There are two types of bone tissue: (1) spongy (cancellous) bone is made of tiny bone struts called _________________________________ which contain osteocytes and irregularly arranged bone matrix, and ___________________________ for production of blood cells can be found in cavities of spongy bone, (2) compact bones consist of many structural units called ________________ which is made of concentric layers of bone matrix called _______________, and unlike cartilage, bone has a rich supply of _______________ which facilitates bone repair. 2. Bones are enclosed by a membrane called _____________________, the inner layer of which contains _________________ for building bones (bone secretion) and _________________ for destroying bones (bone resorption). Medullary cavity is lined with a layer of membrane called _________________________ which also contains bone-forming and bone-destroying cells. Osteogenic cells in these membranes give rise to ________________ cells which turn into ______________________ cells once they are trapped in lacunae. 3. Ossification (osteogenesis) is the process of ___________________________. During embryogenesis, the bony skeleton forms in two ways: (1) most flat bones (cranial bones) form through a process called _______________________________ossification which develops from a membrane made of fibrous connective tissue, (2) long bones form through a process called ____________________________ ossification which develops from models made of ______________________________________. 4. Ossification in children is in the form of bone growth. Long bones lengthen by interstitial growth (growth from within): chondrocytes in the proliferation zone of the _____________________________ divide and cause the bone to lengthen, and cartilage is replaced by bone tissue in the ______________ zone. Bones grow in thickness by appositional growth: bone matrix is added to the external bone surface because in periosteum ___________________ activity is greater than __________________ activity, and bone matrix is removed from the internal surface because in endosteum _____________ activity is greater than ________________________ activity, making the medullary cavity grow wider
1. There are two types of bone tissue: (1) spongy (cancellous) bone is made of tiny bone struts called _________________________________ which contain osteocytes and irregularly arranged bone matrix, and ___________________________ for production of blood cells can be found in cavities of spongy bone, (2) compact bones consist of many structural units called ________________ which is made of concentric layers of bone matrix called _______________, and unlike cartilage, bone has a rich supply of _______________ which facilitates bone repair.
2. Bones are enclosed by a membrane called _____________________, the inner layer of which contains _________________ for building bones (bone secretion) and _________________ for destroying bones (bone resorption). Medullary cavity is lined with a layer of membrane called _________________________ which also contains bone-forming and bone-destroying cells. Osteogenic cells in these membranes give rise to ________________ cells which turn into ______________________ cells once they are trapped in lacunae.
3. Ossification (osteogenesis) is the process of ___________________________. During embryogenesis, the bony skeleton forms in two ways: (1) most flat bones (cranial bones) form through a process called _______________________________ossification which develops from a membrane made of fibrous connective tissue, (2) long bones form through a process called ____________________________ ossification which develops from models made of ______________________________________.
4. Ossification in children is in the form of bone growth. Long bones lengthen by interstitial growth (growth from within): chondrocytes in the proliferation zone of the _____________________________ divide and cause the bone to lengthen, and cartilage is replaced by bone tissue in the ______________ zone. Bones grow in thickness by appositional growth: bone matrix is added to the external bone surface because in periosteum ___________________ activity is greater than __________________ activity, and bone matrix is removed from the internal surface because in endosteum _____________ activity is greater than ________________________ activity, making the medullary cavity grow wider?
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