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Graham Dupont,Emre Yilmaz,Joe Iwanaga,Rod J,Oskouian,R,Shane Tubbs 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.2
Ossification of the mamillo-accessory ligament (MAL) is a misunderstood phenomenon; however, many have posited that it can result in nerve entrapment of the medial branch of the dorsal ramus causing zygapophyseal joint related low back pain. The MAL has been studied anatomically by few, yet the data indicate possible associations between ossification of this ligament and spondylosis. It has been proposed that mechanical stress upon the lumbar spine may also lead to progressive ossification of the MAL into a bony foramen.
Ossification of the roof of the porus trigeminus with duplicated abducens nerve
Graham Dupont,Juan Altafulla,Joe Iwanaga,Koichi Watanabe,R. Shane Tubbs 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.2
Ossification of parts of the intracranial dura mater is common and is generally accepted as an age-related finding. Additionally, duplication of the abducens nerve along its course to the lateral rectus muscle is a known, although uncommon anatomical variant. During routine cadaveric dissection, an ossified portion of dura mater traveling over the trigeminal nerve’s entrance (porus trigeminus) into the middle cranial fossa was observed unilaterally. Ipsilaterally, a duplicated abducens nerve was also observed, with a unique foramen superolateral to the entrance of Dorello’s canal. To our knowledge, there has been no existing report of a simultaneous ossified roof of the porus trigeminus with an ipsilateral duplicated abducens nerve. Herein, we discuss this case and the potential clinical and surgical applications. We believe this case report will be informative for the skull base surgeon in the diagnosis of neuralgic pain in the frontomaxillary, mandibular, orbital, and external and middle ear regions.
Report of an inferior rectal nerve variant arising from the S3 ventral ramus
Graham Dupont,Joe Iwanaga,Rod J. Oskouian,R. Shane Tubbs 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.1
In surgical approaches to the perineum in general and anal region specifically, considering the possible variations of the inferior rectal nerve is important for the surgeon. Normally, the inferior rectal nerve originates as a branch of the pudendal nerve. However, during routine dissection, a variant of the inferior rectal nerve was found where it arose directly from the third sacral nerve ventral ramus (S3). Many cases have described the inferior rectal nerve arising independently from the sacral plexus, most commonly from the fourth sacral nerve root (S4); however, few cases have reported the inferior rectal nerve arising from S3. Herein, we describe a variant of the inferior rectal nerve in which the nerve arises independently from the sacral plexus.
Bilateral sternocleidomastoid variant with six distinct insertions along the superior nuchal line
Graham Dupont,Joe Iwanaga,Juan J. Altafulla,Stefan Lachkar,Rod J. Oskouian,R. Shane Tubbs 대한해부학회 2018 Anatomy & Cell Biology Vol.51 No.4
Anatomical variations of the sternocleidomastoid muscle (SCM) have been observed to occupy multiple origins and insertion points and have supernumerary heads, sometimes varying in thickness. During routine dissection, a SCM was observed to have six distinct insertions that interface with the course of the superior nuchal line, ending at the midline, bilaterally. This variation was also seen to receive innervation from the accessory nerve as well as the great auricular nerve. To our knowledge, this variant of supernumerary insertions and nerve innervations has not yet been reported. These variants may pose as problematic during surgical approaches to the upper neck and occiput, and should thus be appreciated by the clinician. Herein we discuss the case report, possible embryological origins, and the clinical significance of the observed variant SCM.
Jenilkumar Patel(Jenilkumar Patel ),Graham Dupont(Graham Dupont ),Joho Katsuta(Joho Katsuta ),Joe Iwanaga(Joe Iwanaga ),Łukasz Olewnik(Łukasz Olewnik ),R. Shane Tubbs(R. Shane Tubbs ) 대한해부학회 2023 Anatomy & Cell Biology Vol.56 No.1
Tibialis anterior (TA) muscle originates from the lateral surface of tibia and its tendon attaches to the medial cuneiform and base of the first metatarsal. The TA muscle is responsible for both dorsiflexion and inversion of the foot. We present a case of bilateral TA muscle variations that diverge slightly from the current classification systems of this muscle. Recognizing variations such as these may be important for anatomists, surgeons, podiatrists, and physicians. Following routine dissection, an accessory tendon of the TA muscle was found on both sides. Accessory tendons of the extensor hallucis longus and extensor hallucis brevis joined to form a common tendon on both sides. We believe that this unique case will help further the classification systems for the tendons of the TA and also be informative for clinical anatomists as well as physicians treating patients with pathology in this region.
Clinical anatomy of the nerve to the mylohyoid
Paul Choi,Joe Iwanaga,Graham Dupont,Rod J. Oskouian,R. Shane Tubbs 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.1
The nerve to the mylohyoid (NM) originates from the mandibular division of the trigeminal nerve. The NM provides motor control to the mylohyoid and the anterior belly of the digastric. Its sensory component, as a variation of this nerve, has scantly been described in the literature. We discuss the current clinical implications of the NM based on its anatomical variations of the with the hopes of benefiting patients who are undergoing invasive maxillofacial procedures.