. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. small openings in a plate ofthe ethmoid bone. (This plate is called crihri-form, fromits resemblance to a sieve.) This nerve ramifies upon themembrane that lines the nasal passages. It is the softesVnerve of the body. 743. The optic nerve (second pair) passes from the inte-rior of the cranium, through an opening in the base of theskull, {fo-ramen opti-cum,) to the cavity for the eye. Itpierces the coats of the eye, and expands in the retina. 744. The motores oculorum (third pair) pass from the 739.
. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. small openings in a plate ofthe ethmoid bone. (This plate is called crihri-form, fromits resemblance to a sieve.) This nerve ramifies upon themembrane that lines the nasal passages. It is the softesVnerve of the body. 743. The optic nerve (second pair) passes from the inte-rior of the cranium, through an opening in the base of theskull, {fo-ramen opti-cum,) to the cavity for the eye. Itpierces the coats of the eye, and expands in the retina. 744. The motores oculorum (third pair) pass from the 739. Describe the arachnoid membrane. 740. WTiat is said respectingthe pia mater ? 741. How many pairs of crania nerves ? Name Describe the olfactory nerve. 743. The optx nerve. 744. Describe theaiotores oculorum. 336 ANATOMY, PHYSIOLOGY, AND HYGIENE brain, through an opening of the sphenoid bone, {sphe-noidalfissure,) to the muscles of the eye. 745. The patheticus (fourth pair) peisses from the brain,through the sphenoidal fissure, to the superior oblique muscleof the eye. Fisr. Fig. 125. The distribution of the third, fourth, and sixth paira of nerves, to themuscles of the eye. 1, The ball of the eye and rectus externus muscle. 2, The up-per jaw. 3, The third pair, distributed to all the muscles of the eye, except thesuperior oblique, and external rectus. 4, TJie fourth pair passes to the superioroblique muscle. 6, The sixth pair, is distributed to the external rectus muscle. 746. The trifacial nerve (fifth pair) is analogous to thespinal nerves in its origin by two roots, from the anteriorand posterior columns of the spinal cord. It has a ganglion,like the spinal nerves upon its posterior root. For thesereasons, it ranges with the spinal nerves, and is consideredthe cranial spinal nerve. This nerve divides into threebranches : — The oph-thalmic^ superior maxil-Ia-ri/, aYid in-ferior maxil-la-ry, 745. The patheticus. What does fig. 12-5 represent ? 746. What is
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