8o 

 THE ORGANS OF SPECIAL SENSE. 



LABORATORY WORK FOR THE-?*-' ___ WEEK. Vw-*x / -* ,/ 



References : <sJ^ -XVIM * t V 



^ Xx * ** \ b U- 



Points for Quiz : 



Laboratory Report : . _ 



Obtain from the delivery desk (a) paraffin sections 187, 188, 

 (b) collodion section 186. 



THE EAR. 



186. Middle ear, inner ear, semi-circular canals. 



; collodion ; sections yw. Stain with 



hematoxylin and eosin. 



Study this preparation for (a) the mucosa of the tympanum 

 and the character of the epithelium, () the bony labyrinth, mem- 

 branous labyrinth, perilymphatic space of the inner ear. Does the 

 section include one of the maculae or cristae of the membranous 

 labyrinth? Is the utricle sectioned as well as the semicircular 

 canals ? Note carefully the structure and relations of the parts. 



187. Cochlea. Guinea-pig. Longisection. Zenker's fluid ; 

 decalcified (131) ; paraffin ; sections ^. Stain with hema- 

 toxylin and eosin. 



Study this preparation in connection with figures in your text 

 book, identifying the parts and studying their structure. Is Reiss- 

 ner's membrane intact? 



THE TASTE BUDS. 



188. Papilla foliata. Rabbit. Longisection. Zenker's fluid ; 

 paraffin ; sections //. Stain with hematoxylin and eosin. 



The taste buds will be found in the epithelium in the depres- 

 sions or transverse fissures of the papilla. Examine them carefully, 

 observing their form and structure, relation to the surface, and the 

 gustatory hairs. 



