446 



CONJUNCTIVA AND SCLEROTIC. 



duct is narrowest close to the funnel-shaped opening, where it 

 forms the neck of the excretory duct ; towards the fundus it 

 is beset with manifold dilatations termed the acini. Each 

 acinus is a spherical or ovate body, that appears rilled with 

 cells up to its opening into the excretory duct. There are 

 many points in each gland where several closely approximated 

 acini do not open into the principal excretory duct, but unite 

 to form a secondary duct, which then opens into the main 



Fig. 396. 



Fig. 396. Longitudinal section through a portion of a Meibomiaii 

 gland, from a new-born child, examined with a Hartnack, ocul. 3, 

 obj. 8. a, Excretory duct ; 6, acini ; c, laminated epithelium of 

 the excretory duct ; d, layer of cubical epithelial cells investing the 

 membrana propria ; e, epithelial cells of the acini containing fat. 



duct. In this case the latter appears considerably dilated at 

 such points. 



The epithelium of the principal excretory duct is laminated 

 and tesselated. The two or three superficial rows are flat- 

 tened, and contain oblong nuclei. They are succeeded by one 

 or two tiers of polyhedric cells with spheroidal nuclei, which 

 are again followed by a row of obliquely placed granular 



