. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. CEREBRAL NERVES 243 maxillary branch of the trigeminal and which innervates the mucous membrane of the pharynx, and (b) chorda tympani,1 going to the mucous membrane of the floor of the pharynx. These two nerves correspond to the " portio intermedia" of the facial of Mammals (Fig. 182), and are closely related at their origin with the geniculate ganglion. The chorda tympani corresponds to the. /'. -1,11,1 VII in nil. FIG. 182.—DIAGRAM SHOWING THE RELATIONS OF THE PORTIO INTERMEDIA OP THE FACIAL NERVE IN MAX. (Af
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. CEREBRAL NERVES 243 maxillary branch of the trigeminal and which innervates the mucous membrane of the pharynx, and (b) chorda tympani,1 going to the mucous membrane of the floor of the pharynx. These two nerves correspond to the " portio intermedia" of the facial of Mammals (Fig. 182), and are closely related at their origin with the geniculate ganglion. The chorda tympani corresponds to the. /'. -1,11,1 VII in nil. FIG. 182.—DIAGRAM SHOWING THE RELATIONS OF THE PORTIO INTERMEDIA OP THE FACIAL NERVE IN MAX. (After A. F. Dixon ; slightly modified.) I, II, III, the three branches of the trigeminal ; *, geniculate ganglion of the facial ; t, sphenopalatine ganglion, in the neighbourhood of //; , chorda tympani; , tympanic cavity, outlined; G'. ti-iij, (iasserian ganglion of the trigeminal ; , intermediate (sensory) portion of the facial; P. mot. VII, motor portion of the facial (hyomandibular); , lingual branch of///; Jl. ma ml, mandibular branch of ///; , palatine (greater superficial petrosal) branch of facial. The motor portion of trigeminal /// is not indicated. prebranchial and the hyomandibular to the postbranchial branch, but from Amphibians onwards the chorda tympani becomes post- spiracular in position. III. A main post-spiracular hyomandibular trunk, extending along the hyoid arch, and essentially motor, except for the com- ponents which give rise to the sensory external mandibular and a few twigs supplying the mucous membrane of the spiracle, 1 The chorda tympani ("alveolar" branch of the facial) passes internally to the lower jaw in Elasmobranchii, Ganoidei, Perennibranehiata, and Anura. In other Amphibians, as in Reptiles, it passes into the bony lower Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations
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