SYSTEMATIC SYNTHESIS OF TISSUES INTO ORGANS. 225 



round ligament and a surrounding capsular ligament. 

 (See Fig. 2, PI. 17.) 



371. THE THIGH-BONE (Femur) is CONSTRUCTED of 

 a hemispherical head, an adjoining neck, and a long shaft 

 that has two eminences above, called the greater and 

 smaller trochanters, and is furnished at the knee with 

 two enlargements, called internal and external condyles. 

 The head and condyles are covered with cartilages. 

 (See Figs. 3, 4, PI. 14.) 



372. THE FBMUB is CONNECTED by a hinge-joint 

 to the shin-bone (Tibia), enlarged very much at its up- 

 per extremity that it may assist in making a strong joint. 



373. THE BONES AT THE KNEE ARE BOUND TOGETHER 

 in the strongest manner by several ligaments ; so that, 

 though the knee is one of the most exposed parts of the 

 body, its bones are seldom dislocated. (See Figs. 3, 4, 

 5, 6, PI. 17.) 



374. THE KNEE is SUBJECT to so much forcible ac- 

 tion, that it is supplied with a friction cartilage and an 

 extra quantity of membrane to secrete synovial fluid. 

 (See Fig. 6, PI. 17.) 



375. THE KNEE-PAN (Patella, Rotulla), is not any 

 part of the knee-joint, but is connected with a tendon of 

 a muscle for the purpose of allowing advantageous action. 



376. BY THE SIDE OF THE TIBIA, in the lower leg, is 

 another slender bone (Fibula), that is united to the tibia 

 just below the knee, sometimes by a movable and some- 

 times by an immovable joint. 



377. THE TIBIA AND FIBULA ARE BOUND TOGETHER 

 throughout their extent by a broad ligament, that also 

 presents its surfaces for the attachment of muscles. 



378. THE ANKLE-JOINT is CHIEFLY CONSTRUCTED of 

 the tibia and ankle-bone of the foot (Astragalus), though 

 the fibula is also essential, and forms the outer ankle, con- 

 fining the ankle-bone in its place. (See Fig. 8, PI. 17). 



871. How ? 372. How ? 3T3. How ? 374. To what ? 375. What said 

 of - ? 376. What - ? 377. How - ? 378. How - ? 

 10* 



