Dissection of left orbit from a lateral approach

General view of orbit, eye and optic pathway to lateral geniculate body

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Image #56-5

Dissection of left orbit from a lateral approach General view of orbit, eye and optic pathway to lateral geniculate body The eye has been sectioned in a sagittal plane and the sheath of the optic nerve cut away. The optic nerve (7) and the opthalmic artery(10) are visible passing through the optic canal which has been opened by removal of the anterior clinoid process. The sphenoid sinus extended into this process and has been cut open inferior to the opthalmic artery. The dissection of areas in the lower part of the view is shown in detail elsewhere. 1 . Falx cerebri 2 . Optic chiasm 3 . Sphenoidal border 4 . Olfactory tracts 5 . Upper pointer: Levator palpebrae superioris muscle Lower pointer: Superior rectus muscle 6 . Supraorbital margin (cut across) 7 . Upper pointer: Medial rectus muscle Lower pointer: Optic nerve (II) 8 . Upper pointer: Sclera (internal surface) Lower pointer: Cornea (somewhat distorted) 9 . Crystalline lens 10 . Ophthalmic artery 11 . Upper pointer: Inferior rectus muscle Lower pointer: Inferior oblique muscle (cut off) 12 . Infraorbital nerve 13 . Maxillary sinus (opened) 14 . Internal carotid artery right 15 . Third ventricle (opened) 16 . Inferior colliculus 17 . Lateral geniculate body 18 . Optic tract 19 . Oculomotor nerve (III) 20 . Internal carotid artery left 21 . Semilunar ganglion (trigeminal) 22 . Abducens nerve (VI) 23 . Major superficial petrosal nerve 24 . Sphenoid sinus (opened) 25 . Sphenopalatine ganglion 26 . Upper pointer: Auditory tube (Eustachian) (opened) Lower pointer: Levator veli palatini muscle 27 . Internal maxillary artery (pterygopalatine portion, cut off) 28 . Facial nerve emerging from stylomastoid foramen