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Eye Anatomy
| Question | Answer |
|---|---|
| Mucous membrane lining the inner surface of the eyelids and covering the surface of the eye | Conjunctivia |
| Located in the lateral aspect of the roof of the orbit, superior and inferior parts | Lacrimal Gland |
| Part of the eye where secretions from this gland pass through 6-12 ducts which open onto the conjunctiva | Lacrimal Gland |
| Small openings into superior and inferior lacrimal canaliculi | Superior and Inferior Lacrimal Puncta |
| Small tubular ducts leading to lacrimal sac | Superior and Inferior Lacrimal Canaliculi |
| Enlarged cavity located in fossa for lacrimal sac | Lacrimal Sac |
| Duct running from lacrimal sac and opening into nasal cavity | Nasolacrimal Duct |
| Small reddish conical body of skin containing sebaceous and sweat glands | Lacrimal Caruncula |
| Source of whitish secretion that collects in this area | Lacrimal Caruncula |
| A semilunar fold of conjunctiva | Plica Semilunaris |
| A triangular space at the medial angle of eye where tears collect | Lacrimal Lake |
| Route of Tears | Lacrimal Gland, Lacrimal Lake, Lacrimal Puncta, Lacrimal Canaliculi, Lacrimal Sac, Nasolacrimal Duct, Nasal Cavity |
| Outer layer of eyeball | Sclera |
| Middle layer of eyeball | Choroid |
| Inner layer of eyeball | Retina |
| Contains axons leading from the retina to brain | Optic Nerve |
| Retina contains what | rod and cone receptors |
| Outer surface of the optic nerve is covered by what? | Dura |
| Point of exit for fibers forming optic nerve | Optic Disk |
| Lacks rod and cone receptors, thus insensitive to light (blind spot) | Optic Disk |
| Yellow spot about half a millimeter in diameter consisting only of cone receptors | Macula Lutea |
| Center of macula is a small pit | Fovea Centralis |
| Point of critical vision (sharp focus) | Macula Lutea |
| Situated between the iris and the vitreous body | Lens |
| What acts to focus light on the retina? | Lens |
| Act to suspend the lens via attachment to the ciliary body | Suspensory Ligaments |
| Contains the ciliary muscle | Ciliary Body |
| Watery fluid secreted by the ciliary body and contained within the anterior and posterior chambers of the eye | Aqueous Humor |
| Transparent semigelatinous substance filling the vitreous chamber | Vitreous Body |
| Colored part of the eye just anterior to the lens and surrounds the pupil | Iris |
| 2 parts of the Iris | constrictor/sphincter pupillae and dilator pupillae |
| Inner circular layer of smooth muscle of the Iris | constrictor/sphincter pupillae |
| Outer radiating layer of smooth muscle of the Iris | dilator pupillae |
| What reduces pupil diameter (to bright light)? | constrictor/sphincter pupillae |
| what increase pupil diameter (low light)? | dilator pupillae |
| Opening for entrance of light into the eye | Pupil |
| Clear, transparent extension of sclera over anterior 1/6 of eye | Cornea |
| Between iris and lens | Posterior Chamber |
| Between iris and cornea | Anterior Chamber |
| Posterior to lens containing the vitreous body | Vitreous Chamber |
| Minute small cavities at junction of iris and cornea - Drains aqueous humor from the anterior chamber | Trabeculae |
| Drains aqueous humor from the trabeculae and delivers it to small veins in the immediate area | Scleral Venous Sinus (Canal of Schlemm) |
| Route of Aqueous Humor | Ciliary body, posterior chamber, pupil, anterior chamber, trabeculae, scleral venous sinus, vein |
| Raises upper eyelid | Levator Palpebrae Superioris |
| Four Recti Muscles | Superior Rectus, Inferior Rectus, Medial Rectus and Lateral Rectus |
| Elevates and Adducts Eye | Superior Rectus |
| Depresses and Adducts Eye | Inferior Rectus |
| Adducts Eye | Medial Rectus |
| Abducts Eye | Lateral Rectus |
| Two Oblique Muscles of the Eye | Superior Oblique and Inferior Oblique |
| Action of the Superior Oblique Muscle | Depresses and Abducts |
| Action of the Inferior Oblique Muscle | Elevates and Abducts |