Myrtiformis is often omitted from classic anatomy tomes. Some texts describe this muscle as two separate components, the medial fibers forming the depressor septi nasalis muscle, and the lateral fibers forming depressor alae nasi .
- origin: maxilla
- insertion: floor of the nostril
- innervation: facial nerve (VII)
- action: depresses and flares the nostril
- arises from the myrtiform fossa of the maxilla, superior to the lateral incisor and canine, and ascends to its insertion site
- anterior labial fibers: insert into the upper lip
- posterior nasal fibers: insert into the nostril floor, specifically the nostril sill and base of the columella
- buccal nerve (branch of facial nerve (VII))
- depresses and flares the nostril
Muscles of the nose vary in size between individuals and may be entirely absent .
History and etymology
Myrtiformis is derived from the Latin for 'shaped like myrtle berries' .