200 ANATOMY IN A NUTSHELL. 



inner surface of the shaft of the fibula extending one and one-half inches. (Plates 

 LXXXIII-LXXXVL) 



The fourth ligamenl of this set is the Ions external lateral ligament, which 

 is the divorced tendon of the Peroneus longus and is nowa rounded cord, being 

 attached above to the external condyle of the femur and below to the external 

 pari of the head of the fibula. It divides the tendon of the Biceps into two 

 portions. (Plates LXXXIV-LXXXVI.) 



The fifth ligament of this set is the short external lateral ligament, which 

 lies behind and almost parallel with the long external lateral ligament and it 

 is very indistinct, being attached above to the outer condyle of the femur and 

 below to the styloid process of the fibula. 



The sixth ligament of this set is a capsular ligament. It fills the spaces 

 left by the>e other ligaments. It is thin and is attached to the margins of the 

 articular surfaces of the bones. It blends with the fascia of the thigh and re- 

 ceives expansions from the Vast! muscles above, called lateral patellar liga- 

 ments. (Plate LXXXIII.) 



'The following structures are on the head of the tibia from before backward 

 in the median line. (Plate LXXXY.) 



1. Transverse ligament. 



2. Anterior extremity of internal semilunar cartilage. 



3. Anterior crucial ligament. 



4. Anterior extremity of external semilunar cartilage. 



5. The spine of tibia. 



6. Posterior extremity of external semilunar cartilage. 



7. Posterior extremity of internal semilunar cartilage. 



8. Posterior crucial ligament. 



The ligaments of the internal set are eight in number. 



The first ligament is the anterior or external crucial, which is attached to 

 the depression in front of the spine of the tibia and to the external semilunar 

 fibro-cartilage. It now passes upward, backward, and outward to the pos- 

 terior pint of the inner side of the external condyle of the femur. (Plate 

 LXXXV.) 



The second ligament of this set is the posterior or internal crucial, which is 

 attached to a depression behind the spine of the tibia, to the popliteal notch, 

 and also to the posterior border of the external semilunar fibro-cartilage. From 

 here it passes upward, forward, and inward to be attached to the oblique curve 

 of the inui )■ condyle, to the fore part of the intercondylar fossa, also to the an- 

 terior part of the outer surface of the inner condyle. 



The semilunar fibro-cartilages help to deepen the cavities which receive 

 the condyle of the femur. They are thicker at the circumference than at the 

 central portion. The internal semilunar fibro-cartilage is longer antero-pos- 

 teriorly than transversely. lis anterior extremity is attached in front of the 

 anterior crucial ligamenl to the tibia and the posterior extremity is attached 

 in front of the posterior crucial ligament. The external semilunar fibro-cartil- 

 age is nearly circular, and its anterior extremity is attached in front of the spine 

 to the tibia, its posterior extremity is attached to the back of the spine. (Plate 

 LXXXV.) 



