Inferior Bundle (Fourth Band) of the Buccinator and the Incisivus Labii Inferioris Muscle

Hu, Kyung Seok; Kwak, Hyun Ho; Lee, Kyu Seok; Kim, Hee Jin

doi:10.1097/scs.0b013e3181f7df35

Cited by 22 publications

(15 citation statements)

References 6 publications

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“…Our literature review revealed that some authors believed the ILS to be the bony heads or accessory bundle of the OO [ 7 , 9 , 14 ]. We agree, because all the fibers of the i-ILS join the OO, and regarding the lower lip, the incisivus labii inferioris is an accessory muscle of the OO complex [ 21 - 22 ]. No literature has mentioned the common bony attachment of the nasalis and i-ILS, but Burkitt and Lightoller [ 5 ] presented a similar illustration, a triangular bony attachment, but each attachment was separate in their study.…”

Section: Discussionmentioning

confidence: 82%

Anatomical Study and Comprehensive Review of the Incisivus Labii Superioris Muscle: Application to Lip and Cosmetic Surgery

Iwanaga

Watanabe

et al. 2017

Cureus

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ObjectivesThe incisivus labii superioris muscle, which originates from the floor of the incisive fossa of the maxilla, has previously been described, it is not well understood. The purpose of this study was to investigate the incisivus labii superioris muscle with detailed dissection.MethodsTwenty-six halves from thirteen fresh frozen cadaveric Caucasian heads were used in this study. First, the incisivus labii superioris muscle was dissected to reveal its origin and insertion, and its relationship to other mimetic muscles. Secondly, the distance from the midline to the innermost part of the bony attachment of the muscle was measured. The literature describing the incisivus labii superioris muscle was reviewed.ResultsThe incisivus labii superioris muscle consisted of two parts, inferior and superior. The former merged into the orbicularis oris and the latter into the nasalis. The mean distance from the midline to the innermost part of the bony attachment of the incisivus labii superioris muscle was 4.8 ± 1.7 mm on the right side and 4.9 ±1.7 mm on the left.ConclusionsThe results of the present study suggest that the inferior part of the incisivus labii superioris should be considered as an accessory muscle of the orbicularis oris complex, and the superior part is the nasalis muscle.

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Section: Discussionmentioning

confidence: 82%

Anatomical Study and Comprehensive Review of the Incisivus Labii Superioris Muscle: Application to Lip and Cosmetic Surgery

Iwanaga

Watanabe

et al. 2017

Cureus

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“…The ILS has a more complicated course than the ILI. The ILS courses along the convex superior peripheral part of the OOr, blending with several muscles in the modiolar area, while the ILI courses laterally and upward along the lower mucolabial fold and blends with the OOr or buccinator below the level of the corner of the mouth 5 , 11 , 12 . The present study has clearly demonstrated several anatomical features of the ILS (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Burkitt and Lightoller (1926) 10 described that the ILS is well developed and that its fibers are of the same size and pigmentation as in the OOr in Aboriginal Australians. There have been several reports about the morphology of the ILI and its anatomical relationships with surrounding structures in humans 11 , 12 . However, there have been few reports about the anatomy of the ILS 13 .…”

Section: Introductionmentioning

confidence: 99%

Anatomical features of the incisivus labii superioris muscle and its relationships with the upper mucolabial fold, labial glands, and modiolar area

Hur

2018

Sci Rep

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The current study examined the incisivus labii superioris muscle (ILS) and its morphologic and spatial relationships with the surrounding structures, especially focusing on the upper mucolabial fold, labial glands, and modiolar area. ILSs were investigated in 52 specimens obtained from formalin-fixed Korean adult cadavers (26 left sides, 26 right sides of the face; 15 men, 11 women; mean age, 70.8 years). ILSs were observed in all specimens (100%). The ILS has an oblique and linear origin from the incisive fossa of the maxilla to the point just medial to the origin of the levator anguli oris muscle (LAO). The arising fibers of the ILS arched and covered the prominent labial glands at the superior margin of the orbicularis oris muscle (OOr). After the ILS coursed laterally along the anterior part of the upper mucolabial fold, it divided into superficial and deep inserting fibers in 48 specimens (92.3%) and it did not divide in 4 specimens (7.7%). The superficial inserting ILS fibers and the ILS fibers that did not divide blended with the medial fibers of the LAO to converge toward the modiolus. The deep inserting fibers of the ILS blended with the lateral deep fibers of the OOr in the 48 specimens (92.3%), and the deep inserting fibers continued to descend to converge toward the modiolus in 20 of those specimens (38.5%). These observations indicate that the ILS may assist to compress the labial glands and the upper oral vestibule, controlling modiolar movements and thereby integrating the movements of the mouth and lips.

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“…However, we need to understand all the related mimetic muscles three dimensionally prior to discussing this space, because most of those mimetic muscles related to the oral cavity have been described via dissection from outside the face and not from an intraoral perspective. Also, most of the studies of the mimetic muscles used embalmed cadavers where it is difficult to retract the muscles and other soft tissues [ 2 , 3 ].…”

Section: Discussionmentioning

confidence: 99%

“…Also, the bony attachment of the BM corresponds to the mucogingival junction [ 5 ]. According to textbook descriptions [ 6 ] and anatomical studies of the ILI [ 2 , 3 , 5 ], the ILI origins at the same level as the mucogingival junction of the mandible pass from the alveolar border of the mandible between the central incisor medially and canine laterally and toward the angle of the mouth or inferior part of the orbicularis oris muscle obliquely. These two muscles, the BM and ILI, thus form the entrance into the bucco-mandibular space.…”

Section: Discussionmentioning

confidence: 99%

Hematoma in the Bucco-Mandibular Space: First Case Report

Iwanaga

Wilson

Yılmaz

et al. 2017

Cureus

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Our previous studies based on intraoral dissection of fresh cadavers revealed that the fissure and loose connective tissues deep to the mucosa between the incisivus labii inferioris muscle and buccinator muscle form the entrance of the newly discovered bucco-mandibular space. To support the clinical significance of this space, we report the finding of a hematoma within this space in an adult fresh cadaver. Such a finding lends credence to studying the bucco-mandibular space and might help better understand the spread of some infections in the oral region.

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Inferior Bundle (Fourth Band) of the Buccinator and the Incisivus Labii Inferioris Muscle

Cited by 22 publications

References 6 publications

Anatomical Study and Comprehensive Review of the Incisivus Labii Superioris Muscle: Application to Lip and Cosmetic Surgery

Anatomical Study and Comprehensive Review of the Incisivus Labii Superioris Muscle: Application to Lip and Cosmetic Surgery

Anatomical features of the incisivus labii superioris muscle and its relationships with the upper mucolabial fold, labial glands, and modiolar area

Hematoma in the Bucco-Mandibular Space: First Case Report

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