Major alar cartilage

Major alar cartilage

The major alar cartilage, also known as the greater alar cartilage, is a key structural component of the human nose. It plays a crucial role in shaping the nostrils and supporting the nasal tip. The major alar cartilage is paired, with one cartilage on each side of the nose.

Anatomy

The major alar cartilage is a flexible, curved structure that forms the framework of the nostrils. Each cartilage is divided into three parts:

• The medial crus – This part extends towards the nasal septum and helps in forming the columella, the tissue that separates the nostrils.
• The lateral crus – This part extends laterally and supports the side of the nostril.
• The intermediate crus – This part connects the medial and lateral crura and provides additional support to the nasal tip.

Function

The primary function of the major alar cartilage is to maintain the shape and patency of the nostrils, allowing for proper airflow through the nasal cavity. It also contributes to the overall aesthetic appearance of the nose by defining the nasal tip and nostril shape.

Clinical Significance

Damage or deformity of the major alar cartilage can lead to functional and cosmetic issues. Common conditions affecting this cartilage include:

• Nasal trauma – Injuries to the nose can cause fractures or dislocations of the major alar cartilage.
• Rhinoplasty – Surgical procedures to alter the shape of the nose often involve modification of the major alar cartilage.
• Nasal valve collapse – Weakness or damage to the major alar cartilage can result in the collapse of the nasal valve, leading to breathing difficulties.

Related Structures

The major alar cartilage is closely associated with other nasal structures, including:

• Minor alar cartilage – Smaller cartilages that provide additional support to the nostrils.
• Nasal septum – The partition that separates the two nasal cavities.
• Lateral nasal cartilage – Cartilages that support the sides of the nose.

See Also

• Nasal anatomy
• Rhinoplasty
• Nasal septum