Cavum medulare
The compact substance forms the axtantal Iayer of the bone. while the spongy srdrstanc forms the internal layer. There is the cavity, called the merddular cavity
into the shaft of the long tubular bones. It contains the marrow (medulla osseumn)
MEDULLA OSSIUM RUBRA
(red manow) — present in
new-born and play blood - forming function
° MEDULLA OSSIUM FLAVA
(yellow marrow) — content of
bony cavity rn adret is rich
by fat cells.
Periosteum
-is thin a connective tissue plate
-consis t of 2 layers: external –fibrous and internal – osteogenic
-Sharpay’s fiber attach periosteum with bone
-By periosteum bone grows in thickness
DEVELOPMANT OF BONES
Bones develop in embryo at slx, seven weeks of the embryo- genesis. The origin of the development of 3 bones are sklerotoms (1) — medial portions of somites, or medial portions of the segmental part of the mesodermal layer.
Stages of development: 1-connective tissue (membranous) model 2- cartilaginous model, 3-bony stage
Kinds of ossification: Endesmal –in the connective tissue model
-Enchondral – in the cartilaginous model
-Perichondral – around cartilaginous model
-Periostal – around periostium
Chondral ossification of a long bone:
Endochondral ossification in the epiphysis
Perichondral ossification in the diaphysis
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