A text-book of the diseases of the ear for students and practitioners . culi, which is located on its medial surface,has a breadth of 1-2 mm. Alexander* found in the ductus reuniens of the * Zur Anatomie una EntwicMung der Pars inferior des Sanger-labyrinthes (M. f. 0., 1897); and Denkschr. d. k. Acad. d. Wissensch.,1900. THE SACCULE AND UTRICLE 689 embryo (guinea-pig) the beginning of a macula acustica which recedes inthe further course of development, and which must be regarded as thehornologue of the macula lagenae of the fish and amphibians. The vestibular cul-de-sac of the cochlea is seen
A text-book of the diseases of the ear for students and practitioners . culi, which is located on its medial surface,has a breadth of 1-2 mm. Alexander* found in the ductus reuniens of the * Zur Anatomie una EntwicMung der Pars inferior des Sanger-labyrinthes (M. f. 0., 1897); and Denkschr. d. k. Acad. d. Wissensch.,1900. THE SACCULE AND UTRICLE 689 embryo (guinea-pig) the beginning of a macula acustica which recedes inthe further course of development, and which must be regarded as thehornologue of the macula lagenae of the fish and amphibians. The vestibular cul-de-sac of the cochlea is seen as a protrusion of the canalsof the cochlea, and develops at a comparatively later stage. The saccule and utricle consist of a fibrillated connective-tissue layer, to whicha structureless, homogeneous, hyaline membrane, and an epithelial layer areattached. The connective-tissue layer is most fully developed at the maculaeacusticae. The epithelial stratum is formed by a simple layer of squamousepithelium. This variety becomes cylindrical at the maculae acusticae, and. Fig. 309. — The Membranous Internal Ear of a Human EmbryFive Months Old. Enlarged ten times (from behind and within).(After Retzius.) up, Utriculus proprius; re, Reeessus utriculi ; 8, Sacculus ; ss, Sinus utriculisuperior ; sp, Sinus utriculi posterior ; cH, Canalis reuniens Henseni; a, Ampullaanterior; ap, Ampulla posterior; ca, Canalis semicircularis anterior; ce, Canalissemicircularis lateralis ; de, Ductus endolymphaticus ; ra, Nervus vestibularis ; Nervus facialis ; np, Nervus ampullaris inferior. then passes into neuro-epithelium (Fig. 311), which is composed of acousticand fibrecells (Hasses Isolationszellen). The former—namely, the acousticcells—have a bottle-shaped appearance with a bulging in the middle, and aprojection at the free extremity. The structures known as the auditory ciliaconsist, according to Retzius, of ten to fifteen filaments, which are 20-25 a*in length. The elliptical nucleus lie
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