. Surgery, its principles and practice . mm. fromthe corneal margin,within the positionof the external rec-tus. It is suppliedby the largestbranch of the supe-rior division of the third or oculomotor nerve. Its pre-eminent action is extorsion—that is, it rotates the vertical meridian outward. It also elevates the eye and ab-ducts it. The levator palpebrse superioris arises from the under surface of the lesser wingof the sphenoid bone above the optic foramen. The muscle passes above the su-perior rectus and terminates in a broad, thin tendon or aponeurosis, which is insertedinto the upper borde
. Surgery, its principles and practice . mm. fromthe corneal margin,within the positionof the external rec-tus. It is suppliedby the largestbranch of the supe-rior division of the third or oculomotor nerve. Its pre-eminent action is extorsion—that is, it rotates the vertical meridian outward. It also elevates the eye and ab-ducts it. The levator palpebrse superioris arises from the under surface of the lesser wingof the sphenoid bone above the optic foramen. The muscle passes above the su-perior rectus and terminates in a broad, thin tendon or aponeurosis, which is insertedinto the upper border of the superior tarsus. It is supplied by the third or oculo-motor nerve (Fig. 453). The lachrymal gland lies in a depression in the orbital plate of thefrontal bone near the front of the outer part of the roof (see also page860). The Eyeball.—The eyeball is a spheroid body which occupies theanterior part of the orbit. Its anterior posterior diameter is approx-imately 25 mm., and this measurement is to be remembered in connection. Fig. 453.—Ocular Muscles Viewed after Removal of of Orbit (Testut).a, Eyeball; 6, optic nerve; c, c, eyelids; d, maxillary sinus; e,pterygoid plate; /, foramen rotundum; g, roof of orbit; h, frontal sinus;i, supraorbital nerve; A-, septum orbitale; 1, levator palpebrse superioris;2, 3, superior and inferior recti; 4, 4, portions of the cut external rectus;.5, internal rectus; 6, inferior oblique; 7, insertion of superior oblique;8, annular ligament or tendon of Zinn. ANATOMIC CONSIDERATIONS. 853 with the locahzation by means of the x-rays of foreign bodies containedwithin its coats. The globe is so situated that a line drawn from theupper to the lower orbital margin just touches the cornea, an importantfact in estimating the degree of protrusion of the eyeball (proptosis,exophthalmos) which may occur under various pathologic conditions,as well as the degree of sinking in of the eyeball (enophthalmos). Theback part of the eyeball i
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