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Levator labii superioris

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Last Updated: 05 September 2020

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General | Latest Info

Levator labii superioris

Details
ActionsElevates the upper lip
Arteryfacial artery
InsertionSkin and muscle of the upper lip ( labii superioris )
Nervebuccal branch of the facial nerve (C.N. VII)
OriginMedial infra-orbital margin
Identifiers
FMA46805
Latinmusculus levator labii superioris
TA22081
TA98A04.1.03.031

Levator labii superioris muscle that is used when people make facial expressions. It is shaped like a broad, flat sheet that starts next to the nose and extends to zygomatic bone, which is more commonly referred to as cheekbone. This muscle arises from the top portion of upper jaw frontal process and passes in a downward direction, dividing into two lateral slips. One of them slipped into the skin and cartilage of my nose. Other slip blends into orbicularis oris and infraorbital head after extending into the top of the lip. In addition to making general facial expressions, levator labii superioris muscle that is primarily responsible for elevating the upper lip.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Levator labii superioris muscle

Key facts about the levator labii superioris muscle

OriginZygomatic process of maxilla, maxillary process of zygomatic bone
InsertionBlends with muscles of upper lip
ActionElevates upper lip, exposes maxillary teeth
InnervationZygomatic and buccal branches of facial nerve (CN VII)
Blood supplyFacial artery, infraorbital branch of maxillary artery

As noted above, levator labii superioris muscle is divided into three parts: medial, central, and lateral portions of muscle. To recap, medial portion is also called levator labii superioris alaeque nasi muscle. Levator labii superioris alaeque nasi can be further subdivided into furrow portion, alar portion, and lip portion. Three parts lie on top of the nasalis muscle. Origin of levator labii superioris alaeque nasi is superior anterior process of maxilla and inserted into region to side of nostril and upper lip. The main action of all three parts is to elevate the upper end of the nasolabial furrow, posterior end of nasal wing, and middle portion of each side of the upper lip. The central / intermediate portion arises from the lower margin of orbit directly above infraorbital foramen. Attachment is mostly to maxilla, with a few other fibers attached to zygomatic bone. Fibers ultimately converge and insert into the muscular area of the upper lip between the angular head and levator anguli oris. The lateral portion, which forms the zygomatic head, arises from the malar surface of zygomatic bone directly behind zygomaticomaxillary suture and heads downward and medial in the direction of the upper lip.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Origin

Key facts about the levator labii superioris muscle

OriginZygomatic process of maxilla, maxillary process of zygomatic bone
InsertionBlends with muscles of upper lip
ActionElevates upper lip, exposes maxillary teeth
InnervationZygomatic and buccal branches of facial nerve (CN VII)
Blood supplyFacial artery, infraorbital branch of maxillary artery

Levator Labii Superioris muscle that has three points of origin that blend and pass into the upper lip. Angular head levator Labii Superioris alaeque nasi arise via the frontal process of maxilla. The infraorbital head arises via the inferior orbital margin, it is the largest part. Zygomatic head zygomaticus minor arises via the facial portion of zygomatic bone. All three origins attach together within the upper lip and at time of contraction, raise the upper lip. Strap of angular head attaches within ala of nose and assists in dilation of nostril.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Action

Levator labii superioris muscle is a three - part muscle useful for facial expression and dilation of the mouth. It runs down alongside the lateral aspect of the nose. Its primary function is in raising upper lip. It is also involved in movements such as facial expressions, actions of disgust, expressions of sadness, nasal flaring, retching, disdain, and even to show oral content. Its general origin is on lateral aspect of the nose and extends to zygomatic bone. Levator labii superioris receives its blood supply from the facial artery and infraorbital branch of maxillary artery. Buccal branch of facial nerve or cranial nerve VII innervate levator labii superioris.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Summary

In order to facilitate and improve muscle repair in wide cleft lips, levator labii superioris muscle flap has been used to augment orbicularis oris muscle. The neurovascular pedicle of this muscle flap can be preserved to eliminate the possibility of ischemic muscle fibrosis and atrophy. Eleven patients between the ages of 4 months and 24 years having wide cleft lips underwent this procedure. Seven had unilateral and 4 had bilateral cleft lip deformity. In one patient who had bilateral complete cleft lip, levator labii superioris muscle was directly approximated to contralateral muscle. In the other three patients with bilateral cleft lips, levator labii superioris muscle flaps approximated to contralateral orbicularis oris muscles. In all 7 unilateral cases, levator labii superioris muscle flaps were used to obtain tension free closure and for filling out defect below nostril sill. None of the patients had wind infection, wound dehiscence or scar widening. Functional loss resulting from transposition of flap is compensated for by remaining synergistic muscle, zygomaticus minor. This method of muscle repair seems to be completely benign, and muscle flap dissection can be performed easily and safely.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Sources

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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