67 

 THE SKIN AND ITS APPENDAGES. 



LABORATORY WORK FOR THE WEEK. 



References : 

 Points for Quiz : 



Laboratory Report : 



Due : 



Obtain from the delivery desk (a) assigned slides 152 and 154, 

 {b) paraEBn sections 150, 152, 157, 158 and 159, {c) collodion sec- 

 tions 149, 151, 156, («?) 153 will be sectioned in your presence dur- 

 ing the week ; read §§ 61-63. 



THE SKIN. 



149. Skin of palm or heel. Homo. Vertical section 



; collodion ; sections fx. Stain with hematoxylin and 



picrofuchsin. 



Identify epidermis and corium ; in the former recognize the 

 layers and study their structure ; are the layers of the corium dis- 

 tinguishable ? Search the preparation carefully for sweat glands ; 

 corpuscles of Meissner may be present in the papillae of the corium. 

 Are inter-cellular bridges shown in the stratum Malpighii ? 



(17). Skin of palm or heel. Homo. Surface section 

 (slightly oblique). Preparation already made (17). In this prep- 

 aration note {a) the inter-cellular bridges of the cells of the Mal- 

 pighian layer and the relation of the deepest cells next the corium 

 to the connective tissue, (6) the transected papillae of the corium. 



150. Skin, general body surface. Homo. Vertical section. 



; paraffin ; sections fx. Stain with hematoxylin 



and picrofuchsin. Study this preparation carefully in comparison 

 with 149, identifying the epidermis and corium, the layers compos- 

 ing them, and the relative development of each. Does the section 

 show the presence of hairs? Sweat glands? 



151. Lip. Homo. Transection. ; collodion ; sec- 

 tions IX. Stain with hematoxylin and picrofuchsin. 



