624 



THE BLOOD-VASCULAR SYSTEM OF THE OX 



The middle cervical lymph glands comprise a series of small nodes along the 

 dorsal face of the trachea. 



In the sheep and goat there is a lymph gland at the middle of the neck, in the angle between 

 the spinalis and complexus, covered by the splenius. It receives vessels from the atlantal gland 

 and sends eflferents to the prescapular gland. 



The prescapular or superficial cervical l5miph gland is situated at the anterior 

 border of the supraspinatus under cover of the mastoido-humeralis and omo-trans- 

 versarius. It is elongated and may be an inch or more in width and four or five 

 inches long. Two occur in exceptional cases. 



A chain of hsemolymph glands lies along the front of the shoulder, covered above by the 

 trapezius. Others are frequently found (in the calf especially) on the surface of the omo-trans- 

 versarius at the point where it passes under the mastoido-humeralis (Forgeot). 



The posterior cervical or prepectoral lymph glands number commonly three 

 or four on each side. One or two are placed on the brachial vessels, one below the 



n 



P'lo. 478. — Superficial Lymph Glands of Cow Projected on Surface of Body. 

 7, Submaxillary; 2, .subparotid; <5, atlantal; 4. I>arapharyngeal; 5, anterior cervical; S, middle cervical; 7, pre- 

 scapular; 8, precrural. (With use of fig. in Ellenberger-Baum, Anat. f. Kimstler.) 



brachial vein at the first rib, and one at the junction of the common trunk of the 

 external and subcutaneous thoracic veins with the brachial. 



The intercostal lymph glands are situated, as in the horse, at the upper parts 

 of the intercostal s]:)a('(\s. Associated with them are hiemolymph glands. 



The sternal lymph glands are situated along the course of the internal thoracic 

 artery at the lower part of the intercostal spaces. The largest is close to the 

 thoracic inlet. Several glands occur in the fat about the apex of the pericardium. 



4. Several anterior mediastinal lymph glands are placed along the oesophagus 

 and the trachea.' HaMnolyinpli glands occur here also. 



Usually three large bronchial lymph glands are ]:)resent (Fig. 289). One is 

 situated at the origin of each chief bronchus and the third is under the trachea at 

 the origin of tlie special bronchus of the apical lol)e of the right lung. Another 



' The upper series is conlimious with the posterior mediastinal (oesophageal) glands and the 

 lower or tracheal glands with the bronchial. Hence we might well designate the mediastinal 

 glands as ujsophageal (anterior and posterior) and tracheo-bronchial. 



