. Brigham Young University science bulletin. Biology -- Periodicals. 12 BniCHAM Young University Science Bulletin GENIOGLOSSUS HYOGLOSSUS MANDIBULOHYOIDEUS III PTERYGOMANDIBULAR^ BRANCHIOHYOIDEUS STERNOHYOIDEUS I STERNOHYOIDEUS EPISTERNOCLEIDOMASTOIDEl STERNOHYOIDEUS CLAVODELTOIDEUS SUPRACORACOIDEUS. Fig. 8. Phrt/nosoma platyrhinos plaiyrhinos. Ventral view of head and thorax musculature. Left Half: second depth. Right Half: third depth. BYU 22838, 22839, 22841, 22840, 22833. 22861. 22830, 22832. 22860. X pears continuous with the midline raphe to the wider, anterior part of the muscle. F
. Brigham Young University science bulletin. Biology -- Periodicals. 12 BniCHAM Young University Science Bulletin GENIOGLOSSUS HYOGLOSSUS MANDIBULOHYOIDEUS III PTERYGOMANDIBULAR^ BRANCHIOHYOIDEUS STERNOHYOIDEUS I STERNOHYOIDEUS EPISTERNOCLEIDOMASTOIDEl STERNOHYOIDEUS CLAVODELTOIDEUS SUPRACORACOIDEUS. Fig. 8. Phrt/nosoma platyrhinos plaiyrhinos. Ventral view of head and thorax musculature. Left Half: second depth. Right Half: third depth. BYU 22838, 22839, 22841, 22840, 22833. 22861. 22830, 22832. 22860. X pears continuous with the midline raphe to the wider, anterior part of the muscle. From the wider, anterior part of the muscle where fibers meet at the midline raphe to form the tendinous origin, fibers separate in an inverted V form and extend posterolaterallv to insert onto the distal one-third of the ceratobranchial I. Approximate- ly the most distal fourth of this muscle is over- lapped superficially by the mandibulohyoideus I. The mandibulohvoideus II is deep to the in- termandibularis complex, mesial to the mandib- ulohvoideus I, and overlaps parts of the genio- glossus and hyoglossus. M. Iatissinnis dorsi (Figs. 10 and 14) origi- nates deep to the skin from the thick, super- ficial, dorsal fascia of the back. The fibers of this broad, thin, rather triangu- lar-shaped muscle extend anteroventrolaterally and split into a large anterior bodv and small posterior slip. The anterior bodv is composed of approximately three-fourths of the muscle fibers which continue between the anconaeus cora- coideus and anconaeus scapularis muscles to in- sert tendinouslv onto the processus lattissimus dorsi of the humeral shaft. The posterior slip is composed of the remaining posterior muscle fibers (approximately one-fourth of the muscle) and extends anteroventrally to insert onto the lateral, posteriorlv extending fibers of the pec- toralis approximately five millimeters posterior to the delto-pectoral crest (insertion of the pec- toralis) of the humerus. M. anconaeus sca
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