398 THE SKIN AND ITS APPENDAGES. 



has been stated, a very wide distribution, we may also class certain skin 

 glands, grouped under the term of "modified sweat-glands," which 

 show certain structural and morphologic peculiarities and are found 

 in special regions of the body. To these belong the axillary 

 glands, the circumanal glands, the ciliary glands or glands of 

 Moll of the eyelid, and the ceruminous glands of the external 

 auditory canal. The axillary glands resemble the sweat-glands in 

 shape and structure, possessing, however, larger and longer tubules. 

 The coiled portions of these glands measure 1.5 to 2 mm., the 

 tubule of the coil attaining a length of 30 mm. In the circumanal 

 region are found several types of sweat-glands, especially in an 

 area having the form of an elliptical ring with a width of about 1.5 

 cm. and situated about 1.5 cm. from the anus. In this region there 



Fig. 322. Model of a sebaceous gland with a portion of the hair follicle, reconstructed 

 by Bern's wax-plate method. A, Hair follicle. 



are found large sweat-glands, known as the circumanal glands of 

 Gay ; branched sweat-glands of the type of tubulo-alveolar glands ; 

 sweat-glands with relatively straight ducts, ending in a relatively 

 large saccule or vesicle, from which arise secondary tubules or 

 alveoli; and, finally, sweat-glands of the type as found in other 

 regions of the body. The ciliary glands or glands of Moll may 

 also be classed as branched glands of the type of tubulo-alveolar 

 glands, with relatively large vesicles. The ceruminous glands are 

 branched tubulo-alveolar glands. 



2. The Sebaceous Glands. The distribution of the sebaceous 

 glands in the skin is closely connected with that of the hair follicles 

 into which they pour their contents. Exceptions to this rule occur 



