Text-book of ophthalmology . .303, which represents the anterior halfof the eyeball projected upon a plane. Init are marked the distances of the lines ofinsertion from the cornea in millimeters,as I have found them from the mean of agreat number of measurements. The muscles are surrounded by fascicewhich are continuous anteriorly with Ten-ons capsule at the spot where the latteris reflected upon the tendons of the mus-cles. Lateral prolongations of the fascia)unite the muscles together, and also passfrom them to the bony wall of the means of this system of fascia per-vading the orbit,
Text-book of ophthalmology . .303, which represents the anterior halfof the eyeball projected upon a plane. Init are marked the distances of the lines ofinsertion from the cornea in millimeters,as I have found them from the mean of agreat number of measurements. The muscles are surrounded by fascicewhich are continuous anteriorly with Ten-ons capsule at the spot where the latteris reflected upon the tendons of the mus-cles. Lateral prolongations of the fascia)unite the muscles together, and also passfrom them to the bony wall of the means of this system of fascia per-vading the orbit, the contents of thelatter are fixed in place. It is owing to them that the eye does not leaveits place when performing its movements, but turns about a fixed center. Thecontinuations of the fasciae, passing from the muscles to the walls of the orbit, act asa Borl of restraining apparatus [check ligaments] which prevent extreme excursionsof the eyeball (Merkel, Motais). They are most strongly developed upon the internal Rexl. Rwb Ruif. Fio. 303.—Lines of Insertion of the FourRecti Muscles projected upon a Plane. Natural size. DISTURBANCES OF MOTILITY OF THE EYE 715 and external recti (fi and fe, Fig. 284). [The superior oblique has two check ligaments,one attached to the direct, the other to the reflected portion of the tendon. The inferioroblique has no check ligament, its place being taken by the ligament attached to thereflected tendon of the superior oblique.—D.] The levator palpebral superioris, too,which is associated in action with the superior rectus, is united to it directly by bandsof fascia [See page 656. The inferior rectus is similarly connected with the inferiorobliquel. Furthermore, bands of fascia pass from the levator to the skin of the upperlid and also to the upper retrotarsal fold, so that these structures follow the movementsof the eyeball and the upper lid when these are elevated. An analogous apparatuscomes into play when the eyeball is depressed, ban
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