Pterygium Anatomy

The larger posterior segment is composed of the scleral shell and has a radius of curvature of approximately 12 mm. Part of the undergraduates course of ophthalmology.

Pterygium Eye Health Nurse Teaching Human Anatomy And Physiology

It is characterized by degenerative changes of the collagen and.

Pterygium anatomy. In other words unless the skin is abnormal and stretched it is NOT pterygium. Yet without its clarity the eye would not be able to perform its necessary functions. Pterygium or Surfers eye is referred to as a pinkish wing-shaped ocular surface lesion or a benign tissue growth onto the cornea.

The condition typically effects the nail matrix nail bed and nail plate but sometimes all parts of the nail unit are involved. Dont be blind to the suns effects on eyes. Primary Pterygium is a triangular shaped fibrovascular tissue of bulbar conjunctiva that invades the cornea and occurs without any predisposing event like trauma or surgery.

The cornea lacks the neurobiological sophistication of the retina and the dynamic movement of the lens. The conjunctiva is a tissue that lines the inside of the eyelids and covers the sclera. The cornea is the transparent front part of the eye that covers the iris pupil and anterior chamberTogether with the lens the cornea refracts light accounting for approximately two-thirds of the eyes total optical power.

Cornea The cornea is the transparent clear layer at the front and center of the eye. The cornea has unmyelinated nerve endings sensitive to touch temperature and chemicals. Pterygium is a disorder that occurs by an overgrowth of the proximal nail fold on to the nail bed.

In fact the cornea is so clear that one may not even realize it is there. 2 Pterygium is an enigma and many theories have been proposed as to its pathogenesis. As a three-dimensional object the globe approximates an irregular oblong spheroid that can be divided topographically into segments of two modified spheres of different radii of curvature.

PTERYGIUM A pterygium is a fibrovascular wing-shaped encroachment of the conjunctiva onto the cornea usually in the horizontal meridian of the palpebral fissure. When fibrovascular tissue grows back across the limbus onto the cornea following the excision of primary pterygium it is referred to as recurrent pterygium 51. A horizontal cross section of the human eye showing the major parts of the eye including the protective covering of the cornea over the front of the eye.

It originates from the conjunctiva which is the outer layer of tissue containing blood vessels that covers over the white portion of the eye called the sclera and grows onto the cornea of the eye clear portion of the front of the eye. If the pterygium starts to grow over the cornea it can blur or obstruct vision and may need to be removed. In humans the refractive power of the cornea is approximately 43 dioptres.

Pterygia is a prevalent ocular surface lesion traditionally described as an encroachment of altered bulbar conjunctiva onto the cornea. Also called Glands of Ciaccio larger than Glands of Krause Situated in the upper border of the tarsus midway between the end of the tarsal glands 2 to 5 in the upper lid and 1-3 in the lower lid. It is composed of unkeratinized stratified squamous epithelium with goblet cells and stratified columnar epithelium.

Marginal Tarsal Arcade Peripheral Tarsal Arcade Anterior Ciliary Arteries. A Pterygium is a benign growth on the surface of the eye. 1 Its name originates from the diminutive of πτερυζ Greek small wing referring to its characteristic wing-like growth pattern.

If the pterygium starts to grow over the cornea it can blur or obstruct vision and may need to be removed. Pterygium - either of two thickened triangular layers of conjunctiva extending from the nasal edge of the eye to the cornea. M2OP131 A 65-year-old man is brought to his primary care provider by his concerned wife.

Histopathology shows hyaline degeneration with elastotic proliferation. It arises from irritation of the pinguecula conjunctiva - a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid. She reports he has had this thing on his eye for years and refuses to seek care.

1 2 and 3 The cornea constitutes the anterior segment covers one-sixth of the surface area and has a radius of curvature of approximately 8 mm. Dont be blind to the suns effects on eyes. Historically pterygia were considered to be degenerative lesions exemplified by degradation of Bowmans layer and.

The cornea is located just in front of the iris which is the colored part of the eye. He denies any pain or discharge from the affected eye. The conjunctiva is highly vascularised with many microvessels easily accessible for imaging studies.

The complexity of structure and function necessary to maintain such elegant simplicity is the wonder that draws us to one of the most important components of our visual system. The main purpose of the cornea is to help focus light as it enters the eye. In severe cases the nail plate is eventually replaced with scar-like tissue.

Sun exposure has also been linked to an abnormal growth on the corner of the eye near. Medical literature defines pterygium terr-idge-ee-uhm as any abnormal growth of skin that becomes stretched into a wing-like shape. Cornea iris pupil lens aque ous and vitreous humour ensuring that the right amount of light from the environment is captured and focused onto the fovea and macula t he most.

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