2 Accommodation Flashcards
In the ciliary muscle, it’s dominated by _____ innervation which contracts the fibers.
Parasympathetic!!!!!
Smooth accommodative tracking ciliary muscle acts as own antagonist
3 ciliary muscles:
The ________ bundle is seen from “epichoroidal stars” that attach muscle to outer layer of choroid to scleral spur.
The _____ bundle (bifurcating fibers) are beneath the _____ bundle
Longitudinal (Brucke’s)
Radial; Longitudinal .
What fibers are referred to as having the greatest contribution to changing lens shape during accommodation?
Annular fibers
What’s the ciliary muscle’s PRIMARY function?
Releasing resting tension on the zonular fibers during accommodation
When you give a pt pilocarpine, where does the scleral spur move and what happens to effective filtration area?
Posteriorly.
Enhances flow across trabecular meshwork by opening up channels which increases the EFA!!
When you give a pt atropine, where does the scleral spur move and what happens to effective filtration area?
Returns to an atomic position and DECREASES flow across trabecular meshwork by CLOSING flow channels which DECREASE the EFA!!
What are zonules? Where do they come from?
Elastin-based fibers that stabilize the lens!!
Secreted by Non-pigmented ciliary epithelium
What does NPCE at the tips of ciliary processes do differently than those in the valleys?
Tips: secrete aqueous humor
Valley: producing (embryological) lens zonules and anchoring them!
What supplies the major force to accommodate the lens?
Lens capsule. Reduces the rate of capsule movement and retards extent of lens configuration changes
What’s the accommodative triad?
Pupillary constriction
Convergence of eyes
Accommodation
____________ nucleus (midbrain) sends out ___ganglionic parasympathetics that travel in CN_to synapse in ____ ganglion to become the ___Ganglionic parasympathetics that travel via short posterior ciliary nerves
Edinger-Westphal nucleus
Pre
CN3
Ciliary ganglion
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