LYMPHATIC SYSTEM OF 'tHE OX AND SHEEP 733 



width about an inch (ca. 2.5 cm.) in the^aclult, but it may be considerably larger. 

 In some cases a second small gland is present above or below the large one. It 

 receives afferent vessels from the skin of the posterior part of the thorax, the ab- 

 domen, pelvis, thigh, and leg; also from the tensor fasciee latae and the prepuce. 

 The efferent vessels ascend on the deep face of the tensor fasciae latse and end 

 chiefly in the deep inguinal gland, but in some cases some go to the iliac glands. 



The popliteal Ijrmph gland (I^g. poplitea) is situated in a mass of fat on the 

 gastrocnemius muscle, behind the tibial and peroneal nerves and between the biceps 

 femoris and semitendinosus. Its average length is about an inch and a half (ca. 

 3^ cm.) and its width about an inch (ca. 2-3 cm.). The gland receives afferent 

 vessels from the lateral and posterior part of the leg and from the distal part of the 

 limb; vessels from the biceps femoris and semitendinosus also go to it. The 

 efferent vessels go chiefly to the deep inguinal gland, but some end in the ischiatic 

 or internal iliac glands. 



The coxal lymph gland (Lg. coxalis) is situated in front of the proximal part of 

 the quadriceps femoris, under cover of the tensor fascise latee. It is present in the 

 majority of subjects on one side or both and may be an inch or more (ca. 2.5-3 cm.) 

 in length. It receives vessels from the quadriceps femoris, tensor fascise latae, 

 fascia lata, and the prefemoral gland. The efferent vessels go to the iliac or the 

 deep inguinal glands. 



One or two lymph glands are commonly present on the superficial face of the 

 tensor fasciae latse, an inch or two from the anterior border of the muscle and five 

 or six inches from the tuber coxae. They are often partially embedded in the muscle, 

 and are usually small, but may be almost an inch (ca. 2 cm.) long. Haemolymph 

 glands may be found here and in some cases appear to take the place of the lymph 

 gland. The afferent vessels come from the skin of the hip and the efferent vessels 

 go to the prefemoral or deep inguinal gland. 



The lymph glands of the sheep resemble in general those of the ox, but a few 

 special features may be noted. Hemolymph glands are numerous, especially along 

 the course of the aorta; they are dark red or black and hence are easily seen, in 

 spite of their small size, in the fat in which they are chiefly embedded. 



The mandibular lymph glands are usually two in number on each side, and are 

 situated behind the angle of the jaw on the course of the external maxillary vein. 

 The larger one is flattened and kidney shaped and may be nearly an inch (ca. 2 cm.) 

 long. 



The parotid lymph gland Hes on the posterior border of the masseter muscle, 

 about midway between the mandibular joint and the angle of the jaw. It is 

 related to and commonly partly covered by the anterior border of the parotid 

 salivary gland. It is flattened and has a deep notch posteriorly. It is usually a 

 little less than an inch (ca. 2 cm.) long. 



The suprapharyngeal lymph glands, two in number, have an elongated oval 

 outlme. They are situated on the dorsal wall of the pharynx, a quarter of an inch 

 or less (ca. 0.5 cm.) apart. They are related laterally to the dorsal end of the great 

 cornu of the hyoid bone, and dorsally to the ventral straight muscles of the head. 

 They are about an inch (ca. 2-3 cm.) long, and half as wide. 



The atlantal lymph gland is related to the ventral part of the paramastoid 

 process and is dorsal to the carotid artery. It is discoid, oval in outline, and about 

 half an inch (ca. 1.5 cm.) long. Commonly there is a small node behind the at- 

 lantal gland and one or more haemolymph glands occur here. 



The sternal Ijonph gland, which overhes the first segment of the sternum, is 

 about the size of a hazel nut. 



The mesenteric lymph glands consist chiefly of long narrow elongated masses 

 instead of isolated small nodes. 



The prefemoral lymph gland is in front of the anterior border of the tensor 



