Publication details
Nový pohled na uspořádání šlach svalů rotátorové manžety - studie na kadáverech
| Title in English | New aspects in the rotator cuff muscles arrangement - a cadaver study |
|---|---|
| Authors | |
| Year of publication | 2017 |
| Type | Article in Periodical |
| Magazine / Source | Ortopedie |
| MU Faculty or unit | |
| Citation | |
| Field | Traumatology and orthopaedic surgery |
| Keywords | rotator cuff; subscapularis muscle; accessory muscle |
| Description | Introduction: It has been mentioned in the earlier literature, that the subscapularis muscle usually has variations in the arrangement of its lower margin. The aim of this prospective study was to investigate the structure and arrangement of this lower part of the subscapularis muscle. Methods and Materials: We dissected both shoulders of 25 cadavers, 11 males and 14 females, using Henry´s deltopectoral approach. If the accessory muscle underneath the lower margin of the subscapularis muscle was found, we studied its origin on the scapula, insertion to the humerus, the length and width of the muscle and its relationship to the subscapularis muscle. Results: In the investigated group of 50 shoulders, the accessory muscle was present in 42 of them. In those bodies with the accessory muscle it was always found bilaterally. In all male shoulders (N = 22), the accessory muscle was found in 18 cases (81,8 %), in all female shoulders (N = 28) in 24 cases (85,7 %). The average muscle origin width was 1,7 cm, the average muscle insertion width was 1,2 cm. The average muscle length was 7,2 cm. Discussion: The question is, if it is really possible there is in the human shoulder the muscle, that has not been described and studied in detail until now. In the literature from 19th and 20th century the presence of accessory muscle fibres is already mentioned, more or less dependent on the subscapularis muscle. Conclusion: Due to its origin on the scapula near the origin of the subscapularis muscle and insertion near the subscapularis muscle on the humerus, the accessory muscle should be considered as the separate muscle possibly functioning as the opponent of the supraspinatus muscle. |