60 



SECRETION. 



simple. The follicles which compose the simple glands, and 

 the follicular terminations of the simple and compound race- 

 mose glands, are formed of a delicate, structureless or slightly 

 granular membrane, with an external layer of inelastic and 

 small elastic fibres, and are lined by cells. Next the mem- 

 brane the cells are polyhedric, pale, and granular, most of 

 FIG. i. them presenting a nucleus and nu- 



cleolus; but the follicle itself con- 

 tains fatty granules and the other 

 constituents of the sebaceous mat- 

 ter, with cells filled with fatty 

 particles. These cells abound in 

 the sebaceous matter as it is dis- 

 charged from the duct. The great 

 quantity of fatty granules and 

 globules found in the ducts and 

 follicles of ' the sebaceous glands 

 renders them dark and opaque when 

 examined with the microscope by 

 transmitted light, and their ap- 

 pearance is quite distinctive. The 

 larger glands are surrounded with 

 capillary blood-vessels. 



The ceruminous glands of the 

 ear produce a secretion resembling 

 the sebaceous matter in many re- 

 gards, but in their anatomy they 

 are almost identical with the su- 

 doriparous glands. They belong 

 to the variety of glands called 

 tubular, and consist of a nearly straight tube which pene- 

 trates the skin, and a rounded or ovoid coil situated in the 

 subcutaneous structure. These glands are found only in the 

 cartilaginous portion of the external meatus, where they 

 exist in great numbers. They are rather more numerous 

 in the inner than in the outer half of the meatus. 



<gp v-^., 



A very large sebaceous gland from 



147 - ) 



