The mucosa of the cervical canal (endocervix) is composed of a single layer of mucin-secreting columnar epithelium, which lines both the surface and the underlying glandular crypts. Isolated neuroendocrine epithelial cells of argentaffin type or argyrophil type are admixed with the normal endocervical cells.
Air travel Pregnant travellers can normally travel safely by air. In the absence of medical or obstetrical complications, pregnant women can safely fly up to 36 weeks gestation. Most airlines restrict travel in late pregnancy or may require a written confirmation from a physician.
Before you travel. If you're planning on travelling by plane, you should discuss this with your midwife or GP. Before you book your tickets, check with your airline and insurance company that they will allow you to travel while pregnant. After week 28 of the pregnancy, most airlines require a letter from your midwife or GP confirming: 1  that you're in good health. 2  that you have a normal pregnancy. 3  the expected date of delivery.