. Bulletin - United States National Museum. Science. MUSCULAR SYSTEM OF THE RED HOWLING MONKEY 27 origin of the sternocleidomastoid, and a lower and deeper one for that of the digastric. The fleshy fibers of the sternocleidomastoid pass caudally, forward, and medially delimiting the anterior and posterior cervical triangles. During its course over the neck the muscle is contained within the investing layer of the cervical fascia which is particularly resistant near the mandible and continuous with the parotid sheath. The distal end of the muscle expands fan- wise at the insertion. Its fleshy f
. Bulletin - United States National Museum. Science. MUSCULAR SYSTEM OF THE RED HOWLING MONKEY 27 origin of the sternocleidomastoid, and a lower and deeper one for that of the digastric. The fleshy fibers of the sternocleidomastoid pass caudally, forward, and medially delimiting the anterior and posterior cervical triangles. During its course over the neck the muscle is contained within the investing layer of the cervical fascia which is particularly resistant near the mandible and continuous with the parotid sheath. The distal end of the muscle expands fan- wise at the insertion. Its fleshy fibers attach on the upper and posterior aspect of the medial two thirds of the clavicle, the sternoclavicular capsule, and the upper and posterior surfaces of the sternal process. The observations of Sirena (1871) coincide with mine. Nerve supply: The spinal accessory nerve, together with contri- butions from C II and III. V ® Figure 9.—Mastoid and styloid regions (1, supramastoid crest; 2, premastoid crest; 3, horizontal part of lambdoid crest (nuchal line); 4, descending part of the lambdoid crest also called postmastoid crest; 5, separation between the sternocleidomastoid and digastric areas; 6, horizontal ramus of postmastoid crest; 7, styloid region). 275-199 O - 68 - 3. 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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