The nasal base is composed of the columella and the alae.
The alae (right ala and left ala) are supported by cartilage - the alar cartilages.
Each alar cartilage is composed of a medial crus or foot and a lateral crus. The medial crus from each side join to form the skeletal support of the colmella. The lateral crus of the alar cartilage is the skeleton of the ala.
The nasal septum is the partition seperating the right and left nasal airways. It is composed of bone posterior and cartilage in front where it helps to support the nasal tip.