Sthohr's histology : arranged upon an embroyological basis (1906)
Sthohr, Philipp, 1849-1911, Lewis, Frederic Thomas, 1875 · Philadelphia : P. Blakiston's Son & Co. · leaf 177
[66 HISTOLOGY. these structures are rudimentary; if their closing plates ever rupture theyare soon restored so that permanent openings from the pharynx on the sideof the neck are not found. In mammals four clefts are indicated by ecto-dermal depressions as shown in Fig. 187. Posterior to the mouth… … Fig. 186.—Head of a Young Dog-fish.g. c, Gill cleft; m., mouth; n., nasal pit; sp., spiracle. Fig. 187.—Head of Human Embryo of10 mm. c. s., cervical sinus; g. c. 2., second gill cleft;h., hyoid arch; m., mouth; md., man-dibular process; n., nasal pit; sp., audi-tory (spiracular) groove.
Histology · Microscopy
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