. Anatomy, descriptive and applied. Anatomy. 370 THE MUSCLES AND FASCIA Relations.—By its orbital surface, with the frontal nerve and supraorbital artery, the peri- osteum of the orbit and lacrimal gland; and, in the lid, with the inner surface of the tarsal liga- ment; bv its ocular surface, with the Superior rectus, and, in the lid, with the conjunctiva. A small branch of the oculomotor nerve enters its under surface. The four Recti (Fig. 292) arise from a fibrous ring {annulus tendineus comvninis) [Zinn] which surrounds the upper, inner, and lower margins of the optic foramen and encircles
. Anatomy, descriptive and applied. Anatomy. 370 THE MUSCLES AND FASCIA Relations.—By its orbital surface, with the frontal nerve and supraorbital artery, the peri- osteum of the orbit and lacrimal gland; and, in the lid, with the inner surface of the tarsal liga- ment; bv its ocular surface, with the Superior rectus, and, in the lid, with the conjunctiva. A small branch of the oculomotor nerve enters its under surface. The four Recti (Fig. 292) arise from a fibrous ring {annulus tendineus comvninis) [Zinn] which surrounds the upper, inner, and lower margins of the optic foramen and encircles the optic nerve. Two specialized parts of this ring may be made out: (1) A lower, ligament of Ziim, which gives origin to the Inferior rectus, part of the Internal rectus, and the lower head of the External rectus; and (2) an ujjper, the tendon of Lockwood, which gives origin to the Superior rectus, the rest of the Internal rectus, and the upper head of the External rectus. Each of the four Recti passes forward in the position implied by its name, to be inserted by a tendinous expansion into the sclera, about a quarter of an inch from the margin of the cornea. Between the two heads of the External rectus is a narrow interval, through which pass the two divisions of the oculomotor nerve, the nasal Reciu,s,.p<Tior brauch of the ophthalmic division of the tri- ^wsuperiorJ j— geminal nerve, the abducent nerve, and the Superior oblique} I'<s^*%s^^ ophthalmic vein. Of the four Recti, the Internal rectus is the broadest, the External the longest, and the Superior the thinnest and narrowest. Beyond the insertion of the Inferior rectus a thin layer of non-striated muscle fibres (inferior tarsal muscle) continues into the lower eyelid to be inserted into the inferior tarsal plate. Fig. 292.—The relative position and attach- rpi £!„„,-_;„?« ...l^K^iin / IT T ment of the muscles o£ the left eyebaU. i he bUpePlOr ODliqUe (?«.. obhquVS OCUU superior) is a fusiform muscl
Size: 2252px × 1110px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
