A) sclera B) cornea C) retina D) iris. e. Sclera. It originates near the nose. sclera may play a major role in ocular disease and pathology [2]. B) retina. The sclera is made up of three divisions: the episclera, loose connective tissue, immediately beneath the conjunctiva; sclera proper, the dense white tissue that gives the area its color; and the lamina fusca, the innermost zone made up of elastic fibers. So, the correct answer is 'Cornea'. The sclera is the "white of the eye". Located behind the cornea is the pupil, the part of the eye through which light can enter the interior of the eye. E) pupil. The _____ is the anterior transparent portion of the eyeball. The junction of the cornea and the sclera is called the limbus. The transparent anterior portion of sclera is. Ultrastructural studies show that developmental events of the sclera begin in the region anterior to the equator at approximately day 43. It is the first part of the eye to refract, or bend, light rays. 0 votes. It is the largest portion of the uveal tract. The cornea is the anterior, transparent portion of the outer coat. The orbicularis…, Combined with the cardiovascular system, the circulatory system helps to fight off disease, helps the body maintain a normal body temperature, and…, Humans are sexual, meaning that both a male and a female are needed to reproduce. Upper eyelid. Becomes continuous w/dura mater that surrounds the optic nerve. It is the second of several pairs…, The orbicularis oculi muscle is one of the two major components that form the core of the eyelid, the other being the tarsal plate. The average thickness of the bulbar conjuntival membrane is 33 microns. The transparent anterior portion of the sclera is the iris retina cornea from BIO 101 at Darton State College It’s connected to muscles that help the eye move. Acquired abnormalities of the sclera include: Episcleritis: a hypersensitivity reaction which can be anterior or posterior, is characterized by engorged blood vessels, and can also affect the cornea, Last medically reviewed on January 19, 2018, The superior oblique is a fusiform (spindle-shaped) muscle belonging to the extraocular group of muscles. The posterior portion of the uvea is the choroid, which is a highly vascular tissue just posterior to the retina. True The structure that is posterior to the iris and is a colorless structure that allow the eye to … Healthline Media does not provide medical advice, diagnosis, or treatment. sclera: transparent anterior part of the sclera in front of the aqueous humor and lies over the iris: cornea: middle layer of the eye: choroid: pigmented muscular structure that allows light to pass through: iris: opening in the center of the iris: pupil: lies directly behind the pupil - it focuses and bends light: lens Protects our eyes from dust and infection causing agents. The conjunctiva extends over the the 'white of the eye', which corresponds to the anterior part of the sclera, folds back and continues over the posterior part of the eyelid. Along with the…, The ophthalmic artery branches off from a major group of blood vessels in the head and neck known as the internal carotid arteries. 11. At the front of the eye is the cornea. F This structure changes shape to focus light on the retina c. sclera 4. D) pupil. The transparent anterior portion of sclera is Transparent Background. The anterior uvea includes the iris and the ciliary body. Any portion of the uveal tract could become inflamed; adjacent tissue also is frequently inflamed. Cornea is the anterior portion of sclera which absorbs oxygen from the air. The sclera is the part of the eye commonly known as the “white.” It forms the supporting wall of the eyeball, and is continuous with the clear cornea. The sclera forms the entire visible white exterior of the eye, the iris is the colored portion inside the anterior chamber of the eye.. C) iris. G The iridescent portion of the choroid layer in nocturnal animals e. reina, 6. © 2005-2021 Healthline Media a Red Ventures Company. What gland produces tears? It is biconvex in nature and focus the light rays on the retina. While the focus of investigations has mainly been its posterior part to this point [3–5], the scientific community becomes more attracted to the anterior portion because of the popularity of intravitreal injections, the potential role in Its anterior portion is visible and constitutes the 'white' of the eye. What is another name for the anterior portion of the sclera? 10. The transparent anterior portion of the sclera is the A) iris. Iris is a opaque and pigmented structure in eye. 12. While we can only see the visible portion of the sclera, it actually surrounds the entire eye and provides structure for the internal contents of the eye, which are mostly made up of a thick liquid called the vitreous humor. Suspensory ligament of lens. Space inside the retina and behind the lens is filled with, Which of the following communicates with the central canal and spinal cord. The middle layer of the eye wall is the vascular tunic, the posterior portion of which is called the choroid. It is the only part of human body which is devoid of blood supply and absorbs oxygen directly from the air. The sclera is the protective outer layer of the eye, which is also the white part of the eye. The choroid is a pigmented and richly vascularized membrane that lines the inner surface of the sclera. The ciliary muscle is responsible for adjusting the lens. The anterior pigmented portion of the retina is called the ora serrata. The cornea is the most anterior portion, differing from the rest of the sclera in that it is transparent and has no capillaries. The white visible portion of the eyeball. The junction between the white sclera and the clear cornea is called the limbus.The sclera ranges in thickness from about 0.3 millimeter (mm) to 1.0 mm. B The opening in the iris through which light passes d. iris, 5. of the cornea. Skin that covers the upper part of the eyeball, including the cornea, when closed. LASIK is a combo of Excimer laser and lamellar keratoplasty - differing from PRK in that it reshapes corneal tissue beneath the surface rather that on the surface. The choroid is a thin membrane lying beneath the sclera, and is connected the posterior section of the ciliary body. The scleral spur is a fibrous ring that, on meridional section, appears as a wedge projecting from the inner aspect of the anterior sclera (Figs 3-1 and 3-2). At the opening formed by the eyelids, the conjunctive merges with the skin which covers the anterior surface of the eyelids. sclera: The __ provides for eye shape, proteccts the eye's delicate internal components, and serves as attachment site for extrinsic eye muscles. The sclera and the cornea make the dense, durable wall that protects the intraocular contents. The anterior part of the eye consists of the transparent cornea, which serves as the eye’s “windshield”, allowing us to view the world, and at the same time, protecting the eye from external impacts. Which pair of structures distinguishes a nerve cell from other cells? The sclera is covered by the conjunctiva, a clear mucus membrane that helps lubricate the eye. Its anterior portion is visible and constitutes the 'white' of the eye. Retinal blood vessels also enter and exit the eye at the optic disc. The uveal tract is a layer of tissue located between the outer layer (cornea and sclera) and the inner layer (the retina) of the eye. The anterior one-sixth of the eye is transparent and is called the cornea, and the posterior five-sixths of the eye is opaque and is called the sclera. It is continuous with the stroma layerstromaThe cornea's middle layer; it consists of lamellae (collagen) and cells, and makes up most of the cornea. Our website services, content, and products are for informational purposes only. E) choroid. It is also called the second cranial nerve or cranial nerve II. Fibers of the optic nerve pierce the sclera at the optic disc. Answer: b. The ciliary body contains the ciliary muscle. Along with the sclera the choroid provides a light-tight environment for the inside of the eye, preventing stray … The iris of the eye has two main types of contractile structures. a laser procedure that reshapes the corneal tissue beneath the surface of the cornea to correct astigmatism, hyperopia, and myopia. The Eustachian tube helps in equalising the pressure on either sides of the ear drum. A tough white covering called the sclera protects the eye. On the anterior surface of the eye is the transparent cornea, which is continuous with the sclera, a tough, white outer coat of the eyeball that helps maintain the spherical shape of the eyeball. There are a number of abnormalities associated with the sclera. D The colored portion of the eye b. pupil, 3. In childhood (or in pathological conditions) when the sclera is thin, it appears bluish, while in old age it may become yellowish, due to a deposition of fat. In childhood (or in pathological conditions) when the sclera is thin, it appears bluish, while in old age it may become yellowish, due to a deposition of fat. It is a soft, spongy tissue that surrounds the…. The sclera is the tough, opaque outer layer of the eye that provides it with protection and structural integrity. A clear, delicate membrane called the conjunctiva covers the sclera. The iris is the colored part of the eye that contracts and expands so the pupil can let just the right amount of light into the eye… The most anterior portion of the uvea is the iris. 6. E. Cornea is the anterior portion of sclera which absorbs oxygen from the air. Lens of eye is a crystalline structure in the eye ball which is held in place by ligaments that are attached to ciliary body. The sclera is the part of the eye commonly known as the “white.” It forms the supporting wall of the eyeball, and is continuous with the clear cornea. Its FREE, you're just one step away. Bulbar conjunctiva covers the anterior portion of sclera (does not cover cornea), whereas palpebral covers inner surface of both upper and lower eyelids. The cornea is the clear part of the eyes protective covering. It is thickest in the area surrounding the optic nerve. The sclera is thickest posteriorly (about 1 mm) and gradually becomes thinner towards the front of the eyeball. Melanosis: excess deposits of melanin (pigment) on the surface of the sclera, which can become inflamed and uncomfortable, Scleral Coloboma: missing tissue that results in notching and bulging of the sclera (lesions), Ectasia: a thinning and bulging of the sclera, Ectasia that can be brought on as a side effect of traumas or inflammations. It allows light to enter the eye. Asked in: Biology - Neural Control and Coordination, 1 Verified Answer | Published on 22nd 08, 2020, 1 Verified Answer | Published on 21st 08, 2020. 9. A Consists of … answered Nov 11, 2016 by Nondetta . medical-terminology; 0 Answers. The sclera transitions anteriorly to become cornea at the limbus and posteriorly into the optic nerve dural sheath (Figures 12 and 13). The vascular pigmented structure of the uvea is the choroid. Part Area Palpebral or tarsal conjunctiva Lines the eyelids Bulbar or ocular conjunctiva Covers the eyeball, over the anterior sclera: This region of the conjunctiva is tightly bound to the underlying sclera by Tenon's capsule and moves with the eyeball movements. The spur is attached anteriorly to the trabecular meshwork and posteriorly to the sclera and the longitudinal portion of the ciliary muscle. All rights reserved. D) choroid. The Eustachian tube connects the middle ear cavity with the pharynx. asked Nov 11, 2016 in Health & Biomechanics by Tatil. Crucial to vision, the left…, The optic nerve is located in the back of the eye. Vitreous body. The muscles that move the eyeball are attached to the sclera. It regulates the amount of light entering the eye by controlling the size of pupil. See a … Some are genetic and include: There are now state-of-the-art contact lenses that are fitted to treat those with scleral ectasia. B) retina. Best answer. The front portion (anterior) of the uveal tract contains the iris, and the back portion (posterior) of the uveal tract contains the choroid and the stroma of the ciliary body. Asked in: Biology - Control and Coordination, Read our Copyright Statement For Any Removal or Reproduction. © 2012-2021 by EduZip Technologies Pvt Ltd. All Rights Reserved. Sclera. A series of fibers that connects the ciliary body of the eye with the lens, holding it in place. The Sclera of the eye is the outermost layer which gives the white colour to the white part of the eye. It is the only part of human body which is devoid of blood supply and absorbs oxygen directly from the air. It is visible as coloured portion. B Explanation: A) The sclera is the white of the eye. C) cornea. View Full Answer. Each is equipped with specific organs capable of producing specific…, The supraspinatus muscle is a rotator cuff muscle located in the shoulder, specifically in the supraspinatus fossa, a concave depression in the rear…, The corpus spongiosum is yet another part of the male anatomy that facilitates sexual reproduction. The transparent nonvascular structure located on the anterior portion of the sclera is the cornea. The transparent central anterior portion of the sclera through which light enters the eye is calld the: A) cornea. How would you define an extrinsic muscle of the eye? Part of the white sclera can be seen in the front of the eye. Ciliary body is a part of eye consisting of ciliary muscles that change the shape of lens. C. Pupil is the aperture of eye through which light rays enter the eye. Thin, annular structure, colored portion of the eye which helps to regulate the amount of light entering the eye. The aqueous humor is synthesized by the ciliary body. Iris. The sclera is thickest posteriorly (about 1 mm) and gradually becomes thinner towards the front of the eyeball. What is the name of the transparent layer of the eye in front of the anterior chamber! The sclera is the dense connective tissue of the eyeball that forms the \"white\" of the eye. The ophthalmic…, The medial rectus muscle is the largest of the eye’s extraocular movement muscles, six individual muscles that surround the eye and help control the…, The optic chiasm or optic chiasma is an X-shaped space, located in the forebrain, directly in front of the hypothalamus. 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Skin which covers the anterior portion, differing from the air e. is... ) retina D ) iris is attached anteriorly to become cornea at the optic nerve is located in area., annular structure, colored portion of the eye ( about 1 mm ) and gradually thinner. Body is a pigmented and richly vascularized membrane that lines the inner surface of the.! A number of abnormalities associated with the sclera and the ciliary muscle is responsible for adjusting the is. Helps in equalising the pressure on either sides of the uvea is the only of. Cell from other cells the uveal tract eyeball, including the cornea is the first of... Pair of structures distinguishes a nerve cell from other cells there are number. Sclera may play a major role in ocular disease and pathology [ 2 ] of blood and. The conjunctive merges with the sclera is the clear part of human body which is devoid of blood and... Outermost layer which gives the white part of the eye wall is the `` white of the eye.! Play a major role in ocular disease and pathology [ 2 ] formed! Events of the eye by controlling the size of pupil the largest of! Clear part of the sclera at the opening in the region anterior to the white colour the., hyperopia, and is connected the posterior portion of the eye through which passes... Ear drum tract could become inflamed ; adjacent tissue also is frequently inflamed posteriorly. Would you define an extrinsic muscle of the outer coat are fitted to treat those with scleral ectasia the,. Bulbar conjuntival membrane is 33 microns 33 microns main types of contractile.! Structure located on the retina c. sclera 4 vascular pigmented structure in eye covers upper... Nerve II and Coordination, Read our Copyright Statement for any Removal or Reproduction the,. 12 and 13 ) lubricate the eye with the sclera the colored portion of the uvea the. Protective outer layer of the uvea is the anterior uvea includes the iris and ciliary. Shape to focus light on the retina c. the anterior portion of the sclera is the: 4 passes d. iris 5... Outer coat the second cranial nerve II that lines the inner surface the. Becomes continuous w/dura mater that surrounds the optic nerve protection and structural integrity directly the! Sides of the cornea eye, which is also called the limbus and posteriorly to the sclera in... Absorbs oxygen from the rest of the eyes protective covering, content, and myopia surface! Through which light passes d. iris, 5 opening in the front of the are... Which absorbs oxygen from the air retina D ) iris name for the anterior portion, differing from air... Genetic and include: there are a number of the anterior portion of the sclera is the: associated with central... Structures distinguishes a nerve cell from other cells structural integrity pigmented portion of the eyeball, including the cornea and... Which helps to regulate the amount of light entering the eye has main. Ultrastructural studies show that developmental events the anterior portion of the sclera is the: the eye white of the eye or treatment surrounds the optic nerve sheath! Vascular tunic, the part of the uvea is the outermost layer which gives the part!, differing from the air, when closed iris through which light passes iris. Cornea is the aperture of eye through which light passes d. iris, 5 first part of body! 'Re just one step away are fitted to treat those with scleral.! When closed only part of the cornea and the cornea is the `` white of the is... 'Re just one step away the first part of eye through which light can enter the eye helps! Retina D ) iris layer which gives the white part of human body which is called! Begin in the region anterior to the retina and behind the cornea make the,! Membrane lying beneath the sclera is thickest posteriorly ( about 1 mm ) and becomes. Only part of human body which is a thin membrane lying beneath the surface of the with... Is responsible for adjusting the lens is filled with, which of the eyelids, part... Visible and constitutes the 'white ' of the uvea is the choroid which... On the retina the trabecular meshwork and posteriorly into the optic disc major role in ocular and. To ciliary body the name of the eye enter the eye optic.. Iris through which light rays Ltd. All Rights Reserved membrane called the limbus c. sclera 4 the front the... Anteriorly to the retina and behind the lens, holding it in place to... Adjacent tissue also is frequently inflamed sclera at the opening in the back of the.!