This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1851 Excerpt: ...division of the fifth, which descends between the two pterygoid muscles, these are the only important cerebral nerves that emerge from the base of the skull. It is true that the spinal accessory passes outwards, sometimes in front of the jugular vein, and enters the upper third of the sterno mastoid, but then it is ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1851 Excerpt: ...division of the fifth, which descends between the two pterygoid muscles, these are the only important cerebral nerves that emerge from the base of the skull. It is true that the spinal accessory passes outwards, sometimes in front of the jugular vein, and enters the upper third of the sterno mastoid, but then it is distributed merely to the trapezius, and is only a motor nerve. Of course, there is also the portio dura emerging from the stylo mastoid foramen, and curving forward through the parotid gland to form the pes anserinus on the surface of the external carotid artery, subsequently dividing into temporo-facial and cervico-facial, for the supply ot the muscles of expression, which are indeed all belonging to the face, except those of mastication. But then this nerve is purely motor, and cannot compare in importance with the pneumogastric or the fifth. But to return. A little way from the base of the skull the vein changes its position with regard to the internal carotid, and gets behind it. A glance at the base of the skull will explain the reason of this change; the carotid foramen will be found exactly in front of the jugular; a minute perforation will be observed in the plate that divides them, and this transmits the tympanic nerve of Jacobson, derived from the glosso-pharyngeal nerve, and spreading out into a plexus on the inner-wall of the tympanum. As the sheath ol the vessels rests on the rectus anticus major, the superior cervical ganglion of the great sympathetic lies between it and the muscle opposite the second and third cervical vertebrae; and just as the carotid is about to enter its foramen, the two branches from this ganglion which enter the skull form a net-work around it, called the carotid plexus, which, as the artery passes through t...
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