Research Article
A Proposal for a New Classification of the Supernumerary Heads of the Biceps Brachii Muscle
Table 2
Morphometric parameters according to number of biceps brachii muscle bellies. Data presented as mean (standard deviation).
| | Parameter | Number of biceps brachii muscle bellies | value1 | | 1 () | 2 () | 3 () | 4 () | 5 () |
| | Proximal LHBT length | 133.7 (17.8) | 138.5 (30.7) | 138.4 (15.8) | 111.8 (14.3) | 183.6 (7.2) | 0.0014 | | Width of LHBT-belly junction | 6.2 (1.7) | 13.3 (3.5) | 13.4 (3.4) | 5.1 (0.6) | 8.4 (0.4) | 0.0001 | | Thickness of LHBT-belly junction | 1.3 (0.1) | 2.3 (0.9) | 2.5 (0.9) | 1.8 (0.5) | 2.3 (0.1) | 0.0369 | | Acc. LHBT length | | 68.3 (13.9) | 45.8 (5.3) | | | 0.0021 | | Width of acc. LHBT-belly junction | | 3.0 (0.8) | 3.8 (0.5) | | | 0.0277 | | Thickness of acc. LHBT-belly junction | | 1.4 (0.5) | 1.8 (0.4) | | | 0.0586 | | Proximal SHBT length | 79.8 (7.2) | 86.0 (18.5) | 69.1 (24.1) | 93.3 (2.5) | 87.7 (1.9) | 0.0086 | | Width of SHBT-belly junction | 4.2 (0.2) | 13.7 (4.1) | 12.2 (3.2) | 9.7 (3.4) | 5.4 (0.2) | 0.0001 | | Thickness of SHBT-belly junction | 1.1 (0.1) | 2.3 (0.8) | 2.4 (0.8) | 1.3 (0.1) | 2.0 (0.1) | 0.0011 | | Length of LHB | | 158.9 (26.9) | 140.9 (27.6) | 154.9 (11.8) | 150.4 (1.6) | 0.0211 | | Length of SHB | | 164.6 (38.8) | 168.8 (34.3) | 146.3 (18.9) | 170.6 (6.6) | 0.1773 | | Length of 3rd head | | | 82.9 (63.4) | 137.3 (6.8) | 154.7 (1.8) | 0.0063 | | Length of 4th head | | | 185.5 (0.0) | 107.1 (35.7) | 116.2 (1.0) | 0.2116 | | Length of 5th head | | | | | 110.7 (1.0) | — | | Width of distal myotendinous junction | 12.9 (2.6) | 11.8 (3.4) | 11.6 (3.8) | 11.3 (1.0) | 14.7 (1.0) | 0.3414 | | Thickness of distal myotendinous junction | 3.5 (0.4) | 3.2 (1.2) | 3.1 (0.9) | 3.8 (0.8) | 3.4 (0.4) | 0.2927 |
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1The result of ANOVA omnibus test; LHBT: long head of the biceps brachii; SHBT: short head of the biceps brachii tendon.
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