osteocytes by providing nutrients.
Lamella (e) (relating to compact bone)
shape-tubes of ECM with collagen fibres aligned to resist forces.
function- forms cylinders running lengthwise down shaft = forming the osteon
Central canal (relating to compact bone)
contains blood vessels and nerves
Lacunae (relating to compact bone)
cavity for osteocytes (lake)
Canaliculi (relating to compact bone)
channels for osteocytes through ECM
Periosteum (relating to compact bone)
fibrous sheath on outside of bone.
Subperiosteal (relating to compact bone)
surface of bone
Trabeculae (relating to cancellous bone)
struts of lamella bone, where marrow fills the cavities.
Lacuna
small space containing an osteocyte.
