Annals of the South African MuseumAnnale van die Suid-Afrikaanse Museum . erior muscle. The muscle arises tendinously behind the origin of the genioglossusmuscle, from the deep surface of the sheet of fascia covering the throat muscula-ture ventrally and inserts fleshily along the ventral surface of the first cerato-branchial, ventromedially to the origin of the hyoglossus muscle. The muscleis innervated by a branch of the glossopharyngeal nerve. Depressor mandibulae group The m. depressor mandibulae (Figs 14-16) is a superficial sheet of fibresbehind the adductor musculature. It lies laterall
Annals of the South African MuseumAnnale van die Suid-Afrikaanse Museum . erior muscle. The muscle arises tendinously behind the origin of the genioglossusmuscle, from the deep surface of the sheet of fascia covering the throat muscula-ture ventrally and inserts fleshily along the ventral surface of the first cerato-branchial, ventromedially to the origin of the hyoglossus muscle. The muscleis innervated by a branch of the glossopharyngeal nerve. Depressor mandibulae group The m. depressor mandibulae (Figs 14-16) is a superficial sheet of fibresbehind the adductor musculature. It lies laterally to the stapedial artery, thelateral head vein and the hyomandibular ramus of VII. On its ventrolateralsurface it is obliquely overlain by the prominent cervicomandibularis musclewhich in its turn is covered by the dorsoventral fibres of the sheet-like constrictorcolli muscle. There is no indication in either Typhlosaurus aurantiacus or Acontiasmeleagris that the depressor mandibulae and cervicomandibularis musclesare continuous. 198 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 14. Cross-section of the skull at the level of the stapes. The depressor mandibulae consists of an anterior portion arising craniallyand £ posterior portion arising cervically. The anterior portion (dma, Figs 7,14-15) is spindle-shaped and lies immediately behind the stapes. It arises fleshilyfrom the anterolateral surface of the fused exoccipital-opisthotic bone, postero-dorsally to the quadrate head, and extends vertically downwards, laterally tothe posterior half of the stapedial footplate, to insert fleshily on the dorsal CRANIA I AND CERVICAL MUSCLES OF TYPHLOSAURUS AURANTIACUS AURANTIACUS 199
Size: 1417px × 1763px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsouthafr, bookcentury1800, bookdecade1890, bookyear1898
