12 FRANKLIN PARADISE JOHNSON 



'special acinous glands' which have already been referred to as the 

 intramuscular glands. In regard to these last structures Herr- 

 mann states that he is not certain that they should be classified 

 as glands. He was able to find no trace of secretory epithelium 

 in them. He suggests that the term 'intramuscular sinus' would 

 probably be more appropriate for them. He is nevertheless cer- 

 tain, because of their peculiar disposition that they correspond to 

 the true acinous glands found in this region of the dog. Regard- 

 ing the structure of the intramuscular glands Herrmann states 

 that those in man are made up of polygonal cells which are similar 

 to those of the epithelium from which they arise. They extend 

 outward through the submucous layer, and, in contact with the 

 internal sphincter muscle, the tube of epithelium presents a 

 swelling which is lined with a cuboidal epithelium composed of one 

 to two layers of cells. The branches arising from this swelling 

 penetrate still further into the muscle and terminate in small 

 caecums in between the iimer circular and outer longitudinal 

 layers of muscle. Scattered along the tubes, and particularly 

 about their terminal ramifications, are found masses of lymphoid 

 tissue. 



Braun ('01) states that in the transition zone (zona intermedia) 

 can be found in some individuals, though not in all, free sebaceous 

 glands. Because he was unable to find any of Herrmann's 

 special acinous glands (intramuscular sinuses) he completely 

 denies their presence. He describes and figures, however, tube- 

 like structures (rohrenformige Anhange) which arise from the 

 secondary sinuses ('Sinuositaten'). These, however, were found 

 in the submucosa and did not pierce the internal sphincter muscle. 



Although the glands of the anal region in man have attracted 

 but little attention, those of the lower mammals have been more 

 thoroughly studied. Herrmann uses the term 'anal glands' to 

 denote the two large saccular glands of the dog. Besides these 

 he describes large intramuscular glands, which, unlike those of 

 man, open into the pars analis recti below the zona columnaris. 

 These are true acinous glands lined with secretory epithelium. 



Hebrant ('99) likewise describes under the term 'anal glands' 

 of the dog, the two saccular glands found one on either side of the 



