Abstract
The subscapularis muscle is the largest muscle of the rotator cuff and its main function is internal rotation. It is morphologically variable in both point of origin and insertion. The presence of an accessory subscapularis muscle can lead to brachial plexus neuropathy. This report presents a very rare accessory subscapularis muscle originating from two distinct bands on the subscapularis and teres major muscles. The insertion was divided among four tendons. The fourth tendon is bifurcated. One of these was connected to the tendon of the subscapularis muscle and the other three inserted into the base of the coracoid process of the scapula. This anomalous muscle has the potential to entrap the nerves of the posterior cord such as the axillary, lower subscapular, and thoracodorsal nerves.
Highlights
The subscapularis muscle (SM) is the largest and the most powerful muscle of the rotator cuff [10, 11]
Subscapularis tendon tears are another problem connected with this muscle
The accessory subscapularis muscle (ASM) originated from the surface of the SM near the lateral border of the scapula and its insertion was fused with the capsule of the shoulder joint via a tendon [28]
Summary
The subscapularis muscle (SM) is the largest and the most powerful muscle of the rotator cuff [10, 11]. Subscapularis tendon tears are another problem connected with this muscle. The present report describes a very rare ASM originating as two distinct bands. One of these bands originated on the anterior surface of the SM, the other on the teres major muscle. The first band originated from an aponeurosis located on the surface of SM, 22.70 mm from the inferior angle of the scapula It contained both tendinous and muscular parts. The two bands joined to form one muscle belly The length from this connection to the division into four tendons was 36.39 mm. As for the second band (4b—length after division—13.56 mm), the width of the origin was 0.92 mm and its thickness there was 0.17 mm.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
