Anatomi Otot Daerah Bahu dan Lengan Atas Beruk (Macaca nemestrina)

Abstract

The aim of this study is to observed the anatomy of muscles in shoulder and arm region of pigtail macaque, also to described the function of the muscles in relation with the type of terrestrial quadrupedal locomotion. Furthermore, the results were compared with the muscles in shoulder and arm region of longtail macaque and chimpanzee which had different locomotion type. This study used two pigtail macaques which had been preserved in 10% formaline v/v. The observation was conducted on the shoulder and arm region morphology of pigtail macaque. The muscles were dissected by four dissection into the skin. The location of origin and insertion of the muscles were determined by muscle dissection, whereas the muscles name were based by Nomina Anatomica Veterinaria 2005. Then, the results were documented by photography equipment. The muscles which found in shoulder and arm region were the panniculus carnosus, trapezius, rhomboideus, serratus ventralis cervicis, serratus ventralis thoracis, pectoralis transversus, pectoralis descendens, pectoralis ascendens, deltoideus, coracobrachialis, teres major, latissimus dorsi, biceps brachii, brachialis, triceps brachii, teres minor, supraspinatus, infraspinatus, and subscapularis muscles. In general, the muscles which observed in pigtail macaque were more similar with those of longtail macaque than chimpanzee. The pigtail macaque is terresterial semiarboreal species, whereas the longtail macaque is arboreal semiterresterial one. This matter was estimated because the behavior of pigtail macaque were similar with longtail macaque. The differences among pigtail macaque, longtail macaque, and chimpanzee were the celerity of the locomotion movement which estimated because the flexibility of scapula movement and the strength of arm. The flexibility of scapula movement in pigtail macaque was influenced by the trapezius, rhomboideus, serratus ventralis cervicis, and serratus ventralis thoracis muscles. The strength movement of pigtail macaque when climbed the trees were influenced by the pectoralis transversus, pectoralis descendens, pectoralis ascendens, deltoideus, coracobrachialis, teres major, and latissimus dorsi muscles. The strength movement of pigtail macaque when walked on the ground was influenced by the biceps brachii, brachialis, triceps brachii, and latissimus dorsi muscles. The shoulder stability of pigtail macaque was influenced by the teres minor, supraspinatus, infraspinatus, and subscapularis muscles.