394 LABORATORY MANUAL OF HUMAN ANATOMY 



(be) Inferior vestibular area (area vestibularis inferior). 



(bf) Isolated foramen (foramen singulare). 



Membranous Labyrinth (Labyrinthus membranaceus). (Vide Fig. 



I95-) 1 



In the membranous labyrinth the following structures are to 

 be studied : to make out some of them, sections should be exam- 

 ined under a hand-lens or the dissecting microscope. The whole 

 internal ear is simple if approached from the embryological side. 

 (Cf. Kollmann, Minot, McMurrich, et al.) 



(a) Endolymphatic duct (ductus endolymphaticus) . 



(b) Endolymphatic sac (saccus endolymphaticus). 



(c) Utriculosaccular duct (ductus utriculosaccularis) . 



(d) Utricle (utriculus). 



(e) Semicircular ducts (ductus semicirculares) . 



(ea) Superior (ductus semicircularis superior). 



(eb) Posterior (ductus semicircularis posterior). 



(ec) Lateral (ductus semicircularis lateralis) (0. T. external). 



(f) Membranous ampullae (ampullae membranaceae) . 



(1) Ampullary sulcus (sulcus ampullaris). 



(2) Ampullary crest (crista ampullaris). 



(fa) Superior (ampulla membranacea superior). 



(fb) Posterior (ampulla membranacea posterior). 



(fc) Lateral (ampulla membranacea lateralis). 



(g) Saccule (sacculus). 



(h) Uniting duct (ductus reuniens [ Henseni] ) (0. T. canalis reuniens). 

 (i) Acoustic spots (maculae acusticae). 



(ia) In utricle (macula acustica utriculi). 



(ib) In saccule (macula acustica sacculi). 

 (j) Ear-stones (otoconia). 

 (k) Endolymph (endolympha). 

 (1) Perilymph (perilympha). 



(m) Perilymphatic space (spatium perilymphaticum) . 

 (n) Perilymphatic ducts (ductus perilymphatici) . 



(o) Cochlear duct (ductus cochlearis) (0. T. membranous cochlea, or 

 scala media). 



(oa) Cupular blind sac (caecum cupulare). 



(ob) Vestibular blind sac (caecum vestibular e) . 



(oc) Basilar layer (lamina basilaris). 



(od) Vestibular membrane of Reissner (membrana vestibularis 

 [Reissneri]) . 



(oe) Spiral ligament of cochlea (Lig. spirale cochleae). 



(of) Spiral prominence (prominentia spiralis). 



(og) Vascular stripe (stria vascularis). 



'For an. account of the blood supply of the inner ear, consult " The Distri- 

 bution of the Blood-vessels in the Labyrinth of the Ear of Sus scrofa domes- 

 ticus," by G. E. Shambaugh, in Decennial Publications, vol. x., of the University 

 of Chicago, Univ. of Chic. Press, 1903. 



