FIG. 17. VENTRAL ASPECT OF THE SKULL WITH THE LEFT AUDITORY 



BULLA REMOVED. 



asp, Alisphenoid; ap, anterior palatine foramina; bs, basisphenoid ; bl, 

 auditory bulla; bo, basioccipital ; c, canine tooth; e, petrous portion 

 of the temporal; en, occipital condyle; ea, external auditory meatus; 

 eh, opening of the Eustachian tube; fr, frontal; fm, foramen mag- 

 num; gc, glenoid cavity; gn, postglenoid process; hm, hamular pro- 

 cess of the pterygoid; ic, incisor tooth; if, infraorbital foramen; in, 

 incus; jg, jugular foramen; Id, lambdoidal ridge; mx, maxilla; ml, 

 molar tooth; mp, mastoid process; ms, mastoid portion of the tem- 

 poral ; ma, malar ; m, malleus ; osp, orbitosphenoid ; ov, foramen ovale ; 

 pi, palatine; pt, pterygoid; pn, promontory of the petrous; po, post- 

 orbital process ; pr, premolar teeth ; pm, premaxillary ; rd, fenestra 

 rotundum ; rt, foramen rotundum ; st, stapes ; sg, squamosal ; sf, stylo- 

 mastoid foramen ; tc, carotid foramen, or foramen lacerum medius ; 

 vm, vomer, forming the septum between the posterior nares; zg, 

 zygomatic process of squamosal. 



