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Fig. 12A. —Drawings reveal development of external, middle, and inner ear. Gray area = cartilage condensations of neural crest origin, areas with horizontal lines = ectoderm, areas with diagonal lines = endoderm. First branchial cleft (FBC) will become external auditory canal, first branchial pouch (FBP) will become auditory canal (eustachian tube) and tympanic cavity, and otic vesicle (OV) (ectodermal derivative) will give rise to membranous labyrinth. Ossicles (OC) are formed from cartilage condensations of neural crest origin. EA = endolymphatic appendage, AH = auricular hillocks.