GENERAL ANATOMY. 



93 



grows as a cylindrical cord or tube from the surface down 



into the deeper layers of tissue; 



this cord of cells seldom remains 



simple ; it usually branches and d -\ 



forms the compound glands, 



which may consist of hundreds 



or thousands of glandular 



pouches, all emptying into a 



common duct. Among the 



multicellular glands are to be 



distinguished tubular and acin- 



ous forms. In the case of the 



tubular glands (Fig. 28) the 



simple or branched glandular 



preserve the Same tubu- FIG. 27. Unicellular glands from edge 



of the mantle of Helix poinatia. e, 



Calibre from beginning tO epithelium; </, unicellular glands ; /, 



pigment cells. 



end ; in the acinous glands (Fig. 



29), on the contrary, the blind end of the glandular pouch 



widens into a swelling, which chiefly comprises the Secre- 



te. 28. Tubular glands. (After Toldt.) A, glands of Lieberkuhn from the human intes- 

 tine ; A', of the conjunctiva of the eye; B, of the cat's stomach; C, from the pyramids 

 -of the dog's kidney; Z>, from the cortex of the rabbit's kidney. 



tory cells, and is related to the anterior part of the glandu- 

 lar pouch, the duct, as grapes are to their stem. To the 



