There is usually flexible tissue called cartilage between them, as well as a type of fluid. (darwinspet.com)
~ Olive oil, sweet almond oil, lanolin, or comfrey ointment rubbed into the nipples throughout the latter part of the pregnancy and the beginning weeks of nursing create healthy, flexible tissues very resistant to cracks, tears, and chapping. (motherandchildhealth.com)
He likens these networks of flexible tissues and structures to the Eiffel Tower — if said tower could grow, stretch and rip itself apart over time. (scientificamerican.com)