Term Name:	nipple sheath formation
Synonyms:
Definition:	The developmental process pertaining to the initial formation of the nipple sheath from the unspecified epidermis. This process begins with a circular ingrowth of the epidermis around the region of the mammary sprout. It ends before the region begins to elevate.
Ontology:	GO: Biological Process [GO:0060659]    QuickGO    AmiGO