Table 1.

Anatomy of the cleft lip.

	Normal	Unilateral CL	Bilateral CL
Skin	Intact across lip	Deficient across full (complete) or partial (incomplete) vertical height of upper lip	Deficient across full (complete) or partial (incomplete) vertical height of upper lip
Muscle (orbicularis oris)	Intact across lip	Usually deficient and/or disoriented across cleft	Usually deficient and/or disoriented across cleft
	Circumferentially orientated	Inserts along cleft or nasal base	Absent in prolabium
Lip	Cupid’s bow and philtrum present and symmetrical	Cupid’s bow is less conspicuous and upwardly rotated toward the cleft side. Philtral column is shorter on the cleft side	Bilateral loss of Cupid’s bow and philtral structures
Bone (premaxilla)	Intact	Depending on the involvement of alveolus, it may range from intact to a wide alveolar cleft	May be significantly protruded
Nose	Normal/symmetric nasal tip Normal/symmetric columella Normal/symmetric nasal base Nostril oriented vertically Normal caudal septum	Nasal tip flat and deflected to non-cleft side Short columella on cleft side Lateral crus of alar cartilage is displaced laterally, posteriorly, and inferiorly on cleft side Nostril oriented horizontally on cleft side Caudal septum is displaced to non-cleft side	Nasal tip flat and broad in bilateral complete cases only otherwise it Short columella Bilateral lateral crura of alar cartilages are displaced laterally, posteriorly, and inferiorly Nostril is oriented horizontally on both sides