The Experts below are selected from a list of 30 Experts worldwide ranked by ideXlab platform
Aktan Z.a. - One of the best experts on this subject based on the ideXlab platform.
-
Shape variations of the long Palmaris longus Muscle [Musculus Palmaris longus şekil varyasyonlari]
2001Co-Authors: Aktan Z.a.Abstract:In this experience morphologic variations and existence of Palmaris longus Muscle was present in only two cases (4.5%). Palmaris longus Muscle morpohlogy was studied in two groups. The location of the Palmaris longus tendine which is important in surgery was studied as three groups. The results were appraised separately by male-female and left-right. As result, Palmaris longus Muscle was found in 95.5% of the cases. Fusiforme shapped Muscle was determined in 95% cases. Tendineus part was at the first part and at the last part of this Muscle in 78.5%. Palmaris Brevis Muscle was existed in 95.4%
Bhagath Kumar - One of the best experts on this subject based on the ideXlab platform.
-
supernumerary fascicle of abductor digiti minimi Muscle and compression of ulnar nerve and ulnar artery a case report fasciculo supernumerario del musculo abductor del dedo minimo y compresion del nervio y arteria ulnares reporte de caso
2007Co-Authors: P Thejodhar, K Madhyastha, Bhagath KumarAbstract:SUMMARY: The supernumerary fascicles of abductor digiti minimi Muscle have been implicated in vascular and nervecompression. During routine dissection of an old male cadaver we observed an anomalous Muscle was found to take it’s origin from theantebrachial fascia and flexor retinaculum, traversed ulnar canal (Guyon’s) superficial to ulnar vessels and nerves to reach the proximalpart of abductor digiti minimi. The anomaly is one of a kind. Its course through Guyon’s canal could be a cause for Guyon’s canalsyndrome. It was innervated by the ulnar nerve. KEY WORDS: Ulnar nerve; Ulnar artery; Supernumerary fascicle; Abductor digiti minimi ; Guyon’s canal. INTRODUCTION The anomalies of the hypothenar Muscles can beclassified as absences, duplications, fusions withneighboring Muscles and variations of their origin andinsertion. Among them, there are also accessory orsupernumerary fascicles of abductor digiti minimi. Inaddition to being infrequent (Wood, 1868; Le Double, 1897;Reiman et al., 1944; Furnas, 1965), these anomalies are ofclinical interest in view of their relation to vessels and nerves.It is accepted that 2.9% of cases of ulnar nerve compressionare due to the existence of an aberrant Muscle (Shea &McClain, 1969). The majority of the reported cases representsurgical findings in patients with compression of ulnar nerve.This of course means that in many of these patients noanatomical details of the fascicle responsible for thecompression were available. In this report we describe theanatomical finding of an anomalous Muscle could be apotential cause for ulnar nerve compression. Guyon’s ca-nal syndrome also called as the ulnar tunnel syndrome,caused due to compression of the ulnar nerve as it passesthrough the ulnar canal (Guyon’s) is a well recognized entity(Cem Bozkurt, 2005). Guyon’s canal is a fibro-osseoustunnel in the anteromedial portion of the wrist, about 4- 4.5cm in length and contains the ulnar nerve and artery. Itsroof is formed by the palmar carpal ligament, (antebrachialfascia), and the Palmaris Brevis Muscle, the floor is formedby the hypothenar Muscles and the flexor retinaculum. Onthe radial side, the tunnel is limited by the junction of theroof and the flexor retinaculum and thenar Muscles. On theulnar aspect, the tunnel demarcated by the roof merging withthe, fascia covering the hypothenar Muscles.
P Thejodhar - One of the best experts on this subject based on the ideXlab platform.
-
supernumerary fascicle of abductor digiti minimi Muscle and compression of ulnar nerve and ulnar artery a case report fasciculo supernumerario del musculo abductor del dedo minimo y compresion del nervio y arteria ulnares reporte de caso
2007Co-Authors: P Thejodhar, K Madhyastha, Bhagath KumarAbstract:SUMMARY: The supernumerary fascicles of abductor digiti minimi Muscle have been implicated in vascular and nervecompression. During routine dissection of an old male cadaver we observed an anomalous Muscle was found to take it’s origin from theantebrachial fascia and flexor retinaculum, traversed ulnar canal (Guyon’s) superficial to ulnar vessels and nerves to reach the proximalpart of abductor digiti minimi. The anomaly is one of a kind. Its course through Guyon’s canal could be a cause for Guyon’s canalsyndrome. It was innervated by the ulnar nerve. KEY WORDS: Ulnar nerve; Ulnar artery; Supernumerary fascicle; Abductor digiti minimi ; Guyon’s canal. INTRODUCTION The anomalies of the hypothenar Muscles can beclassified as absences, duplications, fusions withneighboring Muscles and variations of their origin andinsertion. Among them, there are also accessory orsupernumerary fascicles of abductor digiti minimi. Inaddition to being infrequent (Wood, 1868; Le Double, 1897;Reiman et al., 1944; Furnas, 1965), these anomalies are ofclinical interest in view of their relation to vessels and nerves.It is accepted that 2.9% of cases of ulnar nerve compressionare due to the existence of an aberrant Muscle (Shea &McClain, 1969). The majority of the reported cases representsurgical findings in patients with compression of ulnar nerve.This of course means that in many of these patients noanatomical details of the fascicle responsible for thecompression were available. In this report we describe theanatomical finding of an anomalous Muscle could be apotential cause for ulnar nerve compression. Guyon’s ca-nal syndrome also called as the ulnar tunnel syndrome,caused due to compression of the ulnar nerve as it passesthrough the ulnar canal (Guyon’s) is a well recognized entity(Cem Bozkurt, 2005). Guyon’s canal is a fibro-osseoustunnel in the anteromedial portion of the wrist, about 4- 4.5cm in length and contains the ulnar nerve and artery. Itsroof is formed by the palmar carpal ligament, (antebrachialfascia), and the Palmaris Brevis Muscle, the floor is formedby the hypothenar Muscles and the flexor retinaculum. Onthe radial side, the tunnel is limited by the junction of theroof and the flexor retinaculum and thenar Muscles. On theulnar aspect, the tunnel demarcated by the roof merging withthe, fascia covering the hypothenar Muscles.
Charles L Rice - One of the best experts on this subject based on the ideXlab platform.
-
fiber type composition of the Palmaris Brevis Muscle implications for palmar function
Journal of Anatomy, 2017Co-Authors: Colin W Moore, Tyler S Beveridge, Charles L RiceAbstract:The Palmaris Brevis (PB) is a small Muscle of variant morphology located on the ulnar aspect of the palm, superficial to the hypothenar eminence. Functionally, the PB has been proposed to protect the neurovasculature of the ulnar canal from compressive forces during repetitive or intermittent trauma associated with grasping. Although PB function has been inferred from cadaveric observations, it is unknown whether it has the contractile capacity and fatigue-resistance necessary to withstand these functional demands. Insight into the functional specialization of the PB can be provided through investigating the proportions of type I and type II Muscle fibers by staining for myosin heavy chain (MHC) isoforms using immunohistochemical methods. Therefore, the purpose of this study was to quantify the proportion of type I and type II Muscle fibers to provide insight into the role of the PB in palmar function based on its gross histological structure. Sixteen PB specimens were harvested from the hands (eight right, eight left) of eight formalin-embalmed cadavers (mean age: 75 ± 14 years; three males, five females). PB Muscle composition was determined by labeling serial cross-sections with MHC type I and type II monoclonal antibodies. The results indicate that the PB is primarily composed of type I Muscle fibers (72.2 ± 13.7%), with no significant differences between left and right hands. Given the predominance of type I Muscle fibers, our findings indicate the PB may be fatigue-resistant and thus, capable of contracting for prolonged durations. This supports cadaveric observations indicating that the PB functions to protect the ulnar neurovasculature of the palm by providing a muscular barrier in addition to serving as a functional anchor to the hypothenar fat pad when objects are firmly compressed into the palm.
Thomas A Krouskop - One of the best experts on this subject based on the ideXlab platform.
-
electromyographic localization of the Palmaris Brevis Muscle
American Journal of Physical Medicine & Rehabilitation, 1996Co-Authors: Faye Y Chioutan, Sherine Boyd E Reno, Kevin N Magee, Thomas A KrouskopAbstract:ABSTRACT The Palmaris Brevis (PB) is the only Muscle frequently innervated by the superficial branch of the ulnar nerve. It is clinically involved in patients with sensory impairment of the ulnar nerve sparing the deep branch as seen in mild cases of cyclist or crutch palsy. It is also involved in Palmaris Brevis spasm syndrome. A technique is described that makes it possible to localize the PB distinctly from its neighbors by electromyographic (EMG) pin examination. Methods include prospective (1) anatomic measurement in 10 cadavers and (2) EMG pin examination in 12 normal subjects measuring rise time (ms) and RMS voltage output (μV). Results showed (1) the area of the PB in elderly cadavers was 2.1 ± 0.7 × 2.1 ± 0.3 cm with a thickness of 0.2 ± .01 cm and (2) in the live subjects, the Muscle could be located with identification of motor unit potentials having a rise time <1 ms 100% of the time. In conclusion, the PB can be localized for EMG analysis by using an approach parallel to surface of the palm. Clinically, it could be a useful complement to diagnose neuropathy involving the superficial fibers of the ulnar nerve.
