Anatomy Flashcards
What does the lacrimal apparatus do?
Secret tears.
What is the hard boy structure which protects the muscles, vessels, and nerves?
The orbit.
The fibrous layer forms which two parts?
The Cornea and Sclera
What is the vascular layer under the sclera and above the retina?
Choroid
What are the three layers of the eye ?
fibrous, vascular and inner
What does the sclera compose of ?
The sclera comprises the majority of the fibrous layer (approximately 85%). It provides attachment to the extraocular muscles – these muscles are responsible for the movement of the eye. It is visible as the white part of the eye.
What does the cornea compose of ?
The cornea is transparent and positioned centrally at the front of the eye. Light entering the eye is refracted by the cornea.
What layer sits under the fibrous layer ?
The vascular layer
What does the vascular layer compose of ?
The
1- chorcoid
2- Cillary body
3- iris
What is the choroid ?
Choroid – layer of connective tissue and blood vessels. It provides nourishment to the outer layers of the retina.
What is the cillary body ?
Ciliary body – comprised of two parts – the ciliary muscle and ciliary processes. The ciliary muscle consists of a collection of smooth muscles fibres. These are attached to the lens of the eye by the ciliary processes. The ciliary body controls the shape of the lens, and contributes to the formation of aqueous humor
What is the iris ?
Iris – circular structure, with an aperture in the centre (the pupil). The diameter of the pupil is altered by smooth muscle fibres within the iris, which are innervated by the autonomic nervous system. It is situated between the lens and the cornea.
What is in the inner layer of the eye ?
Th retina
Where is the lens located?
The lens of the eye is located anteriorly, between the vitreous humor and the pupil. The shape of the lens is altered by the ciliary body, altering its refractive power. In old age, the lens can become opaque – a condition known as a cataract.
What is the retina ?
Retina – Has photoreceptors, our rods, and cones. This is involved in receiving the light and turning the light from light energy into neuron energy and sending that signal through the optic nerve into the brain.
