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IJAR.2017.397

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Type of Article:  Original Research

Volume 5; Issue 4.2 (November 2017)

Page No.: 4566-4569

DOI: https://dx.doi.org/10.16965/ijar.2017.397

BILATERAL DOUBLE BELLIES OF ABDUCTOR POLLICIS LONGUS

Gargi Soni *1, B Ravindra Kumar 2a,2b.

*1 Head, Department of Anatomy, International Medical School, Management & Science University, Malaysia.

2a, Former Lecturer, Department of Anatomy, International Medical School, Management & Science University, Malaysia.

2b Research Scholar, Department of Anatomy, Sri Padmavathi Medical College for Women, SVIMS University, Tirupati, Andhra Pradesh, India.

Address for Correspondence: Dr. Gargi Soni, Head, Department of Anatomy, International Medical School, Management & Science University, Malaysia. E-Mail: bhasingargi@rediffmail.com

ABSTRACT 

Introduction: The variations in the insertion and number of tendons of abductor pollicis longus are very common and have been highlighted by many researchers, but the variations in the origin of abductor pollicis longus (APL) have not received much attention.

Materials: During the routine dissection of 12 upper limbs from six cadavers in the Management and Science University, Malaysia, bilateral double bellies at origin of abductor pollicis longus were found in ten limbs and in all twelve limbs a double tendon of abductor pollicis longus was found. The additional muscle bellies in all the cases arose from the lateral aspect of the distal portion of abductor pollicis longus muscle. The lateral tendon, lying adjacent to the extensor pollicis brevis tendon, was considered the main apl tendon, while the medial tendons were regarded as accessory ones.

Observations: The lateral tendons were inserted into the base of the first metacarpal bone; to its anterolateral surface in 8 limbs and on its lateral surface in 4 limbs. The medial accessory tendons of the APL had different sites of insertions at: the anterolateral surface of base of 1st metacarpal bone in 8 limbs and on trapezium in four limbs.

Conclusion: The knowledge of presence of accessory tendons of APL is important for the hand surgeon not only to prevent unintentional injuries but also to be able to use these accessory tendons as grafting material and also the accessory tendons of APL contribute to the development of de quervain’s tenosynovitis.

Key words: Abductor Pollicis, Double tendons, Double Bellies.

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Cite this article: Gargi Soni, B Ravindra Kumar. BILATERAL DOUBLE BELLIES OF ABDUCTOR POLLICIS LONGUS. Int J Anat Res 2017;5(4.2):4566-4569. DOI: 10.16965/ijar.2017.397