. The science and practice of dental surgery. Fig. 17.—Schematic section of a visceral arch (afterKeith). CM, Cleft membrane; E, Ectoderm; H, Entoderm;N, A, V, Nervous, arterial, and venous supply of avisceral arch; M, Muscle; C, Cartilage. Theremainder of the mesoderm develops into theconnective tissues. behind the auditory tube), the piriform fossa,and rudiments of the thymus and thyreoidglands. During the fourth week the membranouscranium undergoes a cartilaginous stage, \\hich. 1, Fig. 18.—Showing the destination of the cartilaginousvisceral arches (after Keith).2, 3, 4, 5, The five viscer
. The science and practice of dental surgery. Fig. 17.—Schematic section of a visceral arch (afterKeith). CM, Cleft membrane; E, Ectoderm; H, Entoderm;N, A, V, Nervous, arterial, and venous supply of avisceral arch; M, Muscle; C, Cartilage. Theremainder of the mesoderm develops into theconnective tissues. behind the auditory tube), the piriform fossa,and rudiments of the thymus and thyreoidglands. During the fourth week the membranouscranium undergoes a cartilaginous stage, \\hich. 1, Fig. 18.—Showing the destination of the cartilaginousvisceral arches (after Keith).2, 3, 4, 5, The five visceral arches; MC, MeckelsCartilage; M, Malleus; In., Incus; S, Stapes(tympano-hyal); SP, Stylo-hyoid process (stylo-hyal); SHL, Stylo-hyoid ligament (epi-hyal);LCH, Lesser cornu of hyoid bone (cerato-hyalj; B,and GCH, Body and greater cornu of hyoid Ijone(thyreo-hyal); Th., Thyreoid cartilage formed bythe fourth and fifth arches; T, Tongue; TR, Tym-panic ring. is imperfect in the head of the skeleton of manand the higher vertebrates. Cartilaginous cover-ings are provided for the organs of smell, sight,and hearing (see Fig. 20), and a cartilaginousvisceral skeleton delineates the mandible, the bones of the middle ear, the styloid process,and the hyoid bone (see Figs. 21, 22). Animperfect cartilaginous capside is formed aroundthe base of the brain, but the vault remainsmembranous (see Fig. 23).
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
