A manual of anatomy . t 8 mm. from the cor-neoscleral junction. The superior and inferior recti are insertedinto the vertical plane a little medial to the axis of the eyeball while 341 342 THE EYEBALL AND LACRIMAL APPARATUS the lateral and medial recti are inserted in the horizontal plane. Thesuperior oblique, a digastric muscle, arises a little above and medialto the ring and passes forward to the upper and inner angle of theorbit to pass through the pulley and then turns outward between thesuperior rectus and the eyeball to be inserted into the sclera betweenthe superior and lateral recti mu
A manual of anatomy . t 8 mm. from the cor-neoscleral junction. The superior and inferior recti are insertedinto the vertical plane a little medial to the axis of the eyeball while 341 342 THE EYEBALL AND LACRIMAL APPARATUS the lateral and medial recti are inserted in the horizontal plane. Thesuperior oblique, a digastric muscle, arises a little above and medialto the ring and passes forward to the upper and inner angle of theorbit to pass through the pulley and then turns outward between thesuperior rectus and the eyeball to be inserted into the sclera betweenthe superior and lateral recti muscle midway between the cornea andoptic nerve area, behind the equator of the eyeball. The inferior oblique arises at the front of the orbit just lateral tothe lacrimal fossa. It passes outward between the eyeball and thefloor of the orbit, then upward between the lateral rectus and theeyeball to be inserted into the sclera between the lateral and superiorrecti muscles, a little further back than the superior Fig. 252.—Muscles of the right orbit. The lateral and medial recti muscles move the eyeball horizontallyoutward and inward. The superior rectus moves the eyeball ver-tically upward when assisted by the inferior oblique, while the in-ferior rectus moves the eyeball vertically downward when assistedby the superior oblique. The inferior oblique rotates the eyeballlaterally, while the superior oblique rotates the eyeball medially. The orbital fat, usually considerable, serves as a cushion for theeyeball. It varies in quantity in different individuals and in healthand sickness. It fills in the orbital fossa around the eyeball and ismost abundant behind that organ. THE EYEBALL The eyeball {bulbus oculi) occupies the anterior portion of the orbitbeing protected by the orbital margins and the eyelids. The antero-posterior and the transverse diameters are 24 mm. while the verticaldiameter is mm. so that the eyeball is not quite a sphere at theequator. At birth the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthumananatomy, bookyea
