312 



DISSECTION OF THE BABBIT 



Fig. 60. lepus cuniculus. — Diagrammatic section across the head 

 to show the relations of the internal ear, tympanic cavity and membrane 

 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. 

 58, p. 276. The external ears are cut short close to their bases, and the 

 flocoular 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-occipital. C, cochlea, CA, 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 Ungual 

 artery. M, malleus ; to its inner side are seen the incus and stapes. MM", man- 

 dible. MO, medulla oblongata. Jjf, posterior nasal chamber. F, soft palate. 

 PO, periotic. S, post-tympanic process of squamosal. SO, anterior vertical 

 semicircular canal. SO, supra-occipital. T, tympanic bone. TO, tympanic cavity. 

 TM, tympanic membrane. 



