Fetal Development of the Human Obturator Internus Muscle With Special Reference to the Tendon and Pulley

2015 ◽  
Vol 298 (7) ◽  
pp. 1282-1293 ◽  
Author(s):  
Michiko Naito ◽  
Ryoji Suzuki ◽  
Hiroshi Abe ◽  
Jose Francisco Rodriguez-Vazquez ◽  
Gen Murakami ◽  
...  
Keyword(s):  
Special Reference ◽  
Fetal Development ◽  
Obturator Internus ◽  
Obturator Internus Muscle

Fetal development of the human gubernaculum with special reference to the fasciae and muscles around it

2008 ◽  
Vol 21 (6) ◽  
pp. 547-557 ◽  
Author(s):  
Hitoshi Niikura ◽  
Satoshi Okamoto ◽  
Satoru Nagase ◽  
Tadao Takano ◽  
Gen Murakami ◽  
...  
Keyword(s):  
Special Reference ◽  
Fetal Development

Piriformis Syndrome and Other Nerve Entrapments of the Posterior Pelvis

2018 ◽  
Author(s):  
Aaron G. Filler
Keyword(s):  
Peripheral Nerve Injury ◽  
Pudendal Nerve ◽  
Cauda Equina ◽  
Piriformis Syndrome ◽  
Piriformis Muscle ◽  
Spinal Nerves ◽  
Nerve Entrapments ◽  
Obturator Internus ◽  
Surgical Options ◽  
Obturator Internus Muscle

Not every case of neurologically based pelvic/genital numbness/incontinence is due to cauda equina syndrome. Pelvic pain, incontinence, and sexual dysfunction can result from treatable peripheral nerve injury or entrapment affecting the pudendal nerves or impar ganglion. Learning the signs, physical exam findings, tests, and surgical options greatly expands a neurosurgeon’s range. The pudendal nerve and nerve to the obturator internus muscle arise after S2, S3, and S4 spinal nerves traverse the piriformis muscle. They exit the sciatic notch with the sciatic nerve but then re-enter the pelvis, where the pudendal nerve then gives off bladder, rectal, and genital branches.

scholarly journals Age-related alterations in female obturator internus muscle

2016 ◽  
Vol 28 (5) ◽  
pp. 729-734 ◽  
Author(s):  
Mark S. Cook ◽  
Laura Bou-Malham ◽  
Mary C. Esparza ◽  
Marianna Alperin
Keyword(s):  
Obturator Internus ◽  
Age Related ◽  
Obturator Internus Muscle

scholarly journals Intrapelvic Obturator Internus Muscle Injections: A Novel Fluoroscopic Technique

2015 ◽  
Vol 2;18 (2;3) ◽  
pp. E237-E243
Author(s):  
Assia Valovska
Keyword(s):  
Dimensional Space ◽  
Symptomatic Relief ◽  
Case Series ◽  
Pain Reduction ◽  
Pain Scale ◽  
Pelvic Cavity ◽  
Obturator Internus ◽  
Complex Anatomy ◽  
Scale Scores ◽  
Obturator Internus Muscle

The obturator internus (OI) muscle is important in adult chronic noninfectious pelvic, perineal, gluteal, and retrotrochanteric pain syndromes. Evaluation and management of these patients’ pain can be challenging because of the complex anatomy of this region, broad differential diagnosis, and lack of specific physical examination findings. Consequently, several clinicians have advocated the use of image guided injections to assist in the accurate diagnosis of OI-related symptoms and provide symptomatic relief to affected patients. We present 2 case series describing a novel fluoroscopically guided contrast controlled transpectineal approach to intrapelvic OI injections. Unlike prior fluoroscopically guided OI injection techniques, the approach described in the present 2 cases utilized multiple standard pelvic views, thus facilitating optimal needle positioning in three-dimensional space. This technique utilized standard fluoroscopic pelvic views to accurately measure needle depth within the pelvic cavity permitting the bulk of the OI to be injected in a controlled and safe fashion. The first patient underwent a left intrapelvic OI muscle injection with bupivacaine 0.25% and 40 mg methylprednisolone. The average pre- and postprocedural visual analog pain scale scores were 5 out of 10 and 2 out of 10, respectively, with a self-reported 75% pain reduction. The second patient underwent a right intrapelvic OI muscle injection with bupivacaine 0.25% and 40 mg methylprednisolone. The average pre- and postprocedural visual analog scale scores were 8 out of 10 and 1 out of 10, respectively, with a self-reported 90% pain reduction. Larger scale studies should be undertaken to evaluate the therapeutic efficacy and generalized accuracy of this technique. Key words: Obturator internus muscle, pelvic, perineal, gluteal, retrotrochanteric pain, fluoroscopic, transpectineal

scholarly journals Muscle Spindle Density of Lateral Rotators of the Thigh in Japanese Macaques and a Gibbon

2019 ◽  
Vol 208 (1-2) ◽  
pp. 1-12
Author(s):  
Sawa Takeuchi ◽  
Eishi Hirasaki ◽  
Hiroo Kumakura
Keyword(s):  
Muscle Spindle ◽  
Hip Joint ◽  
Muscle Length ◽  
Muscle Spindles ◽  
Functional Differentiation ◽  
Japanese Macaques ◽  
Obturator Externus ◽  
Obturator Internus ◽  
Obturator Internus Muscle ◽  
Species Specific

We examined the six small lateral rotators of the hip joint, which is one of the most flexible joints and allows kinematically complex motions of the hindlimb, to elucidate the functional differentiation among these muscles and to test the hypothesis that species-specific characteristics in hindlimb use during locomotion are reflected in the muscle spindle density and in other parameters of the deep small hip joint rotators. For these purposes, we estimated the number of muscle spindles of the superior gemellus muscle (SG), inferior gemellus muscle, quadratus femoris muscle, obturator internus muscle (OI), obturator externus muscle, and piriformis muscle in three Japanese macaques and a gibbon, using 30-µm-thick serial sections throughout each muscle length after azan staining. The numbers of muscle spindles per 10,000 muscle fibers were determined to compare inter-muscle variation. The spindle density was highest in the SG and lowest in the OI in the Japanese macaques, suggesting that the SG, which is attached to the tendon of the OI, functions as a kinesiological monitor of the OI. On the other hand, SG the was missing in the gibbon, and the OI in the gibbon contained more spindles than that in the Japanese macaques. This suggests that the SG and the OI fused into one muscle in the gibbon. We postulate that the relative importance of the deep small hip rotator muscles differs between the Japanese macaques and gibbon and that the gibbon’s muscles are less differentiated in terms of the spindle density, probably because this brachiating species uses its hindlimbs less frequently.

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