2- The Skeletal Tissues:
These tissues compose the skeleton. They are either cartilage or bone.
I-Cartilage
Is a specialized form of connective tissue in which the extracellular matrix has a firm consistency, it is essential for the development and the growth of long bones, It consist of cells (Chondrocytes) and an extensive extracellular matrix composed of fibers and ground substance. The cells are located in cavities called lacuna, also it surrounded by the perichondrium which is a capsule like sheath of dense connective tissue. Three forms of cartilage have evolved,each exhibiting variations matrix composition.
(a)- Hyaline Cartilage. Examine a T. S. of the trachea of the rabbit. Note that the matrix is solid and clear, and that the chondroblasts or chondrocytes are arranged either singly or in-groups of twos, fours or rarely eighths. Note that the single or group of chondroblasts lies in a clear capsule or lacuna and the presence the perichondrium.
(b)- Fibrous cartilage. Has matrix rich in white fibers and there is no perichondrium, it is found in the ientervertebral discs in mammals.
Ccartilage Ffibroblast
(c
Elastic cartilage .Has a matrix rich in yellow fibers and surrounded by perichondrium it is found in the ear pinna and cepiglottis of mammals.
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 .