PRACTICAL ANATOMY. 



fibre. Acetic acid does not affect it. It is found in all 

 elastic ligaments, such as the ligamentum nuchse, those 

 of the larynx, ligamenta subflava, and the elastic coat of 

 arteries. 



Articulations, or joints, are divided into freely mova- 

 ble, partly movable, and immovable. The freely movable 

 are called the diarthrodial, and are divided into four 

 classes : 



1. Arthrodial. These are gliding joints, such as the 

 thyro-cricoid and acromio-clavicular articulations. 



2. Enarthrodial. Ball-and-socket joints, such as the 

 shoulder and hip. 



3. Ginglymus, or hinge-joint, as the knee and inter- 

 phalangeal. 



4. Diarthrosis rotatoria, or lateral hinge-joints, as the 

 superior radio-ulnar. 



The partly-movable joints are called the amphiar- 

 throdial ; they are such as the intervertebral. 



The immovable articulations are divided into three 



classes : 



(a) Dentata ; by tooth- 

 like processes. 



(6) Serrata; by saw- 

 tooth-like proc- 

 esses. 



(c) Limbosa ; by bev- 

 eled margins and 

 tooth-like proc- 

 esses. 





1. Sutura. 



(A) Sutura vera (true 

 sutures) ; articu- 

 late by interlock- 

 ing processes. 



(B) Sutura notha 

 (false sutures) ; ar- 

 ticulate by apposi- 

 tion. 



(a) Squamosa ; by 

 beveled margins. 



(b) Harmonia ; by 

 abutting surfaces. 



2. Schindylesis, or groove-and-tongue articulation, as 

 the ethmoidal spine with the ethmoid, and the articula- 

 tion of the vomer with the rostrum of the sphenoid. 



3. Gomphosis, or socket-like joint, as the teeth. 



