Archive image from page 425 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 414 THE CRANIAL NERVES horn of the cord, it seems probable that the fibers of this system are the cranial representatives of the posterior roots of the spinal nerves, which, it may be noted, are also somatic in their distribution. The fibers of the viscero-sensory system are found in the lower forms principally in the ninth and tenth nerves (see Fig. 247), although groups of them are also incorporated in the seventh and fifth. They c
Archive image from page 425 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 414 THE CRANIAL NERVES horn of the cord, it seems probable that the fibers of this system are the cranial representatives of the posterior roots of the spinal nerves, which, it may be noted, are also somatic in their distribution. The fibers of the viscero-sensory system are found in the lower forms principally in the ninth and tenth nerves (see Fig. 247), although groups of them are also incorporated in the seventh and fifth. They converge to a mass of cells, known as the lobus vagi, and like the first set are also continued down the medulla to form rix Fig. 247.—Diagrams showing the Sensory Components of the Cranial Nerves of a Fish (Menidia). The somatic sensory system is unshaded, the viscero-sensory is cross-hatched, and the lateral line system is black, , Spinal root of trigeminus; brx, branchial branches of vagus; Ix, lobus vagi; ol, olfactory bulb; op, optic nerve; , cutaneous branch of the vagus; rix, intestinal branch of vagus; rl, lateral line nerve; , accessory lateral line nerve; ros, superficial ophthalmic; rp, ramus palatinus of the facial; thy, hyomandib- ular branch of the facial; , infraorbital nerve.—{Herrick.) a tract known as the fasciculus solitarius or: fasciculus communis. In the mammalia the system is represented by the sensory fibers of the glosso-pharyngeo-vagus set of nerves, of which it represents prac- tically the entire mass; by the sensory fibers of the facial arising from the geniculate ganglion and included in the chorda tympani and probably also the great superficial petrosal; and also, probably, by
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