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 largel}' of radiating fibers, but many interlace in various directions; 

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

 A strong tendinous layer extends across below the hiatus oesophageus. 



Longissinms dorsi 



Lumbar transverse 

 process 



Costal arch 

 Af^tcrnal artery 



Transversus 



abdoniDiis {cut 



edge) 

 Xiphoid cartilage 



{d( pressed) 



Fir,. 185. — DiAi'iiHAfiM OP IIoksk, Abdomin.\i. Surface. 

 /, Inferior common ligament; 3, 2' , tendons of crura; S, lumbar sympathetic trunks; 4, external spermatic 

 nerve; .5, r,, great .splanchnic nerves; 5, cisterna ohyli (opened); 7, 7, o-sophageal continuations of vagus nerves; 

 8, lymph-gland; 9, coronary ligament of liver (cut); W, rijilit lateral ligament of liver (cut); 11, left lateral liga- 

 ment of liver (cut); /^, falciform ligameit of liver (cut ^: .1./., lumho-costal arch; .V.j., intercostal nerve; C.d., 

 right crus; C'.s., left crus; .1, aorta; Cn. cu'liac artery; Oc, oesophagus; T.c, ])osterior vena cava; T. p., phrenic 

 veins, (.\fter Schmaltz, .Vtias d. .\nal. d. Ffcrdos.) 



The (liaphragiu is pi(>rce(l ])y three foramina. (1) The hiatus aorticus is an 

 interval between the two crura and below the last thoracic vertebra. 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 



