C: ala of the nose- The alae are the rounded, lateral flared portions of the external nose that form the lateral walls of the nostrils. Composed mainly of fibrofatty tissue and cartilage, they are flexible to allow expansion during inspiration and play a role in directing airflow into the nasal passages for optimal filtration and humidification. D: Rhinal apex - The rhinal apex, or tip of the nose, is the most anterior and mobile part of the external nose. It is primarily cartilaginous, allowing slight movement, and contributes to the overall nasal contour and the first point of air entry, influencing airflow direction. E: nostril- The nostrils are the external openings of the nasal cavity, bordered by the alae and the nasal septum. While closely related to the ala, the nostril refers specifically to the opening itself, not the flared wing. B: Dorsum nasi- The dorsum nasi is the longitudinal ridge that extends from the root to the tip of the nose. It consists of both bony (upper two-thirds) and cartilaginous (lower one-third) structures, providing the nose with its shape and contributing to the regulation of airflow by maintaining airway patency. A: Root- The root of the nose is the superior, bony attachment of the nose located between the eyes at the nasofrontal suture. It connects the nasal bones to the forehead and provides structural support to the nasal bridge, serving as the anchor for the upper portion of the nose