sphenoid bone वाक्य
उदाहरण वाक्य
मोबाइल
- The ligament allows for a change of the functional origin of the levator palpebrae superioris muscle, enabling the superior tarsus ( eyelid ) to be elevated superiorly rather than directly toward the muscle's origin on the sphenoid bone . attaches medially to the pulley of superior oblique muscle Trochlea of superior oblique and laterally to the lacrimal gland 10mm above Whitnall tubercle.
- In the sphenoid bone, the anterior boundary of the sella turcica is completed by two small eminences, one on either side, called the middle clinoid processes, while the posterior boundary is formed by a square-shaped plate of bone, the dorsum sellae, ending at its superior angles in two tubercles, the posterior clinoid processes, the size and form of which vary considerably in different individuals.
- It is bounded in front by the posterior margins of the lesser wings of the sphenoid bone, the anterior clinoid processes, and the ridge forming the anterior margin of the chiasmatic groove; behind, by the superior angles of the petrous portions of the temporal bones and the dorsum sell? laterally by the temporal squam? sphenoidal angles of the parietals, and greater wings of the sphenoid.
- The sphenoidal conchae are each developed from a center that makes its appearance about the fifth month; at birth they consist of small triangular laminae, and it is not until the third year that they become hollowed out and coneshaped; about the fourth year they fuse with the labyrinths of the ethmoid bone, and between the ninth and twelfth years they unite with the sphenoid bone.
- The superior surface of the sphenoid bone is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the chiasmatic groove ( optic groove ), above and behind which lies the optic chiasma; the groove ends on either side in the optic foramen, which transmits the optic nerve and ophthalmic artery ( with accompanying sympathetic nerve fibres ) into the orbital cavity.
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