Function, Innervation, and Blood Supply of the Ciliary Body Flashcards
What structure in the eye produces aqueous humor and where does it travel?
The ciliary processes apart of the pars plicata produces aqueous humor which travels into the posterior chamber, between the lens and iris, through the pupil, into the anterior chamber and then exits through the trabecular meshwork.
What increases the size of the pores in the trabecular meshwork?
Contraction of the ciliary body increases the size of the pores, which allows for aqueous humor drainage.
When the lens is in accommodation mode, what happens to the thickness of the anteroposterior axis and the equator?
The anteroposterior axis becomes thicker and the longitudinal/equator distance decreases.
When the lens is in distance vision mode, what happens to the anteroposterior axis and equator?
The lens thins along the anteroposterior axis and lengthens along the longitudinal/equator.
Sensory innervation of the ciliary body
Innervated by CN 5, the ophthalmic division– by the long ciliary nerve of the nasocilliary nerve
The long ciliary nerve (branch off the nasociliary nerve) innervates what structures of the eye
Cornea, bulbar conj, anterior sclera, and ciliary body
Motor innervation of the ciliary body
Autonomic parasympathetic by smooth muscle fibers
What arteriolar circle supplies the ciliary body
The major arterial circle of the iris (MACI) supplies the ciliary body
Are capillaries in the ciliary body stroma fennestrated or continuous?
They are fennestrated, which allows molecules to leak out of the capillaries and into the stroma for nutrients.
Which two arteries anastomose to form the MACI
The long posterior ciliary artery anastomoses with the anterior ciliary artery (branch off the muscular artery from the ophthalmic from the internal carotid) to form the MACI
Pathway of blood drainage from the ciliary body
Ciliary body — choroidal veins — vortex veins — superior and inferior ophthalmic
