NBDE Quiz # 64
NBDE Quiz for practice
A cleft lip is a physical split or separation of the two sides of the upper lip and appears as a narrow opening or gap in the skin of the upper lip. This separation often extends beyond the base of the nose and includes the bones of the upper jaw and/or upper gum.
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NBDE Quiz # 64
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1. Question
A right unilateral cleft lip is most likely to result from incomplete union between which of the following prominences?
CorrectThe correct response is E. Five facial prominences border the developing mouth. These include the bilateral mandibular prominences, the bilateral maxillary prominences, and the frontonasal prominence. The lateral nasal and medial nasal prominences are derived from the frontonasal prominence. A unilateral cleft lip results from incomplete union between the medial nasal prominence and the maxillary prominence on the affected side. The lateral and medial nasal prominences are derived from the frontonasal prominence. Clefting would not result from incomplete union of these structures. The lateral nasal prominence unites with the maxillary prominence. A patient with a unilateral cleft lip will have continuity between the lateral alar base and the lateral segment of the upper lip. The lateral nasal prominence does not normally unite with the medial nasal prominence. A lack of union between the lateral and medial nasal prominences will not result in a cleft lip.
IncorrectThe correct response is E. Five facial prominences border the developing mouth. These include the bilateral mandibular prominences, the bilateral maxillary prominences, and the frontonasal prominence. The lateral nasal and medial nasal prominences are derived from the frontonasal prominence. A unilateral cleft lip results from incomplete union between the medial nasal prominence and the maxillary prominence on the affected side. The lateral and medial nasal prominences are derived from the frontonasal prominence. Clefting would not result from incomplete union of these structures. The lateral nasal prominence unites with the maxillary prominence. A patient with a unilateral cleft lip will have continuity between the lateral alar base and the lateral segment of the upper lip. The lateral nasal prominence does not normally unite with the medial nasal prominence. A lack of union between the lateral and medial nasal prominences will not result in a cleft lip.