PELVIC LIMBS 



055 



The Tarsus has seven tarsal bones : the astragalus, the calcaneum, 

 the scaphoid, the entocuneiform, the mesocuneiforrn, the ectocunei- 

 form, and the cuboid. 



The Metatarsus has five metatarsal bones. 



Inasmuch as the first digit or great toe is rudimentary in the cat, 

 the distal part of the foot is supported by four series of phalanges, 

 every series comprising three phalanges. 



THE INNOMINATE BONE. 



FIG. 516. 



Vertebral Column. 



Hyoid. 



Clavicle. 

 Sternum. 



Metacarpus. 



Metatarsus. 

 Phalanges. 



THE SKELETON OF THE CAT. (LEFT SIDE ONLY.) 



General Description. The Innominate or Hip Bones form the 

 ventral wall and the sides of the pelvis (Fig. 516). They are united 

 below, but are separated above by the sacrum. 



Each innominate bone is constituted of three elements, which are 

 separate in early life but so coalesced in one mass in the adult that 

 their boundaries are more or less artificial. A fourth bone, which lies 

 at the junction of the other three and unites with one o'f them, is 

 present in the cat, but is not always found in the innominates of 

 mammals. The three bones which constitute the innominate are the 

 ilium, the ischium, and the pubes. They are arranged around the 

 cup-shaped articular cavity, or acetab'ulurn, 1 which lies on the ex- 

 ternal surface (Fig. 517). 



The ilium is the solid, elongated part which projects upward, 

 forward, and outward, and articulates with the sacrum. Its lower 



1 A shallow vessel. 



