ARTHROLOGY 65 



The three phalanges are all provided with capsular ligaments, or 

 ligamenta capsularia, which bind together the several phalanges. 



The small or third finger is connected to the metacarpus by a 

 capsular ligament, the ligamentum capsulare, and by an interosseous 

 ligament, or ligamentum interosseum digitorum, to the first phalanx 

 of the second finger. 



Ligaments of the Pelvis. — The obturator foramen, formed by the 

 ilium and the ischium, is covered by a broad miembranous ligament 

 (Fig. 4, No. 29). 



The oblong foramen, or foramen oblongum, and the foramen 

 ischiadicum, formed by the ischium and the pubis are covered by 

 broad membranous ligaments (Fig. 4, Nos. 29 and 60). 



Poupart's ligament or ligamentum Poupartii, quite small in fowls, 

 extends from the anterior lower rim of the ilium to the pelvic cavity, 

 and is inserted at the bottom of the acetabulum. 



Another broad ligament originates from the posterior rim of the 

 ischium and is attached to the square surface of the first coccygeal 

 vertebra. 



The ilio-pubic ligament extends from the pubic spine to the last 

 rudimentary rib. 



Ligaments of the Hip-joint (Fig. 25, F). — The hip-joint is made up 

 of the Uium, ischium, pubis and femur and is a deep baU-and-socket 

 joint. The cavity or acetabuliun is called a cotyloid cavity. 



The hip-joint is provided with three ligaments. 



The ligamentum capsulare femoris is attached aroimd the rim of 

 the cotyloid cavity and aromid the rim of the articular head of the 

 femur (Fig. 25, No. F, 4). 



The ligamentum teres, or round ligament, is a very short ligament 

 Tvhich closes the hole at the floor of the cotyloid cavity, at which 

 point it is attached. It is also attached to the head of the 

 femur. 



The ligamentum ilio-sacrale strengthens the hip-joint capsule. 

 It passes from the lower anterior rim of the os ilii, extending over the 

 capsule to the neck of the femur to which it is attached. 



The Ligaments of the Knee-joint (Figs. 16 and 17). — The 

 knee-joint is made up of the femur, patella, tibia and fibula, and 

 is provided with the following ligaments: 



The ligamentum extero-laterale genu is a strong ligament extending 

 from the condylus externus femoris, or external femoral condyle 

 to the outer surface of the head of the fibula, or capitulum fibulae. 

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