 The wall of the canal presents an anterior and a posterior longitudinal ridge, from each of which proceed a number of small oblique columns, the "palmate folds", giving the appearance of branches from the stem of a tree; to this arrangement the name "arbor vitae uteri" is applied.The folds on the two walls are not exactly opposed, but fit between one another so as to close the cervical canal.The endocervical mucosa is a site from which adenocarcinoma can arise.