- 著者
- Tadasu K. Yamada Tint Tun Nyo-Nyo Tun Yin Yin Toke Deliver Htwe Mu Mu Aung Yuko Tajima
- 出版者
- National Museum of Nature and Sciece
- 雑誌
- 国立科学博物館研究報告A類(動物学) (ISSN:18819052)
- 巻号頁・発行日
- vol.48, no.4, pp.235-247, 2022-11-22 (Released:2022-11-22)
- 参考文献数
- 39
Balaenopterid whale specimens preserved in several institutions totaling 19 were examined. Specimens identified to species level were 14, i.e. 3 Balaenoptera musculus, 6 B. edeni, and 5 B. omurai. The remaining 5 specimens were not identified. The existence of B. omurai from Myanmar waters was confirmed based on the morphological characters of the skull and the first rib. This article is the first confirmation of this species in Myanmar. Among the two already “confirmed” species, B. musculus was identified by Smith et al. (1997) based on the actual specimen in the Natural History Museum, however for B. edeni, the specimens we examined were not observed for species identification and no preceding work reported the existence of B. edeni, except for the type specimen collected in Mon state in 1871 and now preserved in the Indian Museum, Kolkata (Anderson, 1879).
- 著者
- Hidehiko Saito Tadasu K. Yamada Yuko Tajima
- 出版者
- National Museum of Nature and Sciece
- 雑誌
- 国立科学博物館研究報告A類(動物学) (ISSN:18819052)
- 巻号頁・発行日
- vol.47, no.3, pp.135-155, 2021-08-20 (Released:2021-08-20)
- 参考文献数
- 59
The right forelimb of a western gorilla (Gorilla gorilla) was dissected with particular attention to the motor function of fingers of this species. The anatomical structure of the forearm and hand of our specimen of gorilla is not much different from that of the human. The palmar aponeurosis is absent. Ligamentous fibers, instead, extend to the palm from the flexor retinaculum to form the ligamentous septa along the flexor tendons. The short thumb seems to be carefully calculated to fulfill both roles of locomotion and feeding. The underdeveloped flexor pollicis longus muscle bifurcates from the flexor digitorum profundus muscle of the index finger. The extensor indicis is also underdeveloped; its tendon does not reach the index finger but attaches to the wrist. The extensor apparatus of the fingers composed of both the extrinsic and intrinsic systems is as well developed as in the human hand. During knuckle walking with the metacarpophalangeal joints in extension and the proximal interphalangeal joints in deep flexion, the former joint of each finger seems to be stabilized with integrated functions of the finger extensor, interosseous and lumbrical muscles, and sagittal bands as well as the groove at the metacarpal head. The ulnar antebrachial branch of the median nerve with a fine motor communicating branch from the ulnar nerve innervates the ulnar intrinsic muscles of the hand, which are innervated by the deep branch of the ulnar nerve in the human.