<prompt> Shape of nulliparous cervical canal is :CircularTransverseSphericalLongitudinal  <response>: Transverse Ref: BDC 4e, Vol 2, p 359; Grays Anatomy 38e, p 1871; Jeffcoates Gynaecology 6e, p 31 Dont get confused with the answer . Question is about cervical canal not the external os. The external os is circular in a nulliparous woman transverse or slit like in parous women. In a nulliparous women, the cervical canal is spindle shaped or fusiform longitudinally, flattened transversely and broadest at mid level. The canal has an anterior a posterior wall. These walls have mucosal folds resembling branches of a tree so are known as arbor vitae uteri. These folds are lost after child bih giving a conical shape to the cervical canal. So, Nulliparous External os Circular Cervical canal Fusiform longitudinally transverse horizontally Multiparous Transverseslit like Conical 