The ulnar nerve is surrounded by the tendon expansion of the flexor carpi ulnaris muscle at the wrist: an anatomical study of Guyon’s canal

Yamamoto, Ryōta; Izumida, M; Sakuraya, Tohma; Emura, Kenji; Arakawa, Takamitsu

doi:10.1007/s12565-021-00607-w

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…Apart from carpal tunnel syndrome in humans, entrapment neuropathy of the ulnar nerve is also mentioned in this region. The region where the ulnar nerve passes through the carpal canal is called the Guyon canal (10)(11)(12)(13)(14).…”

Section: Original Research Article Introductionmentioning

confidence: 99%

Anatomical Structures in the Rabbit Carpal Tunnel: Comparison With Human

Turker Yavas,

Dabanoglu,

Akkoc

2024

SVR

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In this study, it was aimed to reveal the morphological and morphometric changes of anatomical structures passing through the carpal tunnel, which is an entrapment neuropathy location for the median nerve. It was also aimed to evaluate the potential of rabbits as an animal model for carpal tunnel research. New Zealand rabbit cadavers were enrolled, and their wrists were investigated using the histological method in this study. ImageJ was used to measure histological sections stained with hemoxylin-eosin. The carpal tunnel was examined at three levels: entrance, inside, and exit. Flexor retinaculum comprises two layers, encircling the carpal tunnel from the palmar side. The deep and superficial digital flexor tendons, and radial carpal flexor tendon were observed within the carpal tunnel but not the flexor pollicis longus tendon. The median and ulnar vascular nerve bundles reside between two layers of flexor retinaculum in the carpal tunnel. The areas of these anatomical structures were measured from images at three levels. Since the flexor retinaculum was located at the entrance and inside, the carpal tunnel area was measured at both levels. The narrowing in the area from the carpal tunnel entrance to the inside of the carpal tunnel in rabbits and the decrease in connective tissue bring the anatomical structures here closer together. This clearly demonstrates that the carpal tunnel is an entrapment neuropathy area, particularly for the median nerve. Upon comparing rabbit and dog carpal tunnel anatomy, it has been shown that rabbits exhibit a greater resemblance to humans, particularly with regard to the flexor retinaculum. This study emphasizes the importance of using the rabbit model to gain insights into carpal tunnel syndrome. It demonstrates similarities between rabbit and human anatomy, underscoring the value of this animal model for future research. Anatomske strukture v karpalnem kanalu kunca: primerjava s človekom Izvleček: Cilj te raziskave je bil raziskati spremembe v morfologiji in morfometriji anatomskih struktur v karpalnem kanalu, natančneje na mestu ukleščenja medianega živca. Poleg tega smo želeli oceniti primernost kuncev kot živalskega modela za študije karpalnega kanala. V ta namen smo uporabili trupla novozelandskih kuncev in opravili histološki pregled njihovih zapestij. Histološke rezine, obarvane s hematoksilinom in eozinom, smo analizirali s programom ImageJ za pridobitev meritev. Naš pregled je bil osredotočen na tri nivoje karpalnega kanala: vhod, notranjost in izhod. Karpalni kanal je obdan z dvema plastema flektornega retinakuluma na palmarni strani. Znotraj karpalnega kanala smo opazovali globoke in površinske kite upogibalk prstov in radialnih upogibalk zapestja, ne pa tudi tetiv dolge upogibalke. Žilni živčni snopi medianega in ulnarnega živca se nahajata med obema plastema flektornega retinakuluma znotraj karpalnega kanala. Da bi ocenili velikost teh anatomskih struktur, smo izmerili njihove površine na podlagi slik, posnetih na treh prej omenjenih ravneh.Ob upoštevanju prisotnosti flektornega retinakuluma smo meritev površine karpalnega kanala izvedli tako na vhodu kot znotraj kanala. Pri kuncih zožitev območja od vhoda do notranjosti karpalnega kanala skupaj z zmanjšanjem vezivnega tkiva povzroči, da se anatomske strukture približajo. To zagotavlja jasen dokaz, da je karpalni kanal mesto, kjer se pojavi utesnitvena nevropatija, ki posebej vključuje mediani živec. S primerjavo anatomije karpalnega kanala pri kuncih in psih je bilo ugotovljeno, da so kunci bolj podobni ljudem, zlasti v smislu flektornega retinakuluma. Ta raziskava poudarja pomen uporabe kunčjega modela za preučevanje sindroma karpalnega kanala, saj prikazuje podobnosti med kunčjo in človeško anatomijo ter poudarja pomen tega živalskega modela za prihodnje preiskave. Ključne besede: karpalni kanal; morfometrija; histologija; mediani živec; ulnarni živec; flektorni retinaculum

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Section: Original Research Article Introductionmentioning

confidence: 99%

Anatomical Structures in the Rabbit Carpal Tunnel: Comparison With Human

Turker Yavas,

Dabanoglu,

Akkoc

2024

SVR

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“…Therefore, in the opinion of the authors of this paper, an analysis based on a larger number of cases is necessary. Recent literature reports are mainly on the evaluation of single case -studies (Ata et al 2018;Bhardwaj et al 2013;Pressney et al 2020;Yamamoto et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Anatomical variations of the flexor carpi ulnaris in the fetal period

Siwek

Krupa

Mrożek

et al. 2023

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Introduction: The Flexor Carpi Ulnaris (FCU) is a part of the palmar the forearm muscle group and one of the most important muscles for upper limb functioning - is responsible for flexion and adduction of the hand at the radio-carpal joint. There are clinically significant but rare anatomical variations of FCU. The variability of the FCU has not been described up to now, and no typology of the muscle based on its more variable terminal attachment has been created. Aim of the study: Determination of FCU muscle typology based on available fetal material. Material and methods: A total of 114 human fetuses (53 female, 61 male) between 117 and 197 days of fetal life were eligible for the study. Preparations were carried out using classical anatomical techniques based on a previously published procedure. Thanks to that significant anthropometric landmarks were visible for the gathering of metric measurements. Metric measurements were taken and statistically analysed using R-Project software. Results: A new typology was created based on variable muscle insertions. Additionally, the presence of an atypically located, additional, separated muscle belly was described. A comparison of measurements of the left upper limb in relation to the right upper limb showed significant differences for forearm length to the anthropometric point of the stylion radiale, limb length, total FCU length and FCU length which means that the left limb is longer than the right limb. A comparison of FCU insertion types between left and right upper limb showed there’s no significant difference between counts of each type. Conclusion: The FCU is a muscle that is easy to palpate and may therefore act as a topographical marker for healthcare professionals. Knowledge of its variability is not only of theoretical importance but also has clinical significance. The current publication demonstrates presence of variability in FCU terminal attachment. Certainly, this topic requires further research and continued work on a detailed understanding of forearm anatomy in the fetal period.

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“…Intermittent traction is a pathogenetic mechanism in which the ulnar nerve becomes locked at single or multiple locations, limiting the nerve's free gliding. In addition, reactive alterations at the MCL, adhesion within the tunnel, hypertrophy of surrounding muscle, or joint modifications can cause nerve compression in the cubital tunnel (8). The ADM muscle is one of the interested muscles that receive innervation by the ulnar nerve.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Activity In Abductor Digiti Minimi )Adm( As An Early Indicator Of The Irritation Of The Ulnar Nerve At The Elbow Joint

Yahya

Saeed

Sabah³

2022

JHTD

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The cubital tunnel syndrome (CuTS) is a neurological disorder that affects the ulnar nerve as it passes through the elbow joint. It may induce several physical disabilities in the affected person. The early manifestation of CuTS maybe not be well recognized clearly. The abductor digiti minimi (sometimes abductor digiti quinti, ADM) muscle is located on the ulnar side of the palm in human anatomy. The study aims to evaluate the feasibility of using the early appearance of spontaneous activity in ADM as a predictor of ulnar nerve irritation at the elbow joint. Patients and method: 67 patients were included in the study, and all of them complained of neurological manifestations. A short segment study for the ulnar nerve at the elbow joint and the Guyon`s canal was done. In addition, needle EMG was done for the ulnar innervated muscles below the level of the elbow joint, including first dorsal interossii (FDI) and abductor digiti minimi (ADM) muscles. Results: 18 of them show normal NCS of the ulnar nerve. 10 show spontaneous activity by needle EMG in the ADM only, and 9 show normal needle EMG. Conclusion: the presence of spontaneous activity in the ADM muscle may be the early signs of electrodiagnosis of cubital tunnel syndrome.

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The ulnar nerve is surrounded by the tendon expansion of the flexor carpi ulnaris muscle at the wrist: an anatomical study of Guyon’s canal

Cited by 4 publications

References 15 publications

Anatomical Structures in the Rabbit Carpal Tunnel: Comparison With Human

Anatomical Structures in the Rabbit Carpal Tunnel: Comparison With Human

Anatomical variations of the flexor carpi ulnaris in the fetal period

Spontaneous Activity In Abductor Digiti Minimi )Adm( As An Early Indicator Of The Irritation Of The Ulnar Nerve At The Elbow Joint

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