Frontonasal process

Frontonasal process is a structure that develops in the embryonic stage of mammals, including humans. It is a part of the facial development process and plays a crucial role in the formation of the nose and the upper jaw. The frontonasal process is formed from the ectoderm, one of the three primary germ layers in the very early embryo.

Etymology

The term "frontonasal" is derived from the Latin words "frons" meaning forehead and "nasus" meaning nose. The term "process" in this context refers to a projection or outgrowth.

Development

The frontonasal process develops in the embryonic stage. It is formed from the ectoderm, which is one of the three primary germ layers in the very early embryo. The ectoderm gives rise to the neural tube, the neural crest, and the epidermis.

The frontonasal process is responsible for the formation of the nose and the upper jaw. It is divided into two nasal processes: the medial nasal process and the lateral nasal process. The medial nasal processes fuse to form the intermaxillary segment, which gives rise to the philtrum of the upper lip, the primary palate, and the nasal septum. The lateral nasal processes form the ala of the nose.

Related terms

• Medial nasal process: This is one of the two nasal processes that the frontonasal process is divided into. It fuses to form the intermaxillary segment.
• Lateral nasal process: This is the other nasal process that the frontonasal process is divided into. It forms the ala of the nose.
• Intermaxillary segment: This is formed by the fusion of the medial nasal processes. It gives rise to the philtrum of the upper lip, the primary palate, and the nasal septum.
• Ala of the nose: This is formed by the lateral nasal processes.

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  Gray's Anatomy Plate 44
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  Gray's Anatomy Plate 45