MORPHOFUNCTIONAL CHARACTERISTICS OF THE LOWER HINDLIMB AND FOOT MUSCLES OF BORNEAN ORANGUTAN (Pongo pygmaeus)

Orangutan is a great ape that has anatomical and physiological aspects similar to those of gorillas chimpanzees, although orangutan more arboreal than other apes. This research aims study the morphofunctional characteristics lower hindlimb foot muscles Bornean its relation type locomotion daily behavior. was conducted on right leg male by observing morphology behavior through video observations. The results showed digital flexor are developed plantar as an adaptation towards activities require finger movements such gripping tree branches. Orangutans have rudimentary hallux, which related less intrinsic muscle indicated way grips branches dominantly using digits II-V. At certain time, orangutans active terrestrial causes extensor activity. It can be concluded in accordance function terrestrial.