Activity 73 Two types of bone tissue exist in the skeleton: compact and spongy C

Question

Activity 73 Two types of bone tissue exist in the skeleton: compact and spongy Compact bone is an extremely dense material that forms the hard Examining the Microscopic Structure of Bone exterior covering of all bones. Spongy (cancellous) bone fills the interior regions of most a thin internal laver along the diaphyses of long bones A Compact Bone Examine a three-dimensional model showing a microscopic section of bone tissue. Identify the structures illustrated in the following figures CapiPary and venule Endosteum 0 Identify the basic functional unit of compact bone, a microscopic structure caled an osteon Haversian system). Osteons are circular columns of bone tissue that run parallel to one another and the bone's longitudinal axis. i Locate the central (Haversian) canal, which travels through the center of the osteon Observe that each osteon is composed of several bone layers (bone lamellae; singular lamella). The lamellae form concentric rings of bone tissue around the central canal lameliae Circumferential lamellae Central canal Periosteum Vein Artery Central- canal Osteon Compact bone Compact bone Notice that the central canals are connected by cross channels known as perforating canals. Small arteries, veins, nerves, and lhymphatic vessels travel through the central and perforating canals Identify several small cavities called lacunae (singular lacuna), which are positioned between the bone lamellae. Osteocytes (bone cells) are located in the lacunae and give rise to cell processes that Central and perforating canals form a network of passageways within compact bone. Why are these canals important for the normal functioning of bone tissue? narrow passageways called canalicul. The processes of nearby cells form cell junctions with one another 86 EXEROSE 7 introduction to the Skeletal System and the Axial Skeleton

Explanation / Answer

ANSWER ) There are some major functions of canals (Haversian canal and Volkman's canal) that present in the connective tissue of compact bone. first, it assist to grow 'Osteoproginitor cells' in the bone passage way that can give rise to osteoblasts (bone forming cells) and osteoclasts cell (bone destroying cells). Second, both these central Haversian and lateral Volkman's canals carry blood vessels, lymph vessels, connective tissue and nerves to maintain normal function by providing essential needs.

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