Flashcards on Ciliary Body

Ora serrataScleral spurPosterior chamber

Sclera on the outer surface, pigment epithelium internally

Contains the Ciliary muscle for innervation by the SPCN's of CN III (from the ciliary ganglion) for accommodation. Also contains the NPCE for aqueous humor production

Pars Plana and the Pars Plicata

Wide anterior portion of the ciliary body that contains the ciliary processes. Has 70-80 processes that extend into the posterior chamber. Valleys of Kuhnt: Region between the ciliary processesNon-pigmented ciliary body epithelium of pars plicata=responsible for secretion of aqueous

Flatter more posterior portion of the ciliary body that begins at the pars plicata and extends posteriorly to the ora serrata. This area of the ciliary body is responsible for the production of zonular fibersDentate processes = Retinal extensions onto the pars planaBays: areas of the pars plana between the dentate processesCourse of the lens zonules: arise from the pars plana and extend into the valleys of Kuhnt, then to the lens capsule. If zonules are broken or ruptured, this can cause lens subluxation or dislocation

1. Supraciliaris2. Ciliary Muscle3. Ciliary stroma4. Ciliary epithelium

Outermost layer of the ciliary body, loose connective tissue that allows sliding against the sclera. Continuous with the suprachoroid (outer layer of choroid)Loose connective tissue with layer of collagen bands that serve as space for BVs and nerves from the suprachoroid to traverse. Fluid can also accumulate in this potential space, causing a ciliary body detachment.

Smooth muscle used for accommodation. Innervated by both sympathetic and parasympathetic systems. Utilizes the scleral spur as an anchor anteriorly, and inserts posteriorly into the stroma of the choroid. Three types of fibers: 1. Longitudinal: largest portion of ciliary muscle fibers. Lies adjacent to the supraciliaris of the ciliary body and parallel to the sclera. The bundles in the longitudinal muscle form a V shape, originating at the scleral spur and TM, with legs extending into the choroid2. radial: also extend as a V from the scleral spur, but terminate by inserting into the connective tissue near the base of the ciliary processes. 3. circular: the smallest portion of fibers, also called muller's muscle. they lie most medial, closest to the lens

Parasympathetic stimulation causes contraction of the ciliary muscle, which decreases the diameter of the ciliary body ring, releasing tension on the lens zonules. This process allows an increase in the anterior (most) and posterior curvature of the lens, a decrease in lens diameter, and an increase in lens thickness. REMEMBER: Accommodation causes a temporary decrease in IOP: contraction of the ciliary muscle pulls on the scleral spur, which pulls on the TM and opens up pores for outflow. **THIS MOA IS HOW PILOCARPINE WORKS**

Between the Ciliary muscle and the epithelial layers of the ciliary body. Highly vascularized area of the ciliary body. It contains MACI

Located near the iris root, inward from the ciliary muscle. has large stromal capillaries, located near the epithelim that are FENESTRATED (leaky junctions). These fenestrations allow large substances to exit the blood and enter the A/C. However, TIGHT zonular junctions of the NPCE regulated their release into the A/C. protein concentration in the blood is 7% compared to 2% in the aqueous.

The bloodstream via the fenestrated capillaries of the Major arterial circle of the iris

Anterior pigmented ciliary epithelium (continuous with Non-pigmented anterior epithelium of iris anteriorly and RPE posteriorly.Posterior pigmented ciliary epithelium (continuous anteriorly with the posterior pigmented iris epithelium and posteriorly with the neural retina. (after the ora serrata)