Journal of morphology (1892) (14780648684)

Identifier: journalofmorphol1892wist (find matches)

Title: Journal of morphology

Year: 1892 (1890s)

Authors: Wistar Institute of Anatomy and Biology

Subjects:

Publisher: Philadelphia, Wistar Institute of Anatomy and Biology

Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

Text Appearing Before Image:

(xmt Cut 21. — The ear of a veryyoung Rabbit embryo, 11 mm.long. Figure after Krause. a Anterior canal. ant Ampulla. d Ductus endolymphaticus. / Lagena. J Sacculus. u Utriculus.

Text Appearing After Image:

Cut 22. — The internal ear of a some-what older Pig embryo, t^t, mm. long.Figure after Krause. a Anterior canal. am Ampulla. d Ductus endolymphaticus. I Lagena. P Posterior canal. s Sacculus. u Utriculus. fully cut off from the exterior (and this occurs in embryos 6 mm.long), the auditory vesicle forms a compressed sac, having anirregular quadrangular shape. The utricular and saccular divis-ions are readily distinguished, and already the semicircularcanals have begun to differentiate by the formation of twoshallow depressions in the wall of the utriculus (of authors)(Cut 2i) ; both the pocket common to the vertical canals and No. I.) THE VERTEBRATE EAR. 189 the pocket for the horizontal canal are present. Below thepocket for the horizontal canal is seen the larger and deeperevagination for the cochlea. When the embryo has reached alength of 8 mm., the cochlea has so far developed as to standout distinctly from the sacculus, and is at the same time some-what bent. At both ends of the

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1892

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