. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 362 TEXT-BOOK OF EMBRYOLOGY. The olfactory plates become separated from the fore-brain vesicle and consequently from the later brain and its out- growth, the olfactory bulb, by the development of an inter- vening bony plate, the cribriform lamina of the ethmoid bone. The ectodermic cells of the olfactory plates differen- tiate into the highly specialized neuro-epithelial elements of the olfactory mucous membrane, the olfactory epithelium, and their associated supporting cells. The axons of the n
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 362 TEXT-BOOK OF EMBRYOLOGY. The olfactory plates become separated from the fore-brain vesicle and consequently from the later brain and its out- growth, the olfactory bulb, by the development of an inter- vening bony plate, the cribriform lamina of the ethmoid bone. The ectodermic cells of the olfactory plates differen- tiate into the highly specialized neuro-epithelial elements of the olfactory mucous membrane, the olfactory epithelium, and their associated supporting cells. The axons of the neuro- epithelial cells pass upward through the cribriform plate of the ethmoid bone as the olfactory nerve-fibers, and, entering the ventral surface of the olfactory bulb, arborize with the processes of the mitral cells of the bulb, whereby they acquire functional relationship with the olfactory centers in the Fig. 173.—Cross-section through the head of an embryo pig 3 cm. ( in.) long, crown-rump measurement. The nasal cavities are seen to be in communication with the oral cavity at the places designated by a *: K, cartilage of the nasal sep- tum ; m, turbinal cartilage; J, organ of Jacobson; J', the place where it opens into the nasal cavity; gf, palatal process; of, maxillary process; zl, dental ridge (Hertwig). The external nose, as previously stated, first acquires defi- nite form about the eighth week by the union of the distal ends of the lateral nasal processes with the nasofrontal proc- ess, the former producing the alae and the latter the bridge and the tip of the nose. In the third month the organ is unduly flat and broad, but from this time on it gradually assumes the familiar characteristic form. From the third month to the fifth each external naris is closed by a gelat- inous plug of epithelial Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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