. Bulletin - United States National Museum. Science. MUSCULAR SYSTEM OF THE RED HOWLING MONKEY 47 Sirena (1871) says that this muscle is just as in man, but I could not verify a C 3 origin which is usually assigned to it. Nerve supply: Branches from the ventral rami of C IV to VI. M. scalenus medius (figs. 16, 17): It is the largest of the three scalenes and separated from the anterior by the brachial plexus and the subclavian artery. Its origin is by fleshy digitations from the anterior tubercle of C 1 to C 6. The muscle broadens in approaching the dorsolateral aspect of the thorax and is ant
. Bulletin - United States National Museum. Science. MUSCULAR SYSTEM OF THE RED HOWLING MONKEY 47 Sirena (1871) says that this muscle is just as in man, but I could not verify a C 3 origin which is usually assigned to it. Nerve supply: Branches from the ventral rami of C IV to VI. M. scalenus medius (figs. 16, 17): It is the largest of the three scalenes and separated from the anterior by the brachial plexus and the subclavian artery. Its origin is by fleshy digitations from the anterior tubercle of C 1 to C 6. The muscle broadens in approaching the dorsolateral aspect of the thorax and is anteroposteriorly flattened throughout. It passes superficial to the first two costal digitations of the serratus anterior but under cover of the others (fig. 17). A slip separates off the belly in the neck to be inserted on the anterior tubercle of C 3. The thoracic ending involves a variable number of ribs to which digitations are sent from the deep surface of the muscle. Insertion is on the second, third, and fourth ribs in two males and the. MAS. Figure 16.—Scalene muscles (1, reinforcing bundle to m. scalenus medius; 2, m. scalenus brevis posterior; 3, m. scalenus medius; 4, m. levator costae primus; 5, m. scalenus medius accesorius; 6, m. scalenus brevis anterior; 7, m. atlantoscapularis anterior.). 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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