neusvleugels

Neusvleugels are the two external flaps on the sides of the nose that bound the nostrils. They are formed by skin and underlying cartilage, and together they define the openings of the nasal cavities, known as nares. Each nostril is bounded laterally by one neusvleugel, and the pair of neusvleugels work with the nasal septum to shape the nasal aperture.

Anatomically, the neusvleugels are part of the lateral nasal walls and are supported by alar cartilages. The skin over the neusvleugels contains hair follicles and sebaceous glands, and they are continuous with the skin of the nasal tip and cheeks. Behind the external openings lies the nasal vestibule, lined with keratinized epithelium and contributing to the initial filtration of inhaled air.

Functionally, the neusvleugels help regulate airflow into the nasal cavity. They support the nostrils and, with accompanying facial muscles, can dilate or constrict the openings during breathing, facial expressions, or exertion. They also contribute to the warming and humidifying of inspired air by guiding airflow through the nasal passages.

Variation is common: the size, shape, and prominence of the neusvleugels differ among individuals and can be influenced by aging, genetics, or previous injury. Congenital deformities or traumatic damage can alter their appearance or function.

Clinical relevance includes considerations in nasal trauma, cosmetic rhinoplasty, and reconstructive procedures. Procedures aiming to adjust the size or shape of the alae nasi (alar base or alar rim) are performed to correct nostril asymmetry or improve nasal airflow, while preserving function.