CLASSIFICATION OF GLANDS. 23 



Classification of Glands.* 



Class A. Unicellular. 



Class B. True Glands, always developed with ducts. 



Division i. Simple Glands (unifollicular or single glands). 



a. Ectodermal. 



1. Sweat glands. 



2. Sebaceous glands. 



3. Buccal glands. 



b. Entodermal. 



- i. (Esophageal. 



2. Gastric. 



3. Intestinal. 



c. Mesothelial. 



i. Uterine. 



Division 2. Compound Glands (organic or true compound glands). 

 Type a, ductic epithelial branching (with capillary circulation). 



1. Ectodermal. 



Salivaries, tear gland, Harderian. 

 Mammary. 



2. Entodermal. 



Pancreas. 



3. Mesothelial. 



Appendicular glands of the urogenital system. 

 Type b, ductic anastomosing (with sinusoidal circulation). 



1. Liver. 



2. (Paraphysis ?) 



Type c, ductless epithelial (with secondary obliteration of the duct). 



1. Thyroid. 



2. Hypophysal gland. 



3. Infundibular gland. 



4. Pineal gland (epiphysis). 



Class C. False Glands, never developed with ducts. 



Division i. Epithelioid Glands (? exclusively entodermal). 



1. Parathyroid. 



2. Islands of the pancreas. 



3. Carotid. 



4. Thymus. 



Division 2. Mesenchymal ductless Glands. 



1. Suprarenal cortex. 



2. Coccygeal gland. 



3. Interstitial cells of genital glands. 

 Class D. Cytogenic Glands. 



Division i. Lymphaal structures; producing mesamceboids . 



1. Lymph glands and follicles. 



2. Hemolymph glands. 



* The present table is a modification of the classification of glands proposed by the author in 1905 (Amer. 

 Journ. Anat., iv, 256). The principal change is in putting the cytogenic glands in a class by themselves, as should 

 have been done originally. 



