A very rare case of a thoracobrachialis muscle

• Published in: Surgical and radiologic anatomy (English ed.) Vol. 45; no. 11; pp. 1493 - 1496
• Main Authors: Zielinska, Nicol, Karauda, Piotr, Węgiel, Andrzej, Szewczyk, Bartłomiej, Olewnik, Łukasz
• Format: Journal Article
• Language: English
• Published: Paris Springer Paris 01.11.2023; Springer Nature B.V
• Subjects: Anatomic Variations; Anatomy; Arm; Cartilage; Dissection; Donations; Fascia; Humerus; Imaging; Medicine; Medicine & Public Health; Morphology; Orthopedics; Paresthesia; Radiology; Sensation; Surgery; Chondroepicondylaris; Thoracobrachialis; Chondroepitrochlearis; Neurovascular compression; Pectoroepicondylaris; Biceps brachii; Pectoralis major; Accessory muscle; Pectoralis quartus; Medial epicondyle
• ISSN: 1279-8517; 0930-1038; 1279-8517
• DOI: 10.1007/s00276-023-03240-6

The anterior arm compartment includes the biceps brachii muscle, brachialis muscle, and coracobrachialis muscle, and they are characterized by different morphological variations. During standard anatomical dissection of right upper limb, an variant muscle was found. It originated from the fascia covering the long head of biceps brachii and from the tendon of pectoralis major muscle. It also connected to the brachial fascia. It also demonstrated a long thin tendon which was distally attached to the medial epicondyle of humerus. Knowledge about the morphological variations in this region is clinically important because of their direct correlation with neurovascular structures, which may lead to pathologies such as tingling, muscle weakness, paresthesia, and loss of sensation.