EPITHELIAL TISSUES 



35 



1. Squamcms, 



((imposed of 

 flattened, 

 scale-like 

 cells. 



2. Columnar. 



chamber of lh<> eye, and of the perilymph spaces 

 of the internal ear. 



(b) Lining the alveoli of the lungs, some tulniles of 



the kidney, the middle ear, and the membranous 

 labyrinth of the internal car. 



(c) As the superficial cells of stratified epithelium 



(i-idc infra). 



(a) Lining the mucous membrane 

 of the alimentary tract stom- 

 ach, small intestines, large in- 

 testines, gall-bladder. 



(b) Lining the ducts of all secret- 

 ing glands liver, pancreas, sali- 

 vary, lacrimal, and mammary 

 glands, testicle, prostate, kidney, 

 etc. 



(c) The deepest layer of cells in 

 stratified epithelium is composed 

 of columnar-shaped cells, which, 

 however, differ in structure from, 

 the true columnar type. 



f (A) Plain 



(B) Modified 

 (1) Ciliated 



(2) Pyramidal 

 or 'glandular' 



(3) Goblet* 



(a) Lining the uterus and ovi- 

 ducts. 



(b) Lining portions of the ventri- 

 cles of the brain and central 

 spinal canal of the embryo and 

 infant. (In later life these cells 

 lose their cilia.) 



The secreting cells of all tubular 

 glands kidney, pancreas, sali- 

 vary glands, intestinal glands, 

 etc. 



(a) Respiratory tract nasal, 

 pharyngeal, tracheal, and bron- 

 chial mucous membranes. 



(b) Alimentary tract stomach, 

 small and large intestines. 



* Cells whose protoplasm has been converted into raucinogen. 

 be considered unicellular, mucus-secreting glands. 



They may 



