5 Questions
What is the frontonasal process and where is it located?
The frontonasal process is a bulge of tissue in the upper facial area, at the most cephalic end of the embryo, and it is the cranial boundary of the stomodeum.
What do the nasal placodes develop into?
The nasal placodes become submerged, forming depressions that develop into nasal (olfactory) pits, which then develop into nasal cavities.
What is the role of the medial nasal processes in the formation of the nose and upper lip?
The paired medial nasal processes fuse externally to form the middle portion of the nose from the root to the apex, as well as the center portion of the upper lip and the philtrum region.
What structures does the frontonasal process form in the upper face?
The frontonasal process will form the forehead, bridge of the nose, primary palate, nasal septum, and all structures related to the medial nasal processes.
What are the lateral nasal processes and what do they form?
The lateral nasal processes are crescent-shaped swellings on the outer portion of the nasal pits, and they form the alae (sides) of the nose.
Study Notes
Frontonasal Process
- The frontonasal process is a facial progenitor that forms during embryonic development.
- It is located in the front of the embryo's head and gives rise to the nose, upper lip, and surrounding tissues.
Nasal Placodes
- Nasal placodes are thickened areas of ectoderm that develop into the optic cups and nasal pits.
- The nasal placodes develop into the nasal epithelium, olfactory epithelium, and the epithelial lining of the nasal cavity.
Medial Nasal Processes
- The medial nasal processes are two prominent swellings that form from the frontonasal process.
- These processes play a crucial role in the formation of the nose and upper lip by growing medially and merging to form the intermaxillary segment.
- The intermaxillary segment eventually becomes the philtrum of the upper lip and the primary palate.
Frontonasal Process Derivatives
- The frontonasal process forms various structures in the upper face, including the forehead, nose, and upper lip.
- Its derivatives also include the nasal bone, nasal cartilage, and the upper jaw.
Lateral Nasal Processes
- The lateral nasal processes are two smaller prominences that arise from the frontonasal process.
- They form the alae of the nose and the lateral aspects of the nasal cavity.
Test your knowledge of the development of the frontonasal process and the formation of the upper face during the fourth week of embryonic development. Learn about the structures and processes involved in the formation of the forehead, nose bridge, primary palate, nasal septum, and related medial nasal structures.
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