39 



120. Muscles, like bones, have particular names, according to their 

 situation, form, attachment, and action, and they are well supplied 

 with blood-vessels, nerves, and absorbents. {See Plate VIII.) Their 

 action is under the influence of the nervous system. Muscle, in a 

 state of rest, is said to be neutral, or slightly alkaline, but becomes 

 acid when in action. 



121. The tissues of the body may be Cellular, White Fibrous, Yellow 

 Elastic, or Adipose. Cellular or Areolar Tissue consists of small 

 filaments interwoven together, forming a network. It is found in the 

 different organs of the body, giving support to their substance, also 

 binding them together and holding them m position. Cellular tissue 

 is loose connective tissue, having large interspaces. 



122. White Fibrous Tissue is made up of bundles of very fine 

 white fibres, and is the very tough unyielding substance found in the 

 tendons of muscles and most ligaments ; it is also present in the 

 periosteum, pericardium, &c. Fibrous tissue is the connective tissue 

 of the body, and composed of fibres. 



123. Yellow Elastic Tissue consists of yellow elastic branching 

 fibres, which are much larger than those of the white fibrous tissue, 

 but not so tough or strong, and, as the name indicates, more elastic. 

 It is of this connective tissue that the middle coat of the larger arteries 

 is formed, and it is very plentiful beneath the skin. It is also found in 

 certain ligaments. The Ugamentum nucha, for example, being entirely 

 composed of this tissue. 



124. Adipose, or Fatty Tissue consists of a number of cells 

 containing an oily substance, held together by a network of Areolar 

 tissue. It is found in nearly every part of the body — underneath the 

 skin, around joints, and enveloping the kidneys, &c. 



125. Tendons are, as before mentioned, found at the ends of 

 muscles, at their points of origin and termination. They are most 

 abundant in the lower parts of the extremities — shielding and protecting 

 joints ; at other times they are spread out like a fine, strong, thin 



