In an orb-web-weaving spider, you can find seven types of silk glands, and what I have depicted here in this picture, let's start at the one o'clock position, there's tubuliform silk glands, which are used to make the outer silk of an egg sac.
クモの巣を作るクモには ７種類の糸の分泌腺があり 画面に図解しました 右上1時の方向からお話しします 管状腺という絹糸腺があり