Dilator naris muscle

Dilator naris muscle is a muscle of the nose that is involved in the process of respiration. It is divided into two parts: the anterior and posterior dilator naris. The anterior dilator naris is a part of the nasalis muscle and is found in the nasal ala, while the posterior dilator naris is not always present.

Etymology

The term "dilator naris" is derived from Latin, with "dilator" meaning "expander" and "naris" referring to the nostril.

Function

The primary function of the dilator naris muscle is to open the nostrils, thereby facilitating respiration. The anterior part of the muscle helps in widening the nostrils when it contracts, while the posterior part, when present, assists in narrowing the nostrils.

Clinical significance

Abnormalities or damage to the dilator naris muscle can lead to difficulties in respiration. It may also be involved in certain conditions such as sleep apnea, where the inability to properly open the nostrils can contribute to the cessation of breathing during sleep.

Related terms

• Nasalis muscle: The muscle in which the anterior dilator naris is found.
• Nasal ala: The wing of the nose, where the anterior dilator naris is located.
• Respiration (physiology): The process in which the dilator naris muscle plays a role.

See also

• List of muscles of the human body

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