Welcome to International Journal of Anatomy and Research

 

 

Type of Article : Case Report

Year: 2014 | Volume 2 | Issue 4 | Page No. 650-652

Date of Publication: 30-11-2014

DOI: 10.16965/ijar.2014.503

BILATERAL SUPERNUMERARY HEADS OF BICEPS BRACHII

Ajit Kumar *, E.Ganesh, T.Malarvani, Manish Kr. Singh.

Department of Anatomy, Tribhuvan University, National Medical college, Birgunj, Parsa, Nepal.

Address: Ajit Kumar, Assistant Professor, Department of Anatomy, Tribhuvan University, National Medical college, Birgunj, Parsa, Nepal.
E-Mail: ajit.anatomy@gmail.com 

Abstract

The Biceps brachii is a muscle of   flexor compartment of the arm. The biceps brachii muscle shows variation in the number of heads, with an estimated 9–22% of all people having a supernumerary head. The most common variation is  third head, but four, five, or even seven heads have been  reported. Although supernumerary heads of the  biceps brachii muscle have been frequently reported, bilateral  asymmetric occurrence of supernumerary heads is relatively  rare. During a routine cadaveric dissection at the Department of Anatomy, National Medical College, Birgunj, Nepal, we encountered bilateral supernumerary heads of the biceps brachii muscle; Three heads on the right arm and four heads on the left arm in a 68 year old male cadaver. These additional heads were supplied by branches from  the musculocutaneous nerve. No additional anomalies were found on the remainder of both upper limbs of the same cadaver. It may cause compression of surrounding neurovascular structures or it may lead to variation of normal mechanical actions and also can cause erroneous interpretation during routine surgeries.
KEYWORDS: Biceps brachii, Supernumerary heads, Coracobrachialis, Musculocutaneous nerve.

References

1. Bergman RA, Thompson SA, Afifi AK, Saadeh FA. Compendium of human anatomic variation. Baltimore-Munich: Urban & Schwarzenberg; 1988. p.11.
2. El-Naggar MM, Zahir FI. Two bellies of the coracobrachialis  muscle associated with a third head of the biceps brachii muscle. Clin Anat 2001;14:379-82.
3. Kosugi K, Shibata S, Yamashita H. Supernumerary head of  biceps brachii and branching pattern of the musculocutaneus nerve in Japanese. Surg Radiol Anat 1992;14:175-85.
4. Rodríguez-Niedenführ M, Vázquez T, Choi D, Parkin I, Sañudo JR. Supernumerary humeral heads of the biceps brachii muscle revisited. Clin Anat 2003;16:197-203.
5. Warner JP, Krushell RJ, Masquelet A, Gerber C. Anatomy and relationships of the suprascapular nerve: anatomical constraints to mobilization of the supraspinatus and infraspinatus muscles in the management of massive rotator-cuff tears. J Bone Joint Surg Am 1992;74:36-45.
6. Bergman RA, Thompson SA, Afifi AK. Catalog of human variation. Baltimore and Munich: Urban & Schwarzenberg; 1984. p.27-30.
7. Sargon MF, Tuncali D, Celik HH. An unusual origin for the accessory head of biceps brachii muscle. Clin Anat 1996;9:160-2.
8. Khaledpour C. Anomalies of the biceps muscle of the arm. Anat Anz 1985;158:79-85.
9. Rai R, Ranade AV, Prabhu LV, Pai MM, Prakash. Third head of biceps brachii in an Indian population. Singapore Med J 2007;48:929-31.
10. Sonntag CF. On the anatomy, physiology and pathology of the chimpanzee. Proc Zool Soc Lond 1923;93:323-429.

Ajit Kumar, E.Ganesh, T.Malarvani, Manish Kr. Singh. BILATERAL SUPERNUMERARY HEADS OF BICEPS BRACHII. Int J Anat Res 2014;2(4):650-652. DOI: 10.16965/ijar.2014.503