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Depressor septi nasi

The depressor septi nasi (Latin: musculus depressor septi nasi) is a facial muscle located in the lower nose region below the nostrils. It is classified as the nasal facial muscle. The depressor septi nasi may be absent or rudimentary.

Depressor septi nasi
OriginIncisive fossa of maxilla
InsertionNasal septum, posterior aspect of alar part of nasalis
ActionDepresses nasal septum, pulls ala of nose downward, constricts aperture of nostril
Innervation Buccal branch of facial nerve
Blood supplySuperior labial artery of facial artery

 

Origin

The depressor septi nasi muscle originates from the incisive fossa of the maxilla.

Depressor septi nasi, Nasal muscles, Facial muscles, Muscles of facial expression, Head muscles
Depressor septi nasi by Anatomy.app

 

Insertion

The depressor septi nasi inserts into the nasal septum and posterior aspect of the alar part of the nasalis muscle.

Nasal dilator muscles with origin and insertion
Nasal dilator muscles by Anatomy.app

 

Action

Upon contraction, the depressor septi nasi depresses the nasal septum and pulls the wing of the nose downward, constricting the aperture of the nostril. It works similarly as the alar part of the nasalis muscle.

Nasal dilator muscles function, Action of nasal dilator muscles, Action of depressor septi nasi
Action of nasal dilator muscles by Anatomy.app
Action of nasal dilator muscles, Function of nasal dilator muscles, Action of depressor septi nasi
Action of nasal dilator muscles by Anatomy.app

 

Innervation

The depressor septi nasi muscle receives nerve supply from the buccal branch of the facial nerve (CN VII).

 

Blood supply

The depressor septi nasi is supplied by the superior labial branch of the facial artery.

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