. Bulletin - United States National Museum. Science. 34 NATIONAL MUSEUM BULLETIN 2 73 This fact, which I could not verify, would correspond to the presence of a splenius cervicis in the howling monkey. Nerve supply: A branch from the dorsal primary ramus of CIII. Long System Its muscles form a longitudinal mass which covers the deep oblique system and, more laterally, lies over the rib cage. Two of them, m. iliocostalis and m. longissimus, have a common origin in the lumbar region from a tough, extensive, and tendinous sheet, the aponeurosis sacrospinalis (figs. 11, 12, 13). M. spinalis l
. Bulletin - United States National Museum. Science. 34 NATIONAL MUSEUM BULLETIN 2 73 This fact, which I could not verify, would correspond to the presence of a splenius cervicis in the howling monkey. Nerve supply: A branch from the dorsal primary ramus of CIII. Long System Its muscles form a longitudinal mass which covers the deep oblique system and, more laterally, lies over the rib cage. Two of them, m. iliocostalis and m. longissimus, have a common origin in the lumbar region from a tough, extensive, and tendinous sheet, the aponeurosis sacrospinalis (figs. 11, 12, 13). M. spinalis lies medially to the other two and has a separate origin from the same lamina (figs. 11, 12). The longissimus is continued into the tail by m. extensor caudae lateralis and the two abductors. The aponeurosis sacrospinalis (figs. 11, 13): Strong tendinous fascicles arise from (1) the spines of most thoracic, all lumbar, sacral, and the first two caudal vertebrae, and (2) the corresponding ligamenta supraspinalla. They all run craniolaterally and are joined by similar fibers arising from (3) the dorsal half of the iliac crest and the region of the posterosuperior iliac spine. In this manner a shiny lamina is formed over the long muscles of the back. It extends laterally a little ®. Figure 12.—Section at the level of T9 showing arrangement of thoracolumbar fascia (1, anapophysis; 2, metapophysis; 3, m. spinalis; 4, m. longissimus; 5, m. iliocostalis; 6, thoracolumbar fascia; 7, sagittal septum; 8, m. latissimus dorsi; 9, m. serratus posterior inferior).. 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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