Fig. 1. Scanning electron micrographs showing prenatal filiform papillae (FP) of Korean native goats. (A) Undeveloped primordia of FP appeared in 60-day-old fetus (embryonic day [E] 60). (B) High magnification view on the surface of FP in E60. (C) Developing primordia of FP are seen in 90-day-old fetus. (D) FP shaped like a double flower bud in 120-day-old fetus (E120). (E) High magnification view on the surface of FP in E120. (F) FP have empty inside and irregularly arranged saw blade-like processes in neonates. FUP, fungiform papillae; MP, microplicae. Scale bars = 100 μm (A, B, D and F), 1 μm (B and E).
Fig. 2. Scanning electron micrographs showing postnatal FP from juveniles of Korean native goats. (A) FP have big and long primary papillae with narrow and low secondary papillae in 30-day-old goat. (B) FP of 60-day-old goat and (C) FP of 90-dayold goat showed well-developed secondary papillae. (D) FP of 120-day-old goat and (E) FP of 150-day-old goat had many small peaked papillae processes. (F) FP of 180-day-old goat had completed morphogenesis. Scale bars = 100 μm.
Fig. 3. High magnification view on the surface of postnatal developing FP in Korean native goats. (A) Many MP are developed on the surface of FP in 30-day-old goat. (B) MP are long and straight shaped like thread while microridge (MR) is observed in 60-day-old goat. (C) MP and MR are well-developed in 90-day-old goat. (D) The surface epithelium of FP has straight MP in 180-day-old goat. Scale bars = 1 μm.
Fig. 4. Scanning electron microscopy measurements of the length of FP. Each height and oblique length were measured from postnatal day 0 (P0) to 180-day-old Korean native goats (P180). There were no statistically significant differences in size of FP during the next 30 days (p > 0.05).