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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
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

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%)


Parasympathetic Innervation (VII)

innervation of BV and Aq Formation

Sensory (V)

innervate ANT at Apex of Ant chamber
Baroreceptor function

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