An abnormal communication between the [[Nasal cavity - Anatomy & Physiology| nasal]] and [[Oral Cavity - Oropharynx - Anatomy & Physiology| oral]] cavities involving the [[Soft Palate - Anatomy & Physiology| soft palate]] , [[Hard Palate - Anatomy & Physiology| hard palate]], premaxilla and or [[Lips - Anatomy & Physiology|lip]] . Abnormalities arise during foetal development where there is incomplete closure of the primary palate, secondary palate or both. | An abnormal communication between the [[Nasal cavity - Anatomy & Physiology| nasal]] and [[Oral Cavity - Oropharynx - Anatomy & Physiology| oral]] cavities involving the [[Soft Palate - Anatomy & Physiology| soft palate]] , [[Hard Palate - Anatomy & Physiology| hard palate]], premaxilla and or [[Lips - Anatomy & Physiology|lip]] . Abnormalities arise during foetal development where there is incomplete closure of the primary palate, secondary palate or both. |