STRUCTURE OF THE EYELIDS. 



443 



Iii the lower segment of the anterior layer the sweat glands 

 are of quite different form. Each gland appears as a cylindrical 

 canal, which, commencing by a ccecal extremity, runs with a 

 slightly sinuous course. Whilst the other glands are arranged 

 vertically to the surface, and therefore, on account of the 

 thinness of the anterior integuments, can only be extremely 

 small, the glands of the lower segment just alluded to are 



Fig. 395. 



Fig. 395. Longitudinal section through the root of a cilium, 

 from a new-born child, seen with a Hartnack's microscope, ocular 3, 

 objective 7. a, Papilla of the hair ; 6, longitudinal fibrous membrane 

 of the hair follicle ; c, transversely striated muscle ; d, vitreous mem- 

 brane of the hair follicle ; e, cells of the external root-sheath ; /, layer 

 of cells covering the vitreous membrane of the papilla ; g, circular 

 muscular layer of the hair follicle. 



considerably larger. They run parallel to the surface; their 

 blind extremity is situated much higher, between the anterior 

 and middle lamellae, whilst the excretory duct of the gland 

 opens below, near the margin of the lid. The duct is circular 

 on section, and possesses a connective-tissue sheath sometimes 



