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

Figure 3

Sections of the primordial oesophagus on the 24th (a) and 27th (b) days of development; the 24th day of development shows primordial oesophageal glands (red arrow) with single and stratified layers and also thick tunica muscularis (tm); on the 27th day, primordial oesophageal glands showed single layer of cuboidal cells, lamina propria (lp) clearly separated from lamina muscularis (lm), submucosa (sm), blood vessel (black arrow), inner circular muscle (tmc), and outer longitudinal muscle (tml). (c) and (d) show histochemical characteristics of primordial oesophagus on 24th and 27th days of development, respectively; 24th day shows weak reaction of oesophageal glands (red arrows) while 27th day shows positive oesophageal glands reaction. PAS ×100 (c), ×40 (d).

(a)

(b)

(c)

(d)