Skeletal System Lesson 1Bones Definition Bone Bone is

Skeletal System(������ ) Lesson 1(Bones)

Definition: -Bone(��� ) �Bone is a specialized connective tissue composed of calcified extracellular matrix with three bones cells: Osteoblasts, osteocytes and osteoclasts. (���� ��� ������� ��� ���� �� )

Classify Bone. �Bones can be Classified in different ways: ����������� ��� ������ �Histologically: -*Woven bones ������ � *Lameller bone ������������ �By Texures. *Compact *Spongy bone �Morphologically: - *Long bone(Femur, Tibia, Fibula) � *Short bones(Carpal, tarsal) � *Flat bones(Sternum, Ribs, Scapula) � *Irregular bones(Vertebrae, Hipbone) � *Pneumatic bones(Maxilla, Sphenoid, Ethmoid) � *Sesamoid bones(Patella)

Function of Bones �Bones from the framework of the body. (������ ��� ������ ) �Bones tissue supports fleshy structure. (��� ������� ��� ) �Bones protect the internal organs(����� ����� ) �They provide attachment sites for muscles and organs. (������� ������� �They resist all forms of mechanical stresses.

Name the bones of superior extremity �Scapula �Clavicle �Humerus �Radius �Ulna �Carpal bone �Metacarpal bone �Phalanges

Bones of inferior extremity �Hip bone �Femur �Tibia �Fibula �Patella �Tarsal �Metatarsal �Phalanges

Name the different types of Vertebrae � 1. Cervical vertebrae 7 � 2. Thoracic vertebrae 12 � 3. Lumber Vertebrae 5 � 4. Sacrum vertebrae 5 � 5. Coccygeal vertebrae 4