An anatomic study of the attachments on the condylar process of the mandible: muscle bundles from the temporalis

Abstract

Since dysfunction of the temporomandibular joint is likely closely related to both the lateral pterygoid muscle and also the temporalis, further studies are necessary to evaluate the function of these muscles and consider jaw movement.

Tissue Engineering for the Temporomandibular Joint

“…During mandibular movement, the condyle rotates in the glenoid fossa and then transverses over the articular eminence as the jaw is maximally opened. Also, the condyle provides anchoring points for the articular disc, the capsule, and the lateral pterygoid [126] . The overall size of the condylar head is 690 ± 50 mm 3 with a surface area of 400 ± 60 mm 2 , and in the mediolateral direction, the adult condyle is 19.0 ± 3.0 mm, while in the anteroposterior direction it is 8.7 ± 1.7 mm [127,128] .…”

Masticatory Muscles and Branches of Mandibular Nerve: Positional Relationships Between Various Muscle Bundles and Their Innervating Branches

“…We have investigated the origins and insertions of the masticatory muscles and the adjacent bundles of the main muscles. In addition, we have also examined the positional relationships between the muscle bundles and innervating branches (Shimokawa et al, , ; Akita et al, , , ; Sakamoto and Akita, ; Usui et al, ; Matsunaga et al, ; Sakaguchi‐Kuma et al, ). In this review, we present the results of our observations of various muscle bundles of the masticatory muscles and their innervation patterns.…”

“…( C – F ) Attachments of the anterolateral muscle bundle (AL) and the anteromedial muscle bundle (AM) are visualized by using 3D reconstruction images prepared from the micro CT images (inspeXio SMX‐100ct; Shimadzu, Kyoto, Japan). The borders of the attachments of the muscles are indicated by a radiopaque silicon tube as used in the study of Sakaguchi‐Kuma et al (). AL, anterolateral muscle bundle of the temporalis; AM, anteromedial muscle bundle of the temporalis; Co, condylar process; Cp, coronoid process; LP, lateral pterygoid; MS, masseter; Pf, pterygoid fovea; TP, main part of the temporalis; ZM, zygomaticomandibularis.…”

“…The lateral pterygoid is situated in the infratemporal fossa and just inferolateral to the oval foramen of the temporal bone that the mandibular nerve passes through. As the lateral pterygoid has various innervation patterns and nerve perforation patterns, this muscle is considered to consist of combinations of various muscle anlage (Akita et al, , ; Usui et al, ; Matsunaga et al, ; Sakaguchi‐Kuma et al, ). The new classification is based on the order of the ramification of the innervating branches and the positional relationships between the muscles and nerves (Fig.…”

Muscle attachment to the condylar process of mandible: anatomical considerations

“…We read with much interest the interesting article entitled 'An anatomic study of the attachments on the condylar process of the mandible: muscle bundles from the temporalis' by Sakaguchi-Kuma et al [3]. At this juncture, we wish to share our scientific views on this published article.…”