Title: A Study in the Origin of Biceps Brachii in North Coastal Andhra Pradesh
Authors: Pramila Padmini Mantraratnam*, Narasinga Rao Bhattam
DOI: http://dx.doi.org/10.18535/jmscr/v4i7.32
Variation in biceps brachi and musculocutaneous nerve are frequent variations. In the present study there is variation in the origin of biceps brachii with a co-existance of unsual formation of median nerve. Materials and methods:16 cadavers ( 32 upper limbs) were studied during 2013 -2016 as a part of routine dissection for MBBS students . Observations: out of 16 cadavers studied, one male cadaver showed tricipital origin of biceps brachii bilaterally and unilateral variation in the communicating twigs between lateral cord and medial root of median nerve and ulnar nerve. Conclusion: Variations in the origin of muscles can cause unusual bone displacement. Variation in communications between median and other nerves of upper limb is important while evaluation of clinical neurophysiology, planning a surgery after trauma and understanding of neurodysfuncton. Key words: biceps brachii, lateral cord , median nerve, pectoralis major, ulnar nerve 1. Nakatani T, Tanaka S, Mizukami S. Bilateral four-headed biceps brachii muscles: The median nerve and the brachial artery passing through a tunnel which is formed by a muscle slip from the accessory head. Clin.Anat. 1998; 11: 209-12. 2. Sweiter MG, Carmichael SW. Bilateral three headed biceps brachii muscles. Anat. Anz. 1980; 148: 346-49. 3. Sargon MF, Tuncali D, Celik HH. An unusual origin for the accessory head of biceps brachii muscle. Clin Anat., 1996; 9: 160–162. 4. Asvat R, Candler P, Sarmiento EE. High incidence of the third head of biceps brachii in South African populations. J Anat, 1993; 182: 101–104. 5. Flatow EL, Bigliani LU, April EW. An anatomic study of the musculocutaneous nerve and its relationship to the coracoid process. Clin Orthop Relat Res. 1989;(244):166–171. 6. Sonck WA, Francx MM, Engels HL. Innervation anomalies in upper and lower extremities: potential clinical implications. How to identify with electrophysiologic techniques. Electromyogr Clin Neurophysiol. 1991;31:67–80. 7. Sunderland S. Nerves and nerve injuries. Edinburgh, London, NewYork: Churchill Livingstone; 1978. 8. Anita S. FATING , Vishal M. SALVE A third head of the biceps brachii and coexisting fused higher origin of brachioradialis International Journal of Anatomical Variations (2011) 4: 31–33 9. Reilly D, Kamineni S. Unusual origin of three headed biceps brachii muscle Anatomy 2015;9(2):94–99.Abstract
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