. Anatomy, descriptive and applied. Anatomy. 884 THE NERVE SYSTEM dorsolateral part of the pontile tegmentum, dorsomesad of the sensor nucleus; (b) a small, slender, so-called mesencephalic root nucleus (nucleus radicis asceiid- entis nervi trigemini) extending cephalad of the region of the locus coeruleus»to lie along the aqueduct in the mid-brain. The fibres from the principal nucleus supply the muscles of mastication. The distribution of the fibres from the mesen- cephalic root is not precisely known. Kolliker suggests that they may supply the Tensor veli palatini, Tensor tympani. Mylohyoid
. Anatomy, descriptive and applied. Anatomy. 884 THE NERVE SYSTEM dorsolateral part of the pontile tegmentum, dorsomesad of the sensor nucleus; (b) a small, slender, so-called mesencephalic root nucleus (nucleus radicis asceiid- entis nervi trigemini) extending cephalad of the region of the locus coeruleus»to lie along the aqueduct in the mid-brain. The fibres from the principal nucleus supply the muscles of mastication. The distribution of the fibres from the mesen- cephalic root is not precisely known. Kolliker suggests that they may supply the Tensor veli palatini, Tensor tympani. Mylohyoid, and anterior belly of the Digastric. Like other motor nuclei, these efferent divisions of the trigeminus are under the dominion of the cerebral cortex via pyramidal fibres. The Cerebellum.—The cerebellum occupies the greater part of the posterior fossa or cerebellar part of the skull, and is the largest portion of the hind-brain. It is overlapped by the occipital poles of the cerebrum, being separated from these by the tentorium. It lies dorsad of the pons oblongata and partly embraces this portion of the brain stem. It is composed of a white central core with scattered gray masses and a surface layer of gray substance that is of darker hue than the cerebral cortex. Ala lobuli centralis. I centralis. > Great horizontal 'Jissure. Pre-clival fissure. clival ]. Fig. —Upper surface of the cerebellum. (Schiifer.) The cerebellum is convoluted on a plan entirely different from that of the cere- brum. Each primary fold is folded by secondary and these in turn by tertiary folds, so that on sagittal section a cypress-leaf appearance is noted, the arbor vitae cerebelli. The interior or medullary white substance follows all these branchings and sub-branchings, forming a skeleton of the minute folds which are called folia. These folia are demarcated on the surface by numerous curved and more or less parallel fissures of various depths. The cerebellum is connected to the brain
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
