High incidence of a third head of biceps brachii in females

Schwerdtfeger, Luke; Pascoe, Michael A.; Clapp, Tod R.

doi:10.1016/j.tria.2018.08.001

Cited by 6 publications

(12 citation statements)

References 9 publications

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“…Domestic mammals do not have a short head of the biceps brachii muscle, and it acts as a flexor of the elbow and in addition to an extensor of the shoulder . The presence of an accessory head has been described in humans with higher prevalence in females similar to findings in S leucopus . The function of the accessory head is not clear, given discrepancies between studies on whether or not prevalence varies by sex …”

Section: Discussionsupporting

confidence: 69%

Gross anatomy of the shoulder and arm intrinsic muscles in the white‐footed tamarin (Saguinus leucopus – Günther, 1876): Inter‐ and intraspecific anatomical variations

Monroy‐Cendales

García

Castañeda‐Herrera

2020

J of Medical Primatology

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Background Saguinus leucopus is a Neotropical primate with an arboreal quadrupedal locomotion pattern, which requires wide movements of the shoulder and arm. This investigation studies the muscles of these regions in order to serve as a basis for clinical and surgical procedures and to compare with other primates. Methods Gross dissections of twenty thoracic limbs were performed. Results The muscles examined were the deltoid, supraspinatus, infraspinatus, subscapularis, teres major, teres minor, coracobrachialis longus, coracobrachialis brevis, biceps brachii, brachialis, triceps brachii, tensor fasciae antebrachii, and anconeus epitrochlearis. The anconeus was absent. The following variants were found: an accessory head of the biceps brachii, the unilateral absence of the short head of the biceps brachii, an accessory head of the coracobrachialis longus, and one infraspinatus muscle innervated by the axillary nerve. Conclusions These muscles are adapted to quadrupedal locomotion and can have inter‐ and intraspecific variations in their attachments and innervation.

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Section: Discussionsupporting

confidence: 69%

Gross anatomy of the shoulder and arm intrinsic muscles in the white‐footed tamarin (Saguinus leucopus – Günther, 1876): Inter‐ and intraspecific anatomical variations

Monroy‐Cendales

García

Castañeda‐Herrera

2020

J of Medical Primatology

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“…Embryological studies also suggest that the MCN is derived from the MN [22]. Case of absence of the musculocutaneous nerve associated with a supernumerary head of biceps brachii was described by Pacholczak et al Thus, combinations of anatomical variations should be taken into account in the clinical practice [6,7,14,19,[24][25][26][27][28].…”

Section: Discussionmentioning

confidence: 99%

Unusual formation of the musculocutaneous and median nerves: a case report refined by intraneural dissection and literature review

et al. 2021

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This report presents a detailed anatomical investigation of an upper limb specimen showing an atypical formation of the musculocutaneous (MCN) and median (MN) nerves. The study was refined by intraneural dissection, which supplements earlier descriptions of similar anatomical variations and allows for revision of the accepted classification. The case described in this report was an incidental finding during routine dissection of a fixed isolated upper limb. Intraneural dissection revealed partial fusion between the MCN and aberrant bundles of the MN. Those aberrant bundles joined the main steam of the MN at the level at which the MCN branched off as an independent nerve. The procedure allowed the aberrant fibers of the MN to be differentiated from the MCN. The presence of separate bundles in a territory corresponding to the MCN was confirmed, although those bundles and the aberrant MN bundles were covered by a common epineurium. The aberrant MN bundles running within the MCN did not contribute to innervation of the forearm muscles. They rejoined the main nerve trunk in the arm. A comprehensive understanding of the diverse anatomical variations of the upper limb nerves could be crucial for the safety and success of surgical procedures, especially procedures for reconstructing the brachial plexus or its branches.

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“…Rodriguez-Niedenfuhr et al [37] distinguished three various origins of the third head of the BB [36]. The first type, originating from the antero-medial surface of the humerus, was the most common (frequency 9%).…”

Section: Discussionmentioning

confidence: 99%

“…The third type, occurring in only 0.3% of cases, was an infero-lateral humeral head. Its origin was located on the lateral intermuscular septum between the proximal attachment of the brachioradialis muscle and the insertion of the deltoid muscle [37].…”

Section: Discussionmentioning

confidence: 99%

The ulnar head of the pronator teres muscle originating from the third head of the biceps brachii: a very rare case

et al. 2023

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High incidence of a third head of biceps brachii in females

Cited by 6 publications

References 9 publications

Gross anatomy of the shoulder and arm intrinsic muscles in the white‐footed tamarin (Saguinus leucopus – Günther, 1876): Inter‐ and intraspecific anatomical variations

Gross anatomy of the shoulder and arm intrinsic muscles in the white‐footed tamarin (Saguinus leucopus – Günther, 1876): Inter‐ and intraspecific anatomical variations

Unusual formation of the musculocutaneous and median nerves: a case report refined by intraneural dissection and literature review

The ulnar head of the pronator teres muscle originating from the third head of the biceps brachii: a very rare case

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