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the bone3

الكلية كلية طب الاسنان     القسم  العلوم الاساسية     المرحلة 2
أستاذ المادة ندى مهدي عبد الرضا الخفاجي       16/01/2020 05:04:35
-According to histological structure
a- Spongy bone (cancellous bone)
The structure of this type look like sponge, the tissue arranged as trabeculae or spicules ,does not have osteons .Trabeculae have no blood vessels the space in spongy bone contain bone marrow which is highly vascular.


b- Compact bones(dense)
Solid structure, found in the shafts of long bones. The collagen fiber and other component of the bone are arranged as lamellae which exhibit typical forms
1.Haversian system (osteon): structural unit of concentric lamellae of osteocyte and matrix surrounding central canal containing blood and nerve vessels loose connective tissue, and endosteum. Between successive lamellae are lacunae, each with one osteocyte, interconnected by canaliculi containing the cell.
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2.Outer circumferential lamellae: located beneath the periosteum .
3.Inner circumferential lamellae : located around the marrow cavity.
4.Interstitial lamellae :irregularly shape lamellae lie between the two circumferential lamellae.
There are transverse channels connecting two Haversian canals called Volkmann canals.








Bone Marrow
The space between trabeculae is filled with marrow, which is highly vascular
-Red bone marrow : supplies nutrients to osteocytes in trabeculae , forms red and white blood cells
-Yellow bone marrow : yellow because it stores fat
Location of Hematopoietic Tissue (Red Marrow)
In infants :(Found in the medullary cavity and all areas of spongy bone )
In adults: (Found in the flat bones, and the head of the femur and humerus)


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .