Archive image from page 456 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 THE EXTERNAL EAR 445 surface by an ectodermal and on the inner by an endodermal epithelium. The auricle {pinna) owes its origin to the portions of the first and second arches which bound the entrance of the external meatus. Upon the posterior edge of the first arch there appear about the end of the fourth week two transverse furrows which mark off three tubercles (Fig. 258, A, 1-3) and on the anterior edge of the second

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