Nasalis 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. Some people can use it to close the nostrils to prevent entry of water when underwater. It can be used to test the facial nerve (VII), which supplies it.

Nasalis muscle
Nasalis.png
Muscles of the head, face, and neck. (Nasalis labeled at center left.)
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

StructureEdit

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 supplyEdit

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

FunctionEdit

The nasalis muscle compresses the nasal cartilages. It may also "flare" the nostrils.[2] Some people can use it to close the nostrils to prevent entry of water when underwater.

Clinical significanceEdit

Cleft lip and cleft palateEdit

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 testingEdit

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 imagesEdit

ReferencesEdit

  1. ^ Menick, Frederick J. (2008). "CHAPTER 4 - Small Superficial Defects — Secondary Intention Healing, Primary Repair, a Skin Graft or Local Flap". Nasal Reconstruction: Art and Practice. Edinburgh: Saunders. pp. 65–90. doi:10.1016/B978-0-7020-3008-6.50010-7. ISBN 978-0-7020-4279-9. OCLC 460904328.
  2. ^ a b c d Attia, Sarah A.; Helal, Hesham A.; El Barabary, Amir S.; Awad, Mostafa A.; Sherif, Mahmoud M. (2019-02-01). "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. ISSN 1010-5182 – via ScienceDirect.
  3. ^ "Nasalis". www.anatomynext.com. Retrieved 2018-03-01.
  4. ^ a b Sanders, Donald B. (2012). "17 - Electrophysiologic Study of Disorders of Neuromuscular Transmission". Aminoff's Electrodiagnosis in Clinical Neurology (6th ed.). Edinburgh: Saunders. 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). "67 - Techniques for Cleft Lip Repair". Maxillofacial Surgery (3rd ed.). St. Louis: Churchill Livingstone. pp. 948–971. doi:10.1016/B978-0-7020-6056-4.00067-8. ISBN 978-0-7020-6059-5. OCLC 968339962.
  6. ^ a b Preston, David C.; Shapiro, Barbara E. (2013). "25 - Facial and Trigeminal Neuropathy". Electromyography and neuromuscular disorders : clinical-electrophysiological correlations (3rd ed.). London: Saunders. pp. 372–383. doi:10.1016/B978-1-4557-2672-1.00025-8. ISBN 978-1-4557-4473-2. OCLC 821857515.

External linksEdit