. Bulletin - United States National Museum. Science. 78 NATIONAL MUSEUM BULLETIN 2 73 the scapula and the caudalis is probably important also in respiration. Its moderate robustness suggests that the role of the serratus anterior in laterally rotating the lower scapular angle, as in raising the shoul- der, is still of some significance in the howler, but the wideness of that angle and its short distance from the center of rotation of the bone indicate that this mechanism might not be a very efficient one in the Upper subscapular nn. Lower subscapular n. N. axillaris
. Bulletin - United States National Museum. Science. 78 NATIONAL MUSEUM BULLETIN 2 73 the scapula and the caudalis is probably important also in respiration. Its moderate robustness suggests that the role of the serratus anterior in laterally rotating the lower scapular angle, as in raising the shoul- der, is still of some significance in the howler, but the wideness of that angle and its short distance from the center of rotation of the bone indicate that this mechanism might not be a very efficient one in the Upper subscapular nn. Lower subscapular n. N. axillaris , pars profunda , p. media N. musculocutaneus N. radialis N. ulnaris to minor medialis brachii medialis from Til to m'pectoralis major N. phrenicus Figure 26.—Plexus brachialis as observed in the left side of one male. Comparative anatomy: The division of the muscle by the scalenus medius is a constant feature in Alouatta (Ashton and Oxnard, 1963; Campbell, 1937; this report), Ateles (Ashton and Oxnard, 1963; Campbell, 1937; Hill, 1962), Lagothrix (Campbell, 1937; Hill, 1962) and Cebus (Campbell, 1937; Schiick, 1913b). Hill (1962) reports it also for the woolly spider monkey. Cebus (Schiick, 1913b), Lagothrix (Campbell, 1937) and the howler appear to have a rather uniform pars craniahs arising from the lower six cervical vertebrae and cranial ribs. On the other hand, the origin from C 2 is absent in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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