By Mohammad Wakeel Ansari, Ahmed Nadeem
This booklet is a realistic and concise atlas on ocular anatomy, with an emphasis on utilized facets and tricks for simple retention suggestions. The significant colour illustrations and images include self-explanatory, particular, and significant representations of the issues coated within the textual content. protecting chapters resembling bony socket of the attention, extraocular muscular tissues, eyelids, cornea and lens, and neurology of the attention, Atlas of Ocular Anatomy supplies a precis of the real and appropriate issues for every subject, keeping apart out the fundamental from the nonessential components. whole with consultant schematic line diagrams and entire colour pictures, this atlas good points the correlation among anatomic evidence with their possible medical shows in illness.
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Extra info for Atlas of Ocular Anatomy
1 shows that the superior rectus muscle arises from the upper part of the annulus of Zinn above and lateral to the optic foramen and also from the neighboring sheath of the optic nerve. On the one hand, this origin lies in the angle formed by the splitting of the dura that lines the optic canal to form the orbital periosteum (periorbita), and on the other hand it lies in the dural covering of the nerve. It is below the levator muscle and is continuous on the medial side with the medial rectus and on the lateral with 42 4 Extraocular and Intraocular Muscles Equator Roof of orbit Trochlea Medial rectus Bend of superior oblique by 51˚ Superior rectus Insertion of superior oblique Apex of orbit Annulus of Zinn Inferior rectus Lateral rectus Inferior oblique Floor Fig.
2, p. 21). It has the form of a right-angled triangle; the right angle is internal and faces the ciliary processes. The posterior angle is acute and points to the choroid, and the hypotenuse runs parallel to the sclera. This 51 muscle has three types of ﬁbers externally: outermost is the longitudinal, the intermediate oblique or radial, and the innermost circular or sphincteric. The longitudinal ﬁbers have their origin in the scleral spur and the adjacent trabeculae. They can be traced posteriorly to the suprachoroid lamina.
R. O. – Left superior oblique ocular movements, with the constant feedback of vision to correct any departures leading toward diplopia. Thus the medial, superior, and inferior recti act as an adductor group, their abductor opponents being the lateral rectus and both oblique muscles. An example of synergists follows. On looking up and to the right, the right superior rectus and left inferior oblique muscles are primarily involved. The corresponding groups are shown in Fig. 7. 2 show that the superior oblique muscle, the longest and thinnest muscle, arises above and medial to the optic foramen by a narrow tendon that partially overlaps the origin of the levator muscle.