Muscle variations and abnormal branching and course of the ulnar nerve in the forearm and hand

Bozkurt, Mehmet; Tağıl, Süleyman Murat; Ersoy, M. Özcan; Tekdemi̇r, İbrahi̇m

doi:10.1002/ca.10094

Cited by 19 publications

(16 citation statements)

References 6 publications

(8 reference statements)

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“…There is much data about the anatomic description of these variants and their respective variable and abnormal motor innervation (Wahba et al, 1998;Gudemez et al, 2002;Bozkurt et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

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Accessory muscle in the hypothenar region: A functional approach

Bakinde

Yotovski

Voigt

et al. 2005

Annals of Anatomy - Anatomischer Anzeiger

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SummaryAn accessory muscle was found in the hypothenar region on both hands during routine cadaver dissection. This muscle originated from the tendon of the flexor carpi radialis, crossed the palma manus region superficially and inserted together with the abductor digiti minimi muscle into the ulnar aspect of the basis of the fifth proximal phalanx. The muscle was supplied by one branch arising from the main trunk of the ulnar nerve.Abnormalities of the hypothenar muscles have been described by many authors with a focus on their structural aspects, but there is not enough data about the possible functions they could induce. In our study, we try to elucidate the functions of this accessory muscle. We did not name the variant muscle as it has various functions, each similar to that of individual hypothenar muscles.

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Section: Discussionmentioning

confidence: 99%

“…Hypothenar muscle variations have been reported earlier in much detail in regards to their morphology and variable innervation pattern (Bucher, 1943;King and O'Rahilly, 1950;Wahba et al, 1998;Bozkurt et al, 2004). These reports have focused on the structural aspects of the variants.…”

Section: Introductionmentioning

confidence: 96%

Accessory muscle in the hypothenar region: A functional approach

Bakinde

Yotovski

Voigt

et al. 2005

Annals of Anatomy - Anatomischer Anzeiger

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“…These include ganglia (Shea and McClain, 1969;Uriburu et al, 1976), lipomas (Sakai et al, 2000), vascular anomalies (Rainer et al, 2002), musculotendinous arches, ligamentous attachments (Stern and Vice, 1983;Dellon and Mackinnon, 1988), anatomic variations of the nerve itself and aberrant muscles (O'Hara and Stone, 1988;Al-Qattan and Duerksen, 1992;Kang et al, 1996). Ulnar nerve compression may be associated with fractures or dislocations of carpal bones and of the distal radius and ulna (Bozkurt et al, 2004), over use injuries or occupational neuritis (Witmer et al, 2002), and rheumatoid arthritis (Upton et al, 1978). Anomalous muscles within Guyon's canal are common, with an estimated prevalence among the general public ranging from 22 to 35% (Dodds et al, 1990;Zeiss et al, 1992;Harvie et al, 2003).…”

Section: Discussionmentioning

confidence: 98%

Two unusual anatomic variations create a diagnostic dilemma in distal ulnar nerve compression

2008

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Diagnosis of peripheral neuropathies is based upon patterns of functional deficits and electrodiagnostic testing. However, anatomic variations can lead to confounding patterns of physical and electrodiagnostic findings. Authors present a case of ulnar nerve compression due to a rare combination of anatomic variations, aberrant branching pattern, and FCU insertion at the wrist, which posed a diagnostic and therapeutic dilemma. The literature related to isolated distal ulnar motor neuropathy and anatomic variations of the ulnar nerve and adjacent structures is also reviewed. This case demonstrates how anatomic variations can complicate the interpretation of clinical and electrodiagnostic findings and underscores the importance of thorough exploration of the nerve in consideration for possible variations.

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“…The palmaris longus muscle (PLM) may have numerous variations, being one of the most variable muscles in the human body (33%) (Schlafly and Lister, 1987;Bozkurt et al, 2004). The muscle has been classified by Reimann et al (1944), and may be absent, or vary in form, position, attachment, duplication, contain accessory slip, or substitute structures.…”

Section: Introductionmentioning

confidence: 99%

Epifascial accessory palmaris longus muscle

et al. 2006

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In hand reconstructive surgery the palmaris longus muscle is one of the most utilized donor site for tendon reconstruction procedures. However, its anatomic position is variable and anatomic variations may be responsible for median nerve compression. We report the case of a 40-year-old, right-handed woman, who presented with numbness and paresthesias in the palm and in the flexor aspect of the first, second, and third fingers of her right hand for the preceding 5 months, coinciding with increase of office work (typing). The clinical examination and radiological investigations (ultrasound and magnetic resonance) revealed a subcutaneous mass (15 mm x 2.3 mm x 6 cm), with a lenticular shape and definite edges at the level of the volar aspect of the distal third of the forearm. The fine-needle aspiration biopsy revealed the presence of striated muscle fibers. During surgery, a muscle belly was found in the epifascial plane. This muscle originated from subcutaneous septa in the middle forearm and inserted on to the superficial palmar aponeurosis with fine short tendon fibers. Exposure of the antebrachial fascia did not reveal any area of weakness or muscle herniation. The palmaris longus tendon, flexor digitorum superficialis tendons, and flexor carpi radialis tendon showed usual topography under the antebrachial fascia. The accessory muscle was excised and histology revealed unremarkable striated muscle fibers, limited by a thin connective sheath. The presence of an accessory palmaris longus (APL) located in the epifascial plane could be ascribed to an unusual migration of myoblasts during the morphogenesis. Although extremely rare, APL is worth bearing in mind as a possible cause of median nerve compression and etiology of a volar mass in the distal forearm.

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Muscle variations and abnormal branching and course of the ulnar nerve in the forearm and hand

Cited by 19 publications

References 6 publications

Accessory muscle in the hypothenar region: A functional approach

Accessory muscle in the hypothenar region: A functional approach

Two unusual anatomic variations create a diagnostic dilemma in distal ulnar nerve compression

Epifascial accessory palmaris longus muscle

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