BONE TISSUE BIOLOGY LAB ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018.

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Presentation transcript:

BONE TISSUE BIOLOGY LAB ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Types of bones ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Characteristics of Bone bone is a special form of connective tissue consists of cells, fibers, and extracellular matrix. Because of mineral deposition in the matrix, bones become calcified. produce hard structure for protecting various organs ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Bone Matrix Highly vascularized to aid diffusion in calcified matrix• Organic components of bone resist tension whereas mineral components resist compression Major component is coarse type I collagen fibers ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Bone cells Osteoprogenitor cells are located in the periosteum, endosteum,osteons, and perforating canals Osteoblasts are on the bone surfaces and synthesize osteoid matrix Osteocytes are mature osteoblasts, are branched, are located in lacunae, and use canaliculi for communication and exchange. maintain homeostasis of bone and blood concentrations of calcium and phosphate. ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Functions of bone can bear more weight than cartilage, serve as a rigid skeleton for the body provide attachment sites for muscles and organs. Bone also protects the brain in the skull, heart and lungs in the thorax, and urinary and reproductive organs between the pelvic bones. hemopoiesis (blood cell formation), reservoirs for calcium, phosphate, and other minerals. ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Compact (cortical, Lamellar) ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Cross section CC Osteons CC: Central Canal, Haversian canal 1/2/2018 ASSISTANT LECTURER FARAH E. ISMAEEL

longitudinal section ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Spongy (Cancellous, woven) bone ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Intramembranous ossification ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Endochondral ossification RPHCO Reserve cartilage Proliferation Hypertrophy Calcification Ossification ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

Proliferation zone Hypertrophy zone Calcification zone Ossification zone Zone of ossification ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018

THANK YOU ASSISTANT LECTURER FARAH E. ISMAEEL 1/2/2018