The development of the human body; a manual of human embryology . B Fig. 239.—Diagrams Representing the Development op a Circum- vallate Papilla. a, Valley surrounding the papilla; b, von Ebners gland.—(Graberg.) circumvallate and foliate papillae of the tongue, and of theformer one of the earliest observed stages has been foundin embryos of 9 cm. in the form of two ridges of epidermis,lying toward the back part of the tongue and inclined toone another in such a manner as to form a V with the apexdirected backward. From these ridges solid down-growths of epidermis into the subjacent tissue occ
The development of the human body; a manual of human embryology . B Fig. 239.—Diagrams Representing the Development op a Circum- vallate Papilla. a, Valley surrounding the papilla; b, von Ebners gland.—(Graberg.) circumvallate and foliate papillae of the tongue, and of theformer one of the earliest observed stages has been foundin embryos of 9 cm. in the form of two ridges of epidermis,lying toward the back part of the tongue and inclined toone another in such a manner as to form a V with the apexdirected backward. From these ridges solid down-growths of epidermis into the subjacent tissue occur, eachdowngrowth having the form of a hollow truncated conewith its basal edge continuous with the superficial epider-mis (Fig. 239, A). In later stages lateral outgrowths de-velop from the deeper edges of the cone, and about thesame time clefts appear in the substance of the original THE ORGANS OF TASTE. 459 downgrowths (Fig. 239, B) and, uniting together, finally-open to the surface, forming a trench surrounding a pa-pilla (Fig. 239, C). The lateral out
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
