Abstract
Introduction:Biceps brachii is a muscle of the anterior compartment of arm, which is a flexor and supinator of the forearm, having two heads: short head and long head. The aim of this report is to discuss a rare case of bicep brachii muscle merging with medial intermuscular septum. Case report:During a routine dissection class held for medical students, we came across an unusual unilateral variation in the right arm of a male cadaver aged about 50 years. A tendinous slip or cord was arising from the medial surface of the proximal part of short head of biceps brachii muscle and its tendon. The accessory tendon emerged from the medial side of right biceps brachii muscle, and after crossing the brachial artery and median nerve it blended with the upper part of medial intermuscular septum. This variant tendon was very thick and was tense enough to compress the structures passing deep into it. Discussion:During certain arm movements, compression of brachial artery and median nerve may lead to various neurovascular syndromes. Such accessory tendons can also be used for tendon grafts and can be obtained with ease because of its superficial position in the arm. Conclusion:This case report can be useful for clinicians attending patients of neurovascular compression syndromes in upper limb and surgeons performing tendon grafts.
Highlights
Biceps brachii is a muscle of the anterior compartment of arm, which is a lexor and supinator of the forearm, having two heads: short head and long head
This case report can be useful for clinicians attending patients of neurovascular compression syndromes in upper limb and surgeons performing tendon grafts
The tendon from biceps brachii muscle belly inserts into the radial tuberosity, and bicipital aponeurosis from tendon is fused with the deep fascia of forearm[1]
Summary
Biceps brachii is a muscle of the anterior compartment of arm, which is a lexor and supinator of the forearm, having two heads: short head and long head. The accessory tendon emerged from the medial side of right biceps brachii muscle, and after crossing the brachial artery and median nerve it blended with the upper part of medial intermuscular septum. This variant tendon was very thick and was tense enough to compress the structures passing deep into it. Biceps brachii muscle is a prime supinator of the forearm and a powerful lexor at the elbow joint, supported by musculocutaneous nerve and brachial and anterior circum lex humeral arteries. It has two heads: short head and long head. The present study reports on a rare, unusual and clinically important variation associated with biceps brachii muscle
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