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UKCD Dev of Face

learning objectives for development of the face

QuestionAnswer
List the 5 primordia that the face will develop from. Paired mandibular prominences; paired maxillary prominences and a single frontonasal prominence.
How is the upper lip formed? Merging of the maxillary prominences with the medial nasal prominences
What do the lateral nasal prominences form? The alae or sides of the nose.
Merging of the medial nasal prominences forms? An intermaxillary segment
List the 3 parts of the intermaxillary segment Labial component (forming the philtrum of the upper lip); maxillary component (associated with the 4 upper incisor teeth); and a palatal component (the primary palate)
What do the mandibular prominences form? Fuse medially to form the lower lip, chin and mandible
The nasal cavity forms from extodermal thickenings referred to at? Nasal placodes
The nasal cavity forms by this phenomenon The nasal placodes recede into nasal pits which further deepen into deep nasal sacs
What structure separates the nasal and oral cavities posteriorly? Oronasal membrane
The palate is composed of two parts what are they? What does each part arise from? Anterior part – median palatine process; posterior part – lateral palatine processes
What forms the primary palate; the secondary palate? The primary palate arise from the median palatine process while the secondary palate develops from the 2 lateral palatine processes
What does the incisive foramen represent? The division between the two parts of the palate – primary and secondary.
List the two parts of the formed tongue Anterior 2/3 (oral part) and posterior 1/3 (pharyngeal part)
What does the anterior 2/3rd arise from? Two lateral lingual swellings (distal tongue buds) and the median tongue bud (tuberculum impar).
What separates the two halves of the anterior 2/3rds? And the anterior 2/3 from the posterior 1/3? Median sulcus, terminal sulcus
From what 2 structures does the posterior 1/3 of the tongue develop? The copula and the hypobranchial eminence
From where does the hypobranchial eminence arise? The 2nd, 3rd and 4th pharyngeal arches
What does the foramen cecum represent? The opening of the thyroglossal duct – the site of the invagination of the thyroid gland from the tongue surface.
Created by: wiechartm