Human anatomy, including structure and development and practical considerations . d mention. The trigonum hypoglossi is seen, especially when examined under fluid with a hand-lens,to include two subdivisions, a narrow median and a broader lateral. The first of these is con-ve.\, about 5 mm. long by i mm. wide, and corresponds to the rounded upper end of the nucleusof the twelfth nerve ; it is, therefore, appropriately called the eminentia hypoglossi (.Streeter).The entire hypoglossal nucleus, however, is of much larger size (about 12 mm. long by 2 ) and some 5 nmi. below the ti
Human anatomy, including structure and development and practical considerations . d mention. The trigonum hypoglossi is seen, especially when examined under fluid with a hand-lens,to include two subdivisions, a narrow median and a broader lateral. The first of these is con-ve.\, about 5 mm. long by i mm. wide, and corresponds to the rounded upper end of the nucleusof the twelfth nerve ; it is, therefore, appropriately called the eminentia hypoglossi (.Streeter).The entire hypoglossal nucleus, however, is of much larger size (about 12 mm. long by 2 ) and some 5 nmi. below the tip of the calamus scriptorius, ventral (anterior) to the Fig. 949. IV. nerve Collicuhis inferiorSuperior cerebellar peduncle Stria pcmlisMedian foveaV. nerve Superior foveaEminentia teres Acoustic striae VIII. nerve IX. and X. ner\es Trigonum acustici Trigonum hypoglossiTrigonum or fovea vag Funiculus separans Area postrema Nucleus cuneatus Nucleus gracilis Floor of the fourth ventricle; areas corresponding to nuclei of nerves are shown on right half of figure. X i. (Streeter.). Area n. trigemini N. facialis Area n. abducentis Area n. vestibularisArea n. cochlearis Area nuc. funic, teretisFuniculus solitariusArea n. vagi Area n. hypoglossi vagus nucleus and nucleus gracilis. Lying immediately above the hypoglossal eminence is asecond and somewhat less pronounced elevation, formed by the nucleus funiculi teretis and meas-uring nearly 6 mm. in length by i mm. in breadth. Lateral to these two median elevations andlimited externally by the ala cinerea, lies a wedge-shaped field that is insinuated between thehypoglossal eminence and the vagal trigone. It .stretches from the acoustic stria- above to thenib of the calamus scriptorius below. This field, named the aria plumiformis by Retzius onaccount of its feather-like markings, is regarded by .Streeter as corresponding to a group of cells,the nucleus intercalatus, that occupies a superficial position in the ventricular floor and partl
Size: 1492px × 1674px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
