BGDB Face and Ear - Late Embryo
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Week 6
Primary Palate
- Beginning week 6 there is fusion of the upper lip.
- Formed by the maxillary prominences of of the first pharyngeal arch and the frontonasal prominence.
- Failure of this embryonic process leads to cleft lip.
Week 6 (stage 16)
Week 6 (stage 17)
Week 7 (stage 18)
Week 7 (stage 19)
Above images show face development through week 6 to week 7 (1mm scale markings).
The animation shows the early fusion of the primary palate in the human embryo between stage 17 and 18, going from an epithelial seam to the mesenchymal bridge.
Face Development Movie | MP4 movie|
This animation shows a ventral view of development of the human face from approximately week 5 through to neonate.
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Week 8
- Oral Cavity (stage 23)
Floor
Floor (labeled)
Roof
Roof (labeled)
Selected Head Images: B4 - Choroid Plexus | B5 - Cochlea | B6 - Cochlea
Palate
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The dark "pear-shaped" central structure at the top is the developing tongue. The two pale regions either side are the palatal shelves, note that they have not yet fused in the midline (failure of this process is cleft palate). |
Hearing
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Behind that a pale cartilagenous region (that later ossifies) encloses the structuctures of the inner ear, beside which middle ear bones are forming. On the righthand side of the head the external ear is visible. The lower half of the image shows the developing brainstem with a large ventricular space occupied in part by an extensive choroid plexus (manufacturer of cerebrospinal fluid). |
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Embryonic development of the human membranous labyrinth. |
Membranous labyrinth and acoustic complex model reconstructed from week 8 human embryo (CRL 30 mm). Note that by the end of the embryonic period the adult external structure has been achieved, internal development continues through the fetal period. |
Embryonic External Ear
Shown below are the changes in external ear development between week 5 to week 8. Development changes from a series of 6 hillocks on arch 1 and arch 2 (week 5) to a structure resembling the adult ear (week 8).
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Additional Information
| Additional Information - Content shown under this heading is not part of the material covered in this class. It is provided for those students who would like to know about some concepts or current research in topics related to the current class page. |
Membranous Labrynth
Growth and stages of differentiation of the human membranous labyrinth.
BGDB: Lecture - Gastrointestinal System | Practical - Gastrointestinal System | Lecture - Face and Ear | Practical - Face and Ear | Lecture - Endocrine | Lecture - Sexual Differentiation | Practical - Sexual Differentiation | Tutorial
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Cite this page: Hill, M.A. (2024, April 20) Embryology BGDB Face and Ear - Late Embryo. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDB_Face_and_Ear_-_Late_Embryo
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
