DISSECTION OF THE HEAD AND NECK 



395 



(P) 



(oh) Spiral sulcus (sulcus spiralis). 



(oi) Tympanic lip (labium tympanicum) . 



(oia) Openings for nerves (foramina nervosa). 

 (oj) Vestibular lip (labium vestibulare). 

 (ok) Spiral ganglion of cochlea (ganglion spirals cochleae), 

 (ol) Spiral organ of Corti (organon spirale [Cortii]). (Fig. 197.) 

 Vessels of internal ear (vasa auris internae). (Cf. articles by Sieben- 

 mann and by Shambaugli. ) 



FIG. 196. 



Section through the cochlear region of the labyrinthus osseus et membranaceus of a guinea-pig. 



I, scala vestibuli ; m, labium vestibulare of the limbus ; w, sulcus spiralis ; o, medullated peripheral 

 fibres arising from cells in the ganglion spirale and being distributed to the organon spirale (Cortii) ; 

 p, perikaryons in the ganglion spirale ; q, blood-vessel ; a, bone ; b, membrana vestibularis (Reissued i ; 

 DC, ductus cochlearis ; d, Corti's membrane ; /, prominentm spiralis ; h, ligamentum spirale cochleae ; 

 i, lamina basilaris ; k, scala tympani. (After A. A. Boehm and M. von Davidoff, Lehrbuch der Histologie 

 des Menschen, etc., Wiesb., 1895, S. 362, Fig. 243.) 



Arteries. 



(pa) Internal auditory artery (A. auditiva interna). 



Of what is it a branch? 

 (paa) Vestibular rami (rami vestibulares) . 



