J Korean Med Sci.  2015 Apr;30(4):502-505. 10.3346/jkms.2015.30.4.502.

Multiple Muscular Variations in the Neck, Upper Extremity, and Lower Extremity Biased toward the Left Side of a Single Cadaver

• Bang JH
• Gil YC
• Yang HJ
• Jin JD
• Lee JH
• Lee HY

• KMID: 2164461
• DOI: http://doi.org/10.3346/jkms.2015.30.4.502

Abstract

Although numerous reports have found accessory or supernumerary muscles throughout the human body, multiple appearances of these variations biased toward one side of body are rare. We report a 76-yr-old male cadaver with an accessory head of the biceps brachii and palmaris profundus, and a muscular slip between the biceps femoris and semitendinosus on the left side in addition to a bilateral accessory belly of the digastric muscle. No remarkable nervous, vascular, or visceral variation accompanied these variations. An interruption of normal somitogenesis or myogenesis may be a cause of these variations.

Keyword

Anatomy; Asymmetry; Dissection; Nerve Compression Syndromes; Pseudomass

MeSH Terms

Aged
Cadaver
Humans
Lower Extremity
Male
Muscle, Skeletal/*pathology
Neck
Upper Extremity

Figure

• 

  Fig. 1 Multiple muscular variations in a single cadaver. (A) accessory bellies (ABs) of the digastric muscles. These muscles were an anterior aspect of a fibrous band (arrows) between the intermediate tendons of digastric muscles on both sides. (B) third head of the biceps brachii muscle (arrow) in the left arm. This muscle originated at the humeral shaft inferior to the insertional site of the coracobrachialis muscle (CB). (C) palmaris profundus (PP) in the left forearm. The aberrant muscle originated from the interosseous membrane near the middle part of ulnar shaft and insert at the styloid processes of the radius and ulna. (D) aberrant muscular slip (arrow) between the biceps femoris and semitendinosus muscles (BF and ST) originated together with the long head of the BF about 127.7 mm lower than the ischial tuberosity (IT) and joined the ST at 110.5 mm above the insertion. AnB, anterior belly; Br, brachialis; BB, biceps brachii; LoH, long head of biceps brachii; PQ, pronator quadratus; SH, sternohyoid muscle; ShH, short head of biceps brachii; SM, semimembranosus.

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