An unusually large palmaris brevis muscle and its clinical significance

Nayak, Soubhagya R.; Krishnamurthy, Ashwin

doi:10.1002/ca.20542

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…Furthermore, anomalous abductor digiti minimi muscles were observed in five specimens. These results are consistent with previous reports (Lahey and Aulicino, ; Nayak and Krishnamurthy, ; Claassen et al, ). In these cases, two specimens showed variations of both the PBM and abductor digiti minimi muscle, which may aggravate the risk for compression of the ulnar nerve and artery.…”

Section: Discussionsupporting

confidence: 94%

“…Compared with the results of previous studies, the overall mean length (35.3 mm) and width (19.3 mm) of the PBM were usually longer and narrower, respectively (Shrewsbury et al, ; Chiou‐Tan et al, ; Schmidt and Lanz, ; Nayak and Krishnamurthy, ; Gil et al, ). All items related to the length of the PBM appeared to be larger in females than in male specimens.…”

Section: Discussioncontrasting

confidence: 51%

“…Most researchers claim that the PBM is attached to the dermis on the ulnar border of the hand (Saadeh, ; Ueda and Inoue, ; Standring, ; Eswaradass et al, ; Arányi and Kovács, ). However, few investigators have asserted that the insertion points of the PBM are the fascia of the abductor digiti minimi muscle and occasionally the pisiform bone (Chiou‐Tan et al, ; Schmidt and Lanz, ; Nayak and Krishnamurthy, ). The muscle is innervated by the superficial branch of the ulnar nerve and the proper palmar digital nerve (PPDN) and supplied by branches from the ulnar end of the superficial palmar arch (Schmidt and Lanz, ; Standring, ).…”

Section: Introductionmentioning

confidence: 99%

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Anatomical insights of the palmaris brevis muscle for clinical procedures of the hand

2017

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The purpose of the present study is to provide useful data for anatomists and clinicians by describing the topography of the palmaris brevis muscle, taking particular note of its morphology and distribution pattern of the nerve and artery. Forty-nine hands from Korean adult cadavers were used in this study. Parameters with respect to the size, scale, and location of the muscle were measured using a ultrasonography system, digital caliper, and surgical microscope. Histologic sections were obtained to clarify the positional relationship with surrounding tissues. The branches of the ulnar nerve and artery, which supply the muscle, were observed. The minimum and maximum depths in which the palmaris brevis muscle can be existed, including the thickness of the skin (1.9 mm), were 3.7 and 6.9 mm, respectively. It was inserted into the hypothenar fascia and the dermis. The main trunk of the ulnar nerve and artery were positioned under the lateral side of the muscle. The richest arborization of perforating branches of the ulnar nerve and artery was mostly confined to the distal section of the lateral side of the muscle. Our findings provide theoretical evidence of the palmaris brevis muscle for clinical procedures of the hand, such as botulinum toxin injection. Clinicians should pay attention not to injure the ulnar artery under the lateral side of the muscle. Botulinum toxin should be injected at a depth of between approximately 2 and 7 mm, considering the range of depth of the muscle. Clin. Anat. 30:397-403, 2017. © 2017 Wiley Periodicals, Inc.

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Section: Discussionsupporting

confidence: 94%

Section: Discussioncontrasting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

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Anatomical insights of the palmaris brevis muscle for clinical procedures of the hand

2017

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“…The Pbm is usually presented by a thin, quadrilateral in form muscle body, lying beneath the skin of the ulnar aspect of the palm. It has been reported to start from the flexor retinaculum and palmar aponeurosis and insert in the skin and fascia of the medial palm (Figure 1) [19][20][21][22][23][24].…”

Section: Anatomy Variations and Clinical Significance 21 Palmaris Bmentioning

confidence: 99%

Hypothenar Muscles and Guyon’s Canal

Георгиев¹

2021

Muscle Cell and Tissue - Novel Molecular Targets and Current Advances

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The increased number of articles in the last years about hypothenar variations and some misdescriptions and the role of the additional structures to ulnar nerve and artery compression, as well as my unostentatious contribution in the field, provoked me to write this chapter. The aim of it is to present in detail the usual hypothenar muscular anatomy, including the origins and insertions of the hypothenar muscles, their relations to each other, the vascular supply and innervation, the function of the muscles, the reported variations and their possible clinical implications. Herein, I also presented briefly the Guyon's canal anatomy and some interesting comments about it. Presenting the compendium about hypothenar muscles and the canal to my opinion will help the anatomists and the clinicians to better understand the clinically oriented anatomy. They also will be more qualified in the anatomical dissection course as well as during the surgical interventions. The detailed knowledge of the anatomy in the region would be also useful to medical students in better understanding the hypothenar region.

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“…; Chiou‐Tan et al. ), and its variant morphology (Przystasz, ; Nayak & Krishnamurthy, ), yet morphological measures in vivo of PB muscle length (M L ) and thickness (M T ) during rest and contraction at the ulnar canal have not been assessed. Investigating PB muscle architecture during dynamic contractions using ultrasound imaging provides insight as to whether the PB acts as a protective muscular barrier or simply tenses with no significant change in M L or M T .…”

Section: Introductionmentioning

confidence: 99%

Structural and functional anatomy of the palmaris brevis: grasping for answers

Moore

Rice

2017

Journal of Anatomy

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The palmaris brevis (PB) is a small cutaneous hand muscle that has been described as the most mysterious muscle from a functional and developmental perspective [Kaplan () Kaplan's Functional and Surgical Anatomy of the Hand]. Functionally, the PB is considered to deepen the hollow of the palm and to protect the neurovasculature of the ulnar canal. Although the function of the PB has been inferred from cadaveric observations, the electromyographic (EMG) activity of this muscle has not been explored systematically during specific movements of the hand. The purpose of this study was to record PB intramuscular EMG activity during dynamic grasping tasks, and to quantify the change in PB muscle length (M ) and thickness (M ) incurred during maximal contraction using ultrasound imaging. Intramuscular EMG was recorded from the PB in the dominant hands of 12 healthy participants (11 males, one female; age: 27 ± 4 years) during maximal abduction, flexion and opposition of the 5th digit, and two grasping tasks. Abduction of the 5th digit yielded the greatest EMG activity in most individuals (seven out of 11), and produced significantly less PB EMG activity when compared with grasping a cylindrical-shaped object (P = 0.003) but not a spherical-shaped object (P = 0.130). During maximal abduction of the 5th digit, PB M decreased in both the left (28 ± 11%; P = 0.002) and right (32 ± 5%; P = 0.002) hands. Similarly, a concomitant increase in PB M was observed in the left (68 ± 30%; P = 0.002) and right (85 ± 44%; P = 0.002) hands during the same contraction. These EMG results indicate that the PB is voluntarily activated during prehensile and non-prehensile movements of the hand with significant changes in muscle architecture. The study supports the preservation of the PB in surgical procedures based on its proposed protective role as a muscular barrier to the neurovasculature within the ulnar canal.

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An unusually large palmaris brevis muscle and its clinical significance

Cited by 4 publications

References 14 publications

Anatomical insights of the palmaris brevis muscle for clinical procedures of the hand

Anatomical insights of the palmaris brevis muscle for clinical procedures of the hand

Hypothenar Muscles and Guyon’s Canal

Structural and functional anatomy of the palmaris brevis: grasping for answers

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