invaginates

The cell membrane invaginates , encloses the fluid or particles , then fuses again , forming a vesicle that later detaches and moves to the cell interior .

细胞膜先内陷关住液体或微粒，然后再次加以融合，形成小泡，小泡随后脱离细胞膜进入细胞内。

The nuclear membrane invaginates and lysosomes are internalized . ( 3 ) determination of solute concentration in various solutions by NTM ;

核膜内陷，于是溶酶体被内在化。（3）各种物质溶液浓度的核孔膜测定；

In the late spermatid , one side of the acrosomal vesicle invaginates to form a PAS negative central canal .

后期精细胞在与头帽相对一端的顶体囊泡中央发生凹陷形成PAS阴性的中央管；

Lamina propria and muscularis mucosae have not yet invaginate in the epithelial lining which forms the fold or villus . Tunica adventitia contains many blood vessels .

可见大量处于分裂期的黏膜上皮细胞，堆积形成很厚的粘膜层，此时固有膜和黏膜肌层尚未凸起进入黏膜上皮形成皱襞或者绒毛，外膜中形成了很多血管。