Ocular Globe Anatomy

The sclera and cornea which make up the protective outer layer of the globe and maintain its shape and pressure. Increase the depth to include the entire globe and proximal optic nerve.

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Anterior chamber When we move from anterior to posterior the first area is the anterior chamber.

Ocular globe anatomy. And the uveal tract which makes up the middle vascular layer and contains the choroid ciliary body and iris 14. US of the ocular globe is discussed with emphasis on eye anatomy imaging technique normal and pathologic findings and ophthalmoscopic correlation. Its mechanical properties and limited distensibility help contain the intraocular pressure and prevent deformations of the globe during extraocular movement.

A primary understanding of the globe anatomy is key to characterising both traumatic and non-traumatic globe abnormalities. Computed tomographymagnetic resonance imaging CTMRI are complimentary for ocular imaging and are performed for evaluation of the vitreous cavity choroid retina sclera and potential spaces and for the assessment of extension of disease beyond the globe into the orbit or brain. Gross anatomy Location The globe is suspended by the bulbar sheath in the anterior t.

Highlights key structures in the anterior and posterior segments of the globe. In man and other vertebrates the iris controls the amount of light entering the eye and the lens focuses the light onto the retina. The comparative anatomy between the eye ultrasound and the anatomy diagram above.

Specific pathologies within the anterior chamber are. Eye globe abnormalities can be readily detected on dedicated and non-dedicated CT and MR studies. It is bounded by the cornea anteriorly and the lens and iris posteriorly.

The remaining two eye muscles are the superior and inferior oblique muscles. When performed by a trained examiner ultrasonography US of the eye is a useful tool in diagnosing conditions of the ocular globe especially when combined with ophthalmoscopy. There are three types of cones each containing a substance that reacts to light of a different color one set for red one for green and one for violet.

1 2 and 3. Similarly in sagittal ask the patient to look updown. Ultrasound of globe rupture.

The sclera choroid and the retina. The recti and oblique muscles closely surround the greater part of the eyeball and are capable of changing its position within certain limits. The Ocular Trauma Score is often used to predict visual outcome of patients after open-globe ocular trauma ranging from 1 most severe injury and worst prognosis at 6 months follow up to 5 least severe injury and least poor prognosis at 6 months with globe rupture holding the worst prognosis followed by endophthalmitis perforating injury.

Ocular space The eye has the following well defined anatomic spaces. The superior oblique also originates in the posterior orbit but courses nasally until it reaches the trochlea or pulley before inserting onto the eye. Ultrasound image of a normal eye with lens.

The globe consists of three primary layers. The key structures of the globe starting at the front of the eye and moving backwards include. The cones are responsible for color vision.

The ocular globes or simply the eyes are paired spherical sensory organs located anteriorly on the face within the orbits which house the visual apparatus. The methodology employed for the dissection of the cadavers ocular globe is in the view of the authors who performed the procedure an efficient alternative for teaching the anatomy of the eye being a low cost option making it possible to study. In transverse ask the patient to look left and right to facilitate maximum scan range.

The lacrimal nerve innervates the lacrimal gland The frontal branch innervate the eyebrow and scalp. The sclera outer uvea middle and retina inner layer. They cover the full range of adaptation to light the cones being sensitive in bright light and the rods in dim light.

Rupture of the globe. The nasociliary branch enters the orbit through the annulus of Zinn and then gives off short and long ciliary nerves to the globe. A hollow structure the bulbus oculi is composed of a wall enclosing a cavity filled with fluid with three coats.

The inferior oblique originates from the orbital floor and inserts behind the globe near the macula. The globe of the eye or bulbus oculi is the eyeball apart from its appendages. A transparent structure forming the anterior 16th of the globe responsible for the refraction of light entering the eye.

The globe consists of three layers. A hyperechoic foreign body blue in the eye. THE EYEBALL Size-average AP diameter is 21-26mm Circumference-72mm At birth is appox16mm At age of 3yrs -23mm It reaches its maximum size2years very little growth there after Has 3 concentric layers Connected to the brain by optic nerve Protected by bony orbit and eyelids.

A high-resolution linear array ultrasound transducer is being applied to the closed eyelid to perform an ocular examination. The ophthalmic artery has many branches which may be separated into 2 groups. The lids with the plica.

Normally the bulbus oculi is bulb-like structure. Orbital Group Ocular Group. The retina which makes up the sensory inner layer.

The long ciliary nerves are responsible for dilatation of the pupil. Methodology of teaching anatomy of the ocular globe 241. The sclera forms five-sixths of the outer tunic of the eye consists of dense fibrous tissue and contains openings and canals for the various vessels and nerves entering and exiting the globe Figs.

Blood supply to the orbital arises primarily from the ophthalmic artery - the first branch off of the internal carotid as it emerges from the cavernous sinus on the medial side of the clinoid process. Ocular cross-sectional imaging is usually obtained as an adjunct to clinical ophthalmologic examination and ocular ultrasound. The globe or ball of the eye is a composite structure of spheroidal form placed in the fore part of the orbital cavity and receiving the thick stem of the optic nerve behind.

Overview of ocular anatomy. Anatomy the organ of sight of animals containing light-sensitive cells associated with nerve fibres so that light entering the eye is converted to nervous impulses that reach the brain.

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