272 DEVELOPMENT OF SALR'ARY GLANDS IN THE DOMESTIC CAT 



the orbit, where all have numerous short branches, those of the third 

 order terminating in retort-shaped enlargements. The bodies of the 

 glands are disposed in an obUque row, the first lateral and cranial, and 

 overlapping the second, as that in turn does the tliird at the caudomesal 

 end of the series. They are surrounded by an area of moderately dense 

 mesenchyme, which gradually merges into the loose tissue at the bottom 

 of the orbit. All of the ducts have pale centers e.vcept in their smaller 

 branches and at their attachments, which still preserve a keel-like 

 form. 



The first element is distinctly the largest. Its duct is attached 

 to the crest of the stomal ridge opposite the interval between the last 

 and penultimate dental anlages. Its duct diverges gradually from the 

 epithelium and farther caudad is ectal and dorsal to that of the 

 second orbital (Figs. 111-113, 20). As it turns dorsad to enter the 

 orbit it forks, and these primary branches continue dorsad for some 

 distance before secondary sprouts appear. They supply cranio- 

 lateral and caudomesal lobes of about equal size. 



The duct of the second element (2/) begins opposite the last dental 

 anlage, and turns dorsad at a shghtly more caudal point than the first. 

 Caudomesal to the body of the first, it divides dichotomously into 

 branches studded with soUd sprouts. A considerable number of the 

 third order are present. 



The third orbital {22) is distinctly smaller, its duct shorter and arising 

 from the oral epithelium beneath the body of the second gland, at an 

 interval appreciably greater than that between the first and second. 

 In the orbit its duct is irregularly enlarged, and gives off several tliick 

 short secondary branches. 



The general relations of the bodies of the glands are little changed. 

 Lateral to the first is the deep facial vein ; the orbital inclusion on a 

 more ventral level terminates in the plane of the second element. 



In the 70 millimeter embryo the three orbitals, while greatly enlarged, 

 oft'er no material changes in disposition (Fig. 114, 20-22). The stomal 

 ridge is prominent and forms an elongated conve.xity immediately 

 below the superior alveobuccal furrow from the orifice of the parotid to 

 the plane of the body of the first orbital, where it gradually disappears. 

 Its ventral margin is marked against the plane of the cheek by a shallow 

 furrow which extends from the parotid orifice to that of the third orbi- 



