Karakteristik Morfofungsi Otot-otot bahu dan Lengan atas Orang Uan Kalimanta (Pongo pygmaeus)
Date
2021-07-13Author
Putra, Ardiansyah
Nurhidayat
Wibawaan, I wayan teguh
Metadata
Show full item recordAbstract
Orangutans are arboreal primates that have similarities to gorillas and
chimpanzees from both anatomical and physiological aspects, although there are
distinct behaviors that allow for differentiation in the structure of the locomotor
apparatus. This research aims to study the anatomy of the muscles of the
shoulders and upper-arm of the Bornean orangutan associated with the type of
locomotion and daily behavior. This study was conducted by observing the
morphology of the shoulders and upper-arms muscles and watching their
behaviors through video observations. The results showed that the rotator cuff
muscles in orangutans were relatively thick resulted in well-fixed shoulders.
Musculus rhomboideus occipitalis is only observed in orangutans to facilitate
them during arboreal activities such as brachiation. The external trunk muscle in
orangutans is found to be relatively large compared to chimpanzees and gorillas,
due to the lifting of the upper arms while in trees and on the ground. Musculus
brachioradialis and musculus biceps brachii were well developed as flexors of the
elbow joint and hold the body mass while climbing up the tree. The Bornean
orangutans' activities are more arboreal than those in gorillas and chimpanzees,
thus their shoulder and upper arm muscles were more developed to support
brachiation activities. Orangutans are arboreal primates that have similarities to gorillas and
chimpanzees from both anatomical and physiological aspects, although there are
distinct behaviors that allow for differentiation in the structure of the locomotor
apparatus. This research aims to study the anatomy of the muscles of the
shoulders and upper-arm of the Bornean orangutan associated with the type of
locomotion and daily behavior. This study was conducted by observing the
morphology of the shoulders and upper-arms muscles and watching their
behaviors through video observations. The results showed that the rotator cuff
muscles in orangutans were relatively thick resulted in well-fixed shoulders.
Musculus rhomboideus occipitalis is only observed in orangutans to facilitate
them during arboreal activities such as brachiation. The external trunk muscle in
orangutans is found to be relatively large compared to chimpanzees and gorillas,
due to the lifting of the upper arms while in trees and on the ground. Musculus
brachioradialis and musculus biceps brachii were well developed as flexors of the
elbow joint and hold the body mass while climbing up the tree. The Bornean
orangutans' activities are more arboreal than those in gorillas and chimpanzees,
thus their shoulder and upper arm muscles were more developed to support
brachiation activities.