74 



(1) Stratum Malpighii (rete mucosa), composed of 

 stratified pavement epithelium. 



(2) Stratum granulosum, a narrow layer of cells 

 which contain kerato-hyalin granules (Waldeyer) in their 

 protoplasm. 



(3) Stratum lucidum, composed of horny cells the 

 outlines of which are very indistinct. 



(4) Stratum corneum, the thick outer layer. 

 Observe also the twisted portion of the sudoriferous 



glands passing through the epidermis. 



In the cutis vera an outer denser portion, the papillary 

 layer, is observed. This is composed of closely interwoven 

 bundles of white fibrous tissue, between which a small 

 amount of elastic tissue is found. This layer is beset with 

 papillae. In the deeper portion of the corium, the reticular 

 layer, the bundles of fibrous tissue are loosely woven. In 

 the large open meshes groups of fat cells and the secreting 

 portion of the sweat glands are found. Some of the prep- 

 arations may show a Vater-Pacinian corpuscle in section. 



Sketch the several layers of the epidermis and the 

 dermis as seen under low power. 



(d) Cross-Section of the Scalp. 



A portion of the scalp was hardened in Miiller's fluid, embed- 

 ded in celloidin, sectioned, and stained in hseinatoxylin and eosin. 

 The sections are in oil, and are to be mounted in balsam. 



In this section special attention is to be given to the 

 study of the hair and its follicle. An attempt was made 

 to cut them longitudinally. Examine first under low 

 power, and observe the several layers of the follicle, the 

 sebaceous gland seen in connection with it, and the 

 arrectores pili. Sketch under this power. 



(e) Tangential Section of the Scalp. 



This tissue was prepared as the cross-section. Mount in balsam. 



In this section the hair follicles are seen in cross-sec- 

 tion. Study under high power. 



Each follicle shows the following layers, named in 

 order from without, in : 



