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Invaginate (Verb)

Fold inwards; "some organs can invaginate".

Verbs of touching, hitting, tying, digging.

During fetal development, the neural tube can sometimes fail to properly invaginate, leading to severe neurological disorders.
In some cases of abdominal hernias, the peritoneal sac can invaginate through a weak point in the abdominal wall muscle.
Certain types of cells in the body are able to invaginate their plasma membrane to form vesicles.
The optic cup is formed when the neuroectoderm invaginates to create the outer layer of the retina.
If not closed soon after birth, the patent ductus arteriosus may invaginate and become a life-threatening condition.

Sheathe; "The chrysalis is invaginated".

Verbs of touching, hitting, tying, digging.

The membrane began to invaginate and form a pouch around the embryo.
As the insect transformed, its body started to invaginate, eventually becoming a compact, protected chrysalis.
During development, the cell membrane will invaginate to form the synapse between two neurons.
The bud invaginated, gradually closing around the germ to form a tubular sheath.
In the process of formation, the blastula invaginates and a gastrula is created with distinct cell layers.