Nasalis muscle

Nasalis muscle
The superior transverse part and inferior alar part of the nasalis muscle
Details
OriginMaxilla
InsertionNasal bone
ArterySuperior labial artery
NerveBuccal branch of the facial nerve
ActionsCompresses bridge of nose, depresses tip of nose, elevates corners of nostrils
Identifiers
Latinmusculus nasalis
TA98A04.1.03.009
TA22062
FMA46770
Anatomical terms of muscle

The nasalis muscle is a sphincter-like muscle of the nose. It has a transverse part and an alar part. It compresses the nasal cartilages, and can "flare" the nostrils. It can be used to test the facial nerve (VII), which supplies it.

Structure

The nasalis muscle covers the nasal cartilages of the lower surface of the nose.[1] It consists of two parts, transverse and alar:

  • The transverse part (compressor naris muscle) arises from the maxilla, above and lateral to the incisive fossa. Its fibers proceed upward and medially, expanding into a thin aponeurosis which is continuous on the bridge of the nose with that of the muscle of the opposite side, and with the aponeurosis of the procerus muscle. It compresses the nostrils and may completely close them.[2]
  • The alar part (dilator naris muscle) arises from the maxilla over the lateral incisor and inserts into the greater alar cartilage. Its medial fibres tend to blend with the depressor septi nasi muscle, and has been described as part of that muscle.

Nerve supply

Like all the other muscles of facial expression, the nasalis muscle is supplied by the facial nerve (VII).[3][4]

Function

The nasalis muscle compresses the nasal cartilages. It may also "flare" the nostrils.[2]

Clinical significance

Cleft lip and cleft palate

The nasalis muscle is one of the key muscles not formed or inserted correctly with cleft lip and cleft palate deformity.[5] The head of the transverse part needs to be identified during reconstructive surgery so that it can be surgically sutured (connected to) the nasal septum.[2][5] The origin at the maxilla may also be repositioned for better symmetry.[2]

Facial nerve testing

Due to it being superficial, the nasalis muscle can be used to test the facial nerve.[4][6] Specifically, it can be used to test the zygomatic branches.[6]

Additional images

References

  1. ^ Menick, Frederick J. (2009). "Small Superficial Defects — Secondary Intention Healing, Primary Repair, a Skin Graft or Local Flap". Nasal Reconstruction. pp. 65–90. doi:10.1016/B978-0-7020-3008-6.50010-7. ISBN 978-0-7020-3008-6. OCLC 460904328.
  2. ^ a b c d Attia, Sarah A.; Helal, Hesham A.; El Barabary, Amir S.; Awad, Mostafa A.; Sherif, Mahmoud M. (February 2019). "Impact of nasalis muscle repair in unilateral cleft lip patients". Journal of Cranio-Maxillofacial Surgery. 47 (2): 255–262. doi:10.1016/j.jcms.2018.11.030. PMID 30591393.
  3. ^ "Nasalis". www.anatomynext.com. Retrieved 2018-03-01.
  4. ^ a b Sanders, Donald B. (2012). "Electrophysiologic Study of Disorders of Neuromuscular Transmission". Aminoff's Electrodiagnosis in Clinical Neurology. pp. 385–406. doi:10.1016/B978-1-4557-0308-1.00017-0. ISBN 978-1-4557-0308-1. OCLC 793587054.
  5. ^ a b Drake, David; Colbert, Serryth (2017). "Techniques for Cleft Lip Repair". Maxillofacial Surgery. pp. 948–971. doi:10.1016/B978-0-7020-6056-4.00067-8. ISBN 978-0-7020-6056-4. OCLC 968339962.
  6. ^ a b Preston, David C.; Shapiro, Barbara E. (2013). "Facial and Trigeminal Neuropathy". Electromyography and Neuromuscular Disorders. pp. 372–383. doi:10.1016/B978-1-4557-2672-1.00025-8. ISBN 978-1-4557-2672-1. OCLC 821857515.

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