I02 EQUINE ANATOMY. 



Spermatic, IdIIovv the artery in male or female. 



Lumbar, follow arteries. 



Common iliacs. 



Unite under second lumbar body to form cava. 



The common and exte?'7tal iliacs follow the course of the 

 arteries and receive similar branches. 



Femoral vein follows artery, as does the popliteal, anterior and 

 poste7ior tibial. 



Internal saphena. 



Superficial in position from metatarsal veins, passes along inner 

 side of leg and thigh, and empties into femoral or external pudic. 



External saphena. 



Begins outside calx and ends in popliteal vein. 



Metatarsal. 



Internal, external and middle. 



Digital. 



As in anterior limb. 



PULMONARY VEINS. 



Are four to eight in number and extend from root of lung to 

 the left auricle. They carry arterial blood and are destitute of 

 valves. 



LYMPHATICS. 



The lymphatics are vessels with very thin and transparent 

 walls, found all over the body, except in blood-vessels, nervous 

 tissue, bone, muscles, eyeball, cartilage, tendons, the membranes 

 of ovum, placenta, umbilical cord, cuticle or hair. They possess 

 nutrient vessels, no nerves, have valves, and carry lymph or chyle 

 into the vascular system. 



The ly??iphatic glands are small ovoid bodies in the course of 

 lymph channels; they exist as groups in the sub-lumbar, inguinal, 

 popliteal, iliac, femoral, pre-pectoral, pharyngeal, pre-scapular, 

 inediastinal and bronchial regions. 



They have a special capsule and are composed of reticular 

 tissue. The lymphatics break up into smaller ones before reach- 

 ing the gland, called the afferent vessels, and are united again on 

 the opposite side as the efferent vessels. 



THORACIC DUCT. 



Receives all the lymphatics except those of the right side of 



