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UKCD Dev of Face
learning objectives for development of the face
| Question | Answer |
|---|---|
| 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
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