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26 terms

Ciliary Body

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Where does the ciliary body lie in comparison to the rest of the uveal components
in the middle
Originated from
Mesoderm and neuroectoderm
When does this develope
3rd mo of embryonic life, but not fully formed until after birth
Functions of the Ciliary Body
Aq. Humor formation
Accommodation
Absorb light
2 regions of the Ciliary Body
Pars Plana- Orbicularic Ciliaris
Pars Plicata- Corona Ciliaris
Pars Plana
POST region
Continuous into choroid and retina (w epith cells)
Ora Serrata
junction bw the ciliary body(pars plana) and retina
Pars Plicata
ANT region- ridged
Ciliary Processes- increase SA, Vascularity, and produce aq
FENESTRATED capillaries, with increase resistance to pressure
LITTLE connective tissue- bc then fluid couldn't flow as easily
What area in the uvea is the only one to contain Fenestrated capillaries
Ciliary body
Layers of the Ciliary Body
Epthelium
Ciliary Body Stroma
Ciliary Muscle
Epithelium is split into two parts
Pigmented epithelium (Ext row)
Ciliary epithelium (Int row)
Pigmented epithelium
pigmented from RPE up to Iris, where it ends and Iris begins
Ciliary epithelium
Increase of organelles= increase metabolic for Aq formation
becomes NEURAL retina
Ciliary Body Stroma
increased number of BV and Nerves
also pigmented
Sensory innervation- ophthalmic sensory fibers
Ciliary Muscle has 3 arrangements of fibers
Meridonial Fibers
Radical Fibers
Circular Fibers
Meridonial Fibers (longitidunal)
bulk of fibers, PARALLEL to outer coat
Radical Fibers
OBLIQUE orientation, out from scleral spur
Circular Fibers(most internal)
ANNULAR orientation
Sphincter action
Ciliary Body is the largest...
Smooth Muscle in the eye!
Basement membrane wraps around cells except for
areas with Desmosomal and Gap Junctions- contraction
What kinds of innervation is present
Diffuse- single nerve can innervate multiple muscles fibers
The Arteries and Arterioles have what kind of innervation
Dual Autonomic
Parasympathetic Innervation (III)
myelinated, S.M.
Short Ciliary Nerves- Vertical
Long Post. Nerves- Horiz
Sympathetic Innervation(1%)
INHIBITORY
Parasympathetic Innervation (VII)
innervation of BV and Aq Formation
Sensory (V)
Ophthalmic/Maxillary
innervate ANT at Apex of Ant chamber
Baroreceptor function