File:Keibel Mall 309.jpg

Fig. 309 Human Embryo Skull

Membranous skull of an embryo 14 mm long.

The tissue of the capsules of the labyrinth increases in amount as the labyrinth becomes differentiated. The tissue which encloses the region of the semicircular canals and the vestibule forms an oval mass the outlines of which do not conform to that of the enclosed canals (Fig. 309). This tissue is less dense than most parts of the membranous skeleton of the head and at an early period becomes transformed into embryonic cartilage (see p. 407). The cochlear portion of the labyrinth (Fig. 310) is enclosed by a dense mesenchyme which becomes converted into cartilage at a later period. lateral from the nasal fossa the tissue becomes generally somewhat condensed, though less so than the tissue in the septum. In the perinasal tissue condensation gradually marks out the lateral and ventral portions of the nasal capsule and the membranous floor of the ethmoidal and orbital portions of the cranial cavity (Fig. 310). From the lateral wall membranous processes project into the nasal fossa. These are the anlages of the conchae.

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Cite this page: Hill, M.A. (2024, April 16) Embryology Keibel Mall 309.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_309.jpg

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