. Physiology and animal mechanism : first-book of natural history, prepared for the use of schools and colleges. t. e. the Eustachian tube.—f. o. foramenovale.—v. the vestibule,—I the cochlea.—o. s. c. the semicircular canals—these canals and the cochlea constitute the labyrinth or internal ear.—n. a-the auditory or acaustic nerve.—r. the petrous bone, that is a part of thetemporal bone which derives its name from a Greek word signifying, rocky,which has been applied to it from its very remarkable hardness.—c, cells inthe temporal bone.—-/. g. glenoid cavity for the articulation of the lowerja
. Physiology and animal mechanism : first-book of natural history, prepared for the use of schools and colleges. t. e. the Eustachian tube.—f. o. foramenovale.—v. the vestibule,—I the cochlea.—o. s. c. the semicircular canals—these canals and the cochlea constitute the labyrinth or internal ear.—n. a-the auditory or acaustic nerve.—r. the petrous bone, that is a part of thetemporal bone which derives its name from a Greek word signifying, rocky,which has been applied to it from its very remarkable hardness.—c, cells inthe temporal bone.—-/. g. glenoid cavity for the articulation of the lowerjaw.—a. m. mastoid apophysis or mastoid process of the temporal bone. Fig. 5. The tympanum with the bones of the ear.—t. the tympanum.—m, a the maleus or hammer.—m. the handle of the maleUs which rests uponthe tympanum.—m. m. muscle of the maleus.—en, the incus or anvil.—eUthe stapes or stirrup.—me. muscle of the stapes. Fig. 6. Bones of the ear separated.—m. the maleus.—en. the incus.—Uthe os lenticulare or lenticular bone, or orbicular bone.—st. the stapes. Plate Nervous System—Organs of Sense, EXPLANATION OF PLATE 5. Fig- 1. The nervous system.—c. the cerebrum.—cv. the cerebellum.—m. e. the spinal marrow from which arises a great many nerves whichramify over all parts of the body.—pb. the brachial plexus or reunion or as-semblage of the different neives which are distributed to the arms.—p. s-the sciatic plexus or of assemblage of nerves which form the great sciaticnerve which descends to the lower extremities. Fig. 2. A portion of the spinal marrow to show the manner in which thenerves arise by two sets or bundles of roots, —r. anterior roots serving formotion.—r. p. posterior roots serving for sensibility.—g. ganglionic swellingof a posterior root. Fig. 3. An open eye.—s. the sclerotica, one part of which is turned back—ch. the choroid.—r. the retina.—c. t. the transparent cornea.—c. a. theanterior cha
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