The development of the human body; a manual of human embryology . ers belonging to this system are to be found inthe fifth, seventh, and tenth nerves, but in the mamma-lia their distribution has apparently become more limited,being confined almost exclusively to the trigeminus, ofwhose sensory divisions they form a very considerable the cells around which the fibers of the ascendingroot of the trigeminus terminate are the forward continua-tions of the posterior horns of the cord, it seems probablethat the fibers of this system are the cranial representa-tives of the posterior roots
The development of the human body; a manual of human embryology . ers belonging to this system are to be found inthe fifth, seventh, and tenth nerves, but in the mamma-lia their distribution has apparently become more limited,being confined almost exclusively to the trigeminus, ofwhose sensory divisions they form a very considerable the cells around which the fibers of the ascendingroot of the trigeminus terminate are the forward continua-tions of the posterior horns of the cord, it seems probablethat the fibers of this system are the cranial representa-tives of the posterior roots of the spinal nerves, which,it may be noted, are also somatic in their]distribution. 436 THE DEVELOPMENT OF THE HUMAN BODY. The fibers of the viscerosensory system are found in thelower forms principally in the ninth and tenth nerves (seeFig. 231), although groups of them are also incorpor-ated in the seventh and fifth. They converge to a massof cells, known as the lobus vagi, and like the first setare also continued down the medulla to form a tract rL&L cc. rix Fig. 231.—Diagram showing the Sensory Components of the CranialNerves op a Fish (Menidia). The somatic sensory system is unshaded, the viseero-sensory is cross-hatched, and the lateral line system is black, , Ascending rootof trigeminus; brx, branchial branches of vagus; ol, olfactory bulb;op, optic nerve; , cutaneous branch of the vagus; rix, intestinalbranch of vagus; rl, lateral line nerve; , accessory lateral linenerve; ros, superficial ophthalmic; rp, ramus palatinus of the facial;thy, hyomandibular branch of the facial; , infraorbital nerve.—(Herrick.) known as the fasciculus solitarius or fasciculus the mammalia the system is represented by the sensoryfibers of the glossopharyngeo-vagus set of nerves, of whichit represents practically the entire mass; by the sensoryfibers of the facial arising from the geniculate ganglion andincluded in the chorda tympani and probably also the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
