open access

Vol 73, No 2 (2014)
ORIGINAL ARTICLES
Published online: 2014-06-02
Submitted: 2013-09-20
Accepted: 2013-11-05
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Evaluation of additional head of biceps brachii: a study with autopsy material

L. E. Ballesteros, P. L. Forero, E. R. Buitrago
DOI: 10.5603/FM.2014.0028
·
Folia Morphol 2014;73(2):193-198.

open access

Vol 73, No 2 (2014)
ORIGINAL ARTICLES
Published online: 2014-06-02
Submitted: 2013-09-20
Accepted: 2013-11-05

Abstract

Additional head of the biceps brachii (AHBB) has been reported in different population groups with a frequency of 1–25%. The purpose of this study was to determine the incidence and morphologic expression of the AHBB as determined in a sample of the Colombian population. An exploration was conducted with 106 arms corresponding to unclaimed corpses autopsied at Institute of Legal and Forensic Medicine of Bucaramanga, Colombia. Using medial incision involvingskin, subcutaneous tissue, and brachial fascia, the heads of the biceps and their innervating branches were visualised. One AHBB was observed in 21 (19.8%) of the arms evaluated, with non-significant difference (p = 0.568) per side of presentation: 11 (52.4%) cases on the right side and 10 (47.6%) on the left side. All AHBBs were originated in the infero-medial segment of the humerus, with a mean thickness of 17.8 ± 6.8 mm. In 4 (19%) cases the fascicle was thin, less than 10 mm; in 7 (33.3%) cases it was of medium thickness, between 11 and 20 mm, whereas in 47.6% it was longer than 20 mm. The length of the AHBB was 118.3 ± 26.8 mm; its motor point supplied by the musculocutaneous nerve was located at 101.3 ± 20.9 mm of the bi-epicondylar line. The incidence of AHBB in this study is located at the upper segment of what has been reportedin the literature and could be a morphologic trait of the Colombian population; in agreement with prior studies, the origin was the infero-medial surface of the humerus.

Abstract

Additional head of the biceps brachii (AHBB) has been reported in different population groups with a frequency of 1–25%. The purpose of this study was to determine the incidence and morphologic expression of the AHBB as determined in a sample of the Colombian population. An exploration was conducted with 106 arms corresponding to unclaimed corpses autopsied at Institute of Legal and Forensic Medicine of Bucaramanga, Colombia. Using medial incision involvingskin, subcutaneous tissue, and brachial fascia, the heads of the biceps and their innervating branches were visualised. One AHBB was observed in 21 (19.8%) of the arms evaluated, with non-significant difference (p = 0.568) per side of presentation: 11 (52.4%) cases on the right side and 10 (47.6%) on the left side. All AHBBs were originated in the infero-medial segment of the humerus, with a mean thickness of 17.8 ± 6.8 mm. In 4 (19%) cases the fascicle was thin, less than 10 mm; in 7 (33.3%) cases it was of medium thickness, between 11 and 20 mm, whereas in 47.6% it was longer than 20 mm. The length of the AHBB was 118.3 ± 26.8 mm; its motor point supplied by the musculocutaneous nerve was located at 101.3 ± 20.9 mm of the bi-epicondylar line. The incidence of AHBB in this study is located at the upper segment of what has been reportedin the literature and could be a morphologic trait of the Colombian population; in agreement with prior studies, the origin was the infero-medial surface of the humerus.

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Keywords

arm, biceps brachii muscle, additional head of biceps brachii, musculocutaneous nerve

About this article
Title

Evaluation of additional head of biceps brachii: a study with autopsy material

Journal

Folia Morphologica

Issue

Vol 73, No 2 (2014)

Pages

193-198

Published online

2014-06-02

DOI

10.5603/FM.2014.0028

Bibliographic record

Folia Morphol 2014;73(2):193-198.

Keywords

arm
biceps brachii muscle
additional head of biceps brachii
musculocutaneous nerve

Authors

L. E. Ballesteros
P. L. Forero
E. R. Buitrago

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