Ciliary Body
zonules
connect ciliary body to lens
Outer side of ciliary body
connected to sclera and scleral spur.
Nonpigmented Ciliary Epithelium
continuous with neurosensory retina at ora serrata.
Thickness of pars plicata
due to presence of processes and ciliary muscles.
Iris sphincter/dilator derivation
ectoderm
Marphan's syndrome
elastin defect causes lens to waver/rock.
Parasympathetic ciliary fibers
enter eye through short ciliary nerves and go to iris sphincter or ciliary muscle.
Scleral spur
extension of sclera that goes into angle of eye. tight connection with ciliary body.
Elastic layer
main layer of bruch's membrane. continuous with elastic from ciliary muscle
Largest vessel of vascular layer
major arterial circle near iris root.
Ciliary tendon
portion of ciliary muscle that connects to scleral spur and trabecular meshwork.
Origin of Ciliary Body
posterior extension of the iris
Insertion of ciliary muscle
sceral spur
Elastic tendons
surround ciliary tendon.
Origin of ciliary muscle
sclera at the optic nerve since that's where bruch's membrane is and is carrying elastic fibers from muscle.
Pars plicata ends at...
scleral spur
Fibroblasts
secrete collagen and elastic. not in bruch's membrane.
Pigmented Ciliary Epithelium
single layer cuboidal cells continuous with retinal pigmented epithelium. at ora serrata.
Major arterial circle of iris
(MAC) derived from anastomosis of anterior and long posterior ciliary arteries. Or just long posterior ciliary arteries.
Pars plicata
(corona ciliaris) more anterior portion of ciliary body. contains major and minor ciliary processes. heads closer to lens
Pars plana
(orbiculus ciliaris) more posterior part of ciliary body. begins at ora serrata.
Contraction of Ciliary muscle
affect drainage of aqueous. during accommodation.
Intramuscular circle of ciliary muscle
anastomosis of anterior ciliary arteries
Major ciliary processes produce
aqueous
Parasympathetic postganglionics
arise in ciliary ganglion and go to ciliary muscle.
Sympathetic postganglionics
arise in superior cervical ganglion and innervate arteries of ciliary body.
Both radial and circular fibers
attach anteriorly to scleral spur
Internal limiting membrane
basal lamina of NPE lines ciliary body with the vitreous and posterior champers. Give rise to zonules and fibrils.
Long and short ciliary nerves
based on how far travel in orbit.
Bruch's in pars plicata
basil lamina only
PE
becomes anterior epithelum of iris near iris root
NPE of pars plicata
becomes posterior epithelium of iris near the iris root.
Collagen Layer
between elastic layer and basal lamina.
Bruch's membrane
between vascular layer and pigmented epithelium. in both pars plana and choroid. noncellular. 3 layers
Core of ciliary processes
blood vessels of stroma, connective tissue, malanocytes.
Inner side of ciliary body
boudned by lens zonlues, posterior chamber, and vitreous
Ciliary body sensory fibers
cell bodies in semilunar/trigeminal ganglion
Accommodation action
ciliary body move inwardy anteriorlyl to relax zonules
Innervation of Ciliary Body
ciliary nerves, long and short.
Composition of supraciliary layer
collagenous fibers, melanocytes, fibroblasts.
Basal Lamina
made from pigmented ciliary epithelium
Color of ciliary muscle
transparent
Layers of the Ciliary Body
1. Supraciliary 2. Ciliary Muscle 3. Stroma 4. Bruch's membrane 5. Ciliary Epithelium
3 layers of Bruch's in pars plana
1. elasic 2. basal lamina 3. collagen
Subdivisions of ciliary muscle
1. longitudinal fibers 2. radial fibers 3. circular fibers
Radial fibers
curve more than the eye does so does not reach pars plana.
Ciliary Epithelium
divided into pigmented and nonpigmented.
Fenestrated capillaries of stroma
filter raw material for aqueous secretion.
Blood Aqueous Barrier
formed by tight junctions between NPE. Prevent material leaked from stroma from entering posterior chamber.
Ciliary Muscle blood supply
from both MAC and Intramuscular circle.
Location of stroma
in both pars plana and pars plicata. more in plicata.
First indication of ciliary processes
indentation/folding of outer cup wall by mesodermal-lined vessels.
Dentate processes
indentions of ora serrata
Ora Serrata
junction between retina and choroid
Stroma
layer of blood vessels and fenestrated capillaries.
Anterior Ciliary Body
less pigmented b/c of ciliary muscle.
Minor ciliary processes
located in valleys between major processes. pigmented valleys
Blood Supply of Ciliary Body
long anterior and posterior ciliary arteries. Drain to ciliary and choroid veins.
Connection with sclera
loose connection
Parasympathetic preganglionics
myelinated and arise in Edinger-Westphal nucleus
Sympathetic preganglionics
myelinated, arise in thoracic spinal cord
Ciliary muscle derivation
neural crest mesenchyme
Ciliary Body Epithelium derivation
neuroectoderm of optic cup posterior to future iris epithelium and anterior to future retina
Inner cup wall
nonpigmented epithelium
Supraciliary Layer
outermost layer of ciliary body. junction between ciliary body and sclera.
Divisiono of Ciliary body
pars plana par plicata
Posterior ciliary body
pigmented and marked by blood vessels and nerves
Outer cup wall
pigmented epithelium
Muscle stars
stellate arrangements of smooth muscle. give rise to elastic fibers/tendons that are continuous with elastic fibers of vessels and Bruche's membrane.
Ciliary processes blood supply
supplied only by MAC
Supraciliary layer continuous with...
suprachoroid at the ora serrata
Connection with scleral spur
tight connection with ciliary muscle in anterior pars plicata.
Longitudinal fibers
travel with curvature of the eye. insert in scleral spur. end at muscle stars.
Major processes (Color)
unpigmented/whitef since pigmented epithelial cells here no have abundant pigment.
Ciliary Muscle
within pars plicata. largest intrinsic eye muscle. Functions to cause accommodation
