. Cunningham's Text-book of anatomy. Anatomy. 506 THE NERVOUS SYSTEM. the somatic efferent nucleus. Then there is a group of small multipolar cells, the axons of which pass out into sympathetic ganglia, and indirectly control the involuntary unstriped muscles and other active parts of viscera. These cells form the splanchnic efferent nucleus. In the upper cervical and lower cranial region a portion of the somatic efferent nucleus is set apart to innervate the striped muscles developed in the branchial arches. This is the lateral somatic or intermediate efferent nucleus. Many recent writers are
. Cunningham's Text-book of anatomy. Anatomy. 506 THE NERVOUS SYSTEM. the somatic efferent nucleus. Then there is a group of small multipolar cells, the axons of which pass out into sympathetic ganglia, and indirectly control the involuntary unstriped muscles and other active parts of viscera. These cells form the splanchnic efferent nucleus. In the upper cervical and lower cranial region a portion of the somatic efferent nucleus is set apart to innervate the striped muscles developed in the branchial arches. This is the lateral somatic or intermediate efferent nucleus. Many recent writers are of the opinion that this nucleus is splanchnic: but its fibres directly innervate striped voluntary muscles, which are developed from the same material ROOF-PLATE Splanchnic Terminal Nucleus * Gustatory Nucleus. Acoustico -Lateral Terminal Nucleus. Somatic Terminal Nucleus. H-Wi--- Ear LAMINA] BASALISj Somatic ----/fv-f Efferent Nucleus/ -Sensory Ganglion. 'Skin. Unstriped Muscle Visce Mucous Membrane Fig. 446.—Diagram of a Transverse Section through the Right Half of the Fcetal Rhomben- cephalon and Epithelial Areas associated with it to illustrate the Different Categories of Nerve Components and their Central Nuclei. (myotomes) from which the other striped muscles are formed (Agar and Graham Kerr). The alar lamina also can be subdivided into a series of functional areas (Fig. 446). At the dorsal edge is the somatic afferent terminal nucleus, which receives im- pulses coming from the skin. In one region a part of this nucleus is specialised for the reception of impulses coming from the internal ear (acoustico-lateral terminal nucleus). Then there is a group of cells collected around the incoming visceral sensory nerves—the splanchnic afferent terminal nucleus. A part of this is specialised to receive taste impressions—the gustatory nucleus—but this has not yet been clearly demarcated from the rest of the nucleus. This analysis of the various functional eleme
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