376 



DISSECTION OF THE BABBIT. 



Fig. 64. — Lepus cunioulus. Diagrammatic section across the head to 

 show the relations of the internal ear, tympanic cavity and mem- 

 brane, and the auditory ossicles. The section Is drawn as seen from 

 the front, and is taken along a line joining the reference letters 

 SO and MN in fig. 59, p. 295. The external ears are cut short, 

 and the floccular lobes of the cerebellum, which lie between the 

 three semicircular canals on each side, are omitted entirely. 

 (a. m. m.) 



B, buccal cavity. BO, basi-oct;ipital. C.coelilea. C A, right external carotid 

 artery. OE, cerebellum. E, external ear or pinna. EM, external auditory 

 meatus. BT, Eustachian tube. H, body of the hyoid. LA, right lingual 

 artery. M, malleus : to its inner side are seen the incus and stapes. MXT, man- 

 dible. MO, medulla oblongata. N, posterior nasal chamber. P, soft palate. 

 PO, periotio. S, post-tympaiiio process of squamosal. SO, anterior vertical 

 semicircular canal. SO, .supra-oooipital. T, tympanic bone. TO, tympanic 

 cavity. TM, tympanic membrane. 



