The eye is derived from what?
Ectoderm
What structures of the eye are derived from neruoectoderm of the forebrain?
Retina and pigmented structures
What parts of the eye are derived from surface ectoderm?
Lens and cornea
Fibrous coats (sclera) is derived from what?
Neural crest mesenchyme
The sclera is part of what tunic?
Fibrous (outermost Tunic) q
What are characteristics of the sclera?
Thick, dense, FIRM, opaque
The sclera maintains it shape when what happens?
Pressure inside the eye increases
What structures pass through the sclera?
Blood vessels, neurons
What kind of muscles attach to the sclera?
Extraocular
Anteriorly, the sclera transitions to the cornea where?
The Limbus
What is the primary refractory part of the eye?
Cornea
What does the cornea look like>?
Clear, transparent
Is the cornea convex or concave to the anterior?
Convex
What part of the cornea is continuous with the conjunctiva?
Corneal epithelium
What is the largest part of the cornea?
Substantia propria
What is in the vascular Tunic?
Choroid, ciliary body, iris
Is the choroid thick or thin, good or bad blood supply?
Thin, RICH blood supply
Blood vessels in the choroid are heavily supplied by what?
Autonomic vasomotor fibers (especially sympathetic)
How is the choroid attached to the sclera?
Loosely
Where is the only spot where the choroid is firmly attached to the sclera?
Where the optic nerve penetrates it
Is the choroid lightly or darkly pigmented?
Darkly
The ciliary body is continuous with what to the posterior?
Choroid
The ciliary body is continuous with what to the anterior?
Iris
What suspends the lens?
The ciliary body
What does the ciliary body produce and where is it found?
Aqueous fluid, anterior segment of the eye
Contraction of the ciliary muscle allows the lens to become more_________allowing for _________vision?
Convex, near
Besides producing aqueous fluid, it is possible that the ciliary body can produce what?
GAGS
What is the colored part of the eye ?
Iris
What divides the anterior segment into anterior and posterior chambers?
Iris
What two muscles control the size of the pupil ?
Sphincter pupillae, dilator pupillae
Sphincter pupillae contains fibers that are arranged in what fashion?
Circumferentially
Dilator pupillae is innervated by what fibers?
Sympathetic fibers