244 



FASCIA AND MUSCLES OF THE HORSE 



tially divided into right and left halves by the descent of the crura into it. It is 

 composed largely of radiating fibers, but many interlace in various directions; 

 this is specially evident around the foramen venae cavae, which is encircled by fibers. 

 A strong tendinous layer extends across below the hiatus a?sophageus. 



Longissinnis dorsi 



Lumbar trcmsrer&c 

 process 



Costal arch 

 A^ttrnul artery 



Transverszis 



abdominis {cut 



edge) 

 Xiphoid cartilage 



{depressed) 



Fig. 185. — Diaphragm of Horse, Abdominal Surface. 

 1, Inferior common ligament; 3, 2' , tendons of crura; 3, lumbar sympathetic trunks; 4. external siiermatic 

 nerve; .5, 5, great splanchnic nerves; 6, cisterna chyli (opened); 7, 7, cesophageal continuations of vagus nerves; 

 8, lynii)h-gland; 9, coronary ligament of liver (cut); 10, right lateral ligament of liver (cut); 11, left lateral liga- 

 ment of liver (cut); 12, falciform ligatnent of liver (cut); A.I., lumbo-costal arch; N.i., intercostal nerve; C.d., 

 right cms; C.s., left crus; A, aorta; fa, cociiac artery; Oe., cesophagus; I'.c, i)Osterior vena cava; V .p., phrenic 

 veins. (After Schmaltz, Atlas d. Anat. d. Pferdes.) 



The diaphragm is pierced by three foramina. (1) The hiatus aorticus is an 

 interval between the two crura and below the last thoracic verte])ra. It contains 

 the posterior aorta, vena azygos, and cisterna chyli. (2) The hiatus oesophageus 

 (or foramen sinistrum) perforates the right crus near its junction with the tendinous 



