Palate - Palate

Japanese: 口蓋 - こうがい

In vertebrates, the upper wall of the oral cavity forms the boundary between the oral cavity and the nasal cavity. In fish, the oral cavity and nasal cavity are not connected, but in amphibians and above, they are connected by the internal nares. The wide area at the front is called the hard palate because it is based on bones, while the narrow area at the back is called the soft palate because it has no bones and has many striated muscles. Both are covered with a mucous membrane with many mucous glands. The rear part of the soft palate is called the velum, which moves a lot, and its central part is called the uvula. When swallowing food, the velum is pulled up to block the food from entering the nasal cavity. Two arch-shaped mucous membranes called the palatine arches hang down from both sides of the palate, and the lower end is depressed between the folds to contain the palatine tonsils.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

脊椎動物において口腔の上壁で鼻腔との境をつくる部分。魚類では口腔と鼻腔がつながらないが，両生類以上では内鼻孔でつながる。前方の広い範囲は骨がその基礎をつくるので，硬口蓋と呼ばれ，後方の狭い範囲は内に骨がなく横紋筋を多くもつので軟口蓋と呼ばれ，いずれも多数の粘液腺をもった粘膜でおおわれる。軟口蓋の後部は口蓋帆といってよく動き，その中央部は口蓋垂と呼ばれる。口蓋帆は食物の嚥下(えんげ)に際し引き上げられて，食物が鼻腔に入らないようにふさぐ。口蓋の両側から口蓋弓と呼ぶ２本の弓状の粘膜が下方に下がり，ひだの間で下端はくぼんで口蓋扁桃(へんとう)をいれる。
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