Histogenesis of the Oesophagus of Guinea Fowl (Numida meleagris) at Prehatch and Posthatch

Figure 2

Sections of the primordial oesophagus on the 13th (a) and 19th (b and c) days of development. The 13th day shows the development of the longitudinal folds which project into the lumen (lu). The 19th day shows the formation of the four tunics, the tunica mucosa lined by stratified squamous epithelium (ep), submucosa (sm), tunica muscularis (tm), and tunica adventitia (ta). H and E ×100 (a, b) and ×400 (c). The primordial oesophageal gland (red arrows) appeared in clusters in the tunica mucosa. (d) shows weak reaction of oesophageal glands (red arrow) on 19th day of development. PAS ×100.

(a)

(b)

(c)

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