48 



ELEMENTS OF BIOLOGY 



Squamous 



Epithelial 



Tissues { Columnar 

 (Surfaces} 



Pavement type. One layer of cells. Example, lining of 



lungs. 



j Stratified type. Several layers of overlapping cells. 

 [Example, lining of mouth. 



Simple type. Single layer of cuboidal cells. Example, 

 lining of intestine. 



Ciliated type. Columnar cells with free surface 

 equipped with cilia. Example, lining of trachea. 



1 Single layer of irregularly shaped thin cells. On sur- 

 faces that do not communicate with the atmosphere. 

 Example, lining of blood vessels. 



Connective 

 Tissues 

 (Connection < 

 and 

 support) 



Muscular 

 Tissues 



Reticular 



Fibrous 



Adipose 



Cartilage 



Bone 



Plain 



Card 



lac 



Striated 



Nervous Tissue 



fplat, star-shaped cells forming a network or support- 

 ling framework. In lymph nodes. 



[The most common form. Occasional cells with an 

 I intercellular mass of fibres, some white and some 

 [elastic. Example, ligaments. There are several varie- 

 ties of fibrous tissue. 



fConnective tissue modified to include fat. General in 

 \distribution. 



[The intercellular fibres are so firmly condensed as to 

 { appear to be homogeneous. Example, cartilages in 

 [wall of trachea. 



fThe intercellular substance is impregnated with lime 

 [salts and is very rigid. 



[Bundles and thin sheets of elongated cells that are 

 {contractile but not under control of the will. Ex- 

 [ample, muscles in wall of stomach. 



fpound onlv in the wall of the heart. Irregularly 

 [shaped cells forming a reticulum or network. 



[Long, cylindrical, multinuclear cells bound in bundles 

 { by connective tissue. Usually voluntary and usually 

 [attached to bone. 



Consists essentially of (tf) nerve cells, known as 

 neurons; (^) long fibrous outgrowths of neurons, 

 known according to function as axones and dendrites; 

 (c) a special type of binding and sustaining tissue 

 known as neuroglia. 



