What are the main components of the nose that develop during embryology?

The nose develops into two main components: the external nose (the visible structure on the face) and the nasal cavities (internal structures for respiration and olfaction).

How is the external nose formed during development?

The external nose forms from the fusion of five facial processes: the frontonasal process (bridge), two medial nasal processes (dorsum and tip), and two lateral nasal processes (sides and alae).

What is the origin of the nasal cavities in embryology?

The nasal cavities originate from nasal pits, which are invaginations of ectoderm in the frontonasal process. These deepen into nasal sacs and extend to form primitive nasal cavities.

What are the key steps in the development of the nasal cavities?

Key steps include nasal pits deepening into nasal sacs around the 6th week, rupture of the oronasal membrane to form primitive choanae, and formation of nasal conchae and olfactory epithelium from the cavity walls.

How do the paranasal sinuses develop?

Paranasal sinuses develop as epithelial diverticulae from the nasal cavity walls, growing into surrounding bones like the maxilla and frontal bone. They retain openings into the nasal cavity and are lined with nasal ectoderm.

What are the different types of paranasal sinuses and where do they form?

The four main types are maxillary sinuses in the maxilla, frontal sinuses in the frontal bone, ethmoidal sinuses in the ethmoid bone, and sphenoidal sinuses in the sphenoid bone.

What is the role of the olfactory epithelium in nasal development?

The olfactory epithelium forms from specialized ectoderm in the roof of the nasal cavity. It is the source of olfactory nerves, enabling the sense of smell.

Nose Development – Nasal Pits & Sinuses

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