30 
MAMMALIAN ANATOMY 
epidermis composed of a stratified cuboidal epithelium only two 
cells thick. Note the thick cuticular border of the cells of the 
outer layer and the numerous distended secretory cells of the 
inner layer. 
8. Vertical and tangential sections through an unpigmented 
region of the skin of an adult salamander (e.g., Desmognathus or 
Eurycea) showing an epidermis composed of a stratified epithelium 
of several layers, the outer squamous in form ( cf. surface mounts 
of conjunctiva used for mitosis, p. 28) while numerous multi¬ 
cellular alveolar or acinous glands will be seen to lie below the 
general level of the epidermis, through which their slender ducts 
pass to reach the external surface. 
9. Surface mounts of small pieces of the moult of an adult 
salamander showing the external layer of squamous cells which 
have thus been cast off. Look for gland pores in this. 
ro. Vertical sections through the skin of a human fetus show¬ 
ing an epidermis composed of stratified epithelium of many layers, 
the outer squamous in form. If developing sweat glands and 
hairs are present in the sections, note their relation to the deeper 
layers of epithelial cells. 
11. Vertical section through the lining of the mouth of some 
mammal showing a stratified epithelium of many layers, the outer 
squamous in form. (Cf. study of fresh cells scraped from the 
inside of the human mouth, p. 20.) 
12. Transverse section through the mammalian oesophagus 
showing a vertical section through its much folded squamous 
epithelial lining. 
