Absence of Bilateral Musculocutaneous Nerves

Case Presentation

Austin J Anat. 2019; 6(1): 1089.

Absence of Bilateral Musculocutaneous Nerves

Shakthi Kumaran R1 and Chitra R2*

1Department of Anatomy, Aarupadai Veedu Medical College, India

2Department of Anatomy, Siddhartha Medical College, India

*Corresponding author: Chitra R, Department of Anatomy, Siddhartha Medical College, Vijayawada-520008 (AP), India

Received: December 13, 2018;Accepted: June 21, 2019; Published: June 28, 2019

Abstract

Variations of the lateral cord of brachial plexus have been reported by several authors. During routine educational dissection in the academic year (2008-2009), in a 55-year-old female cadaver, on the right side, lateral cord gave a communicating branch to ulnar nerve, another slender lateral root of median nerve which joined with medial root to form the median nerve which was joined by the complete lateral cord about 10 cm from the coracoid process. Along with this variation, absence of musculocutaneous nerve was noticed. The muscles of front of arm i.e. biceps brachii, brachialis and coracobrachialis received their nerve supply from median nerve. On the left side in the same cadaver, the lateral cord gave three branches- a branch to the coracobrachialis, a slender lateral root of median nerve and another branch to join the median nerve about 10 cm from the coracoid process. The musculocutaneous nerve was absent on the left side also. The biceps brachii and brachialis were supplied by the median nerve on the left side. The variations of the cords of brachial plexus should be kept in consideration while performing surgical exploration of the axilla and arm region to avoid damage to these important nerves

Keywords: Musculocutaneous nerve; Median nerve; Ulnar nerve; Brachial plexus; Coracobrachialis

Case Presentation

During routine educational dissection in the academic year (2008-2009), in a 55-year-old female cadaver, on the right side, lateral cord gave a communicating branch to ulnar nerve, another slender lateral root of median nerve which joined with medial root to form the median nerve which was joined by the complete lateral cord about 10 cm from the coracoid process (Figure 1). Along with this variation, absence of musculocutaneous nerve was noticed. The muscles of front of arm i.e. biceps brachii, brachialis and coracobrachialis received their nerve supply from median nerve. On the left side in the same cadaver, the lateral cord gave three branches- a branch to the coracobrachialis, a slender lateral root of median nerve and another branch to join the median nerve about 10 cm from the coracoid process (Figure 2). The musculocutaneous nerve was absent on the left side also. The biceps brachii and brachialis were supplied by the median nerve on the left side.

Citation: Shakthi Kumaran R and Chitra R. Absence of Bilateral Musculocutaneous Nerves. Austin J Anat. 2019; 6(1): 1089.