A fissure in the upper lip that is due to failure of the left and right sides of the fetal lip tissue to fuse, an event that should take place by 35 days of fetal age. Cleft lip can be on one side only or on both sides. Because failure of lip fusion can impair the subsequent closure of the palatal shelves, cleft lip often occurs in association with cleft palate. It is one of the most common physical birth defects, and it can be corrected with surgery.
- Clay-shoveler's fracture
Clay-shoveler’s fracture: An uncommon breakage of the spine of the vertebrae from the lower neck or upper back as a result of stress. Clay-shoveler’s fracture usually occurs in laborers who perform activities involving lifting weights rapidly with the arms extended. Examples of these activities include shoveling soil, rubble or snow up and over the head […]
- Cleft palate
An opening in the roof of the mouth due to a failure of the palatal shelves to come fully together from either side of the mouth and fuse during the first months of development as an embryo. The opening in the palate permits communication between the nasal passages and the mouth. Surgery is needed to […]
- Cleft palate prosthesis
Cleft palate prosthesis: A prosthetic device designed to close the opening left by a cleft (opening) in the palate and thereby to improve feeding and speech.
- Cleft uvula
Cleft uvula: A common minor anomaly in which the uvula (the tissue that hangs down at the back of the palate) is cleft, or parted by a fissure. Persons with a cleft uvula should not have their adenoids removed because without the adenoids they cannot achieve proper closure between the soft palate and pharynx while […]
- Cleidocranial dysostosis
Cleidocranial dysostosis: A genetic disorder of bone development that is characterized by absent or incompletely formed collarbones and cranial and facial abnormalities that may include square skull, late closure of the sutures of the skull, late closure of the fontanels, low nasal bridge, delayed eruption of the teeth, and abnormal permanent teeth. A child with […]