Question

draw the diagram of canaliculi and areolar tissue with functions

Answer 1

A) Areolar Tissue (= Loose connective tissue):

This tissue is most widely distributed connective tissue in the animal body.

Functions:

To bind parts together is the primary function of areolar tissue. Other functions are to provide strength, elasticity, support to the parts where this tissue is present. It also provides rapid diffusion of materials and migration of wandering cells towards areas of infection and repair.

(B) Matrix:

It is composed of a protein called ossein. The main salts found in the ma­trix are calcium phosphate, calcium carbonate, sodium chloride and magnesium phosphate. Of these calcium phosphate is maximum in the vertebrate bone.

The Haversian canals, a char­acteristic feature of the mammalian bones, are present in the matrix. Each Haversian canal contains an artery, a vein, a lymph vessel, a nerve and some bone cells, all packed in with connective tissue. The Haversian canals are interconnected by transverse channels, the Volkmann’s canals.

The matrix has numerous inactive bone cells, the osteocytes. The latter contain reduced numbers of cell organelles and often store glycogen. An osteocyte is surrounded by a fluid-filled space, the bone lacuna, which leads into fine radiating channels, the canaliculi (minute canals).

In the developing bone, the osteocytes give off several projections called protoplasmic processes (= filopodia) which extend through the canaliculi. With the help of canaliculi and protoplasmic processes one osteocyte is in contact with another osteocyte. The matrix of the bone occurs as layers called lamellae.

Answer 2

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