. Journal of anatomy. avingthe interior of the auditory capsule in the manner aforesaid, runs mediallyand opens into the subdural lymph space. Its interior is intersected withfine connective-tissue strands. Passing now to the cochlear segment of the pars cochlearis, we seeon its lateral surface (PI. G), from below upwards, first the prominentiacochlearis inferior, caused by the first turn of the cochlea. This is crossed The Primordial Cranium of Microtis amphihius (Water-Rat) 323 at right angles in its hinder part immediately below the foramen vestibuli(ovale) by a sulcus for the stapedial art
. Journal of anatomy. avingthe interior of the auditory capsule in the manner aforesaid, runs mediallyand opens into the subdural lymph space. Its interior is intersected withfine connective-tissue strands. Passing now to the cochlear segment of the pars cochlearis, we seeon its lateral surface (PI. G), from below upwards, first the prominentiacochlearis inferior, caused by the first turn of the cochlea. This is crossed The Primordial Cranium of Microtis amphihius (Water-Rat) 323 at right angles in its hinder part immediately below the foramen vestibuli(ovale) by a sulcus for the stapedial artery, which in Microtus is of verylarge size, larger in fact than the internal carotid. Above the promontoryand running downwards and forwards from the foramen vestibuli is asulcus, the sulcus septalis, which corresponds with the septum spirale Foramen caroticuni. Cochlear capsule. f^* Carotid Art. staped. Fen. cochleae. For. semic. post. N. vagus. Fossa siibarc. post. Vena jugul^Proniin. semic. (ariitid artery. - Crista parotica. Text-fig. 2.—Inferior aspect of riglit auditoiy capsule of Microtus, viewed from below. of the interior of the cochlea. Above this sulcus is the prominentia coch-learis superior, caused by the second turn of the cochlea. The upper surface of the cochlea (Pis. 5, 7) is comparatively small. Itis connected anteriorly with the processus alaris of the trabecular part ofthe central stem by the anterior trabeculo-cochlear commissure, lateral towhich lies a longitudinal sulcus which contains the great superficial petrosalnerve, and which broadens posteriorly to form the sulcus ganglion geniculi;more laterally there is a flattened area for the tensor tympani muscle (PI. 6).To the lateral side of this appears a well-marked band or ridge of dense 324 Professor Edward Fawcett fibrous tissue, which reaches outwards almost to the goniale, and most likelyrepresents the forerunner of the processus cochleariformis. The medial surface of the p
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
