Ocular Anatomy Numbers Flashcards
How far from the limbus does the medial rectus insert
5.5mm
How far from the limbus does the IR insert
6.5mm
How far from the limbus does the LR insert
6.9mm
How far from the limbus does the SR insert
7.7mm
Where is the sclera the thinnest and how thin is it
Rectus insertions sites
0.3mm
Where is the scleral the thickest and how thick
Posterior pole
1mm
Where do the rectus muscles insert, anterior or posterior to the equator
Anterior
Where do the obliques insert, anterior or posterior to the equator
Posterior
Where are the obliques pure elevators/depressors
51-55 degrees to the nose
Where are the SR/IR pure elevator/depressor
23 degrees to the ear
What nerves run through the cavernous sinus
3,4,6,V1,VII
Normal axial length
24mm
Horizontal diameter of the eye
23.5mm
Vertical diameter of the eye
23mm
Lens anterior radius of curvature
8-14um (flat)
Lens posterior ROC
5-8um (steep)
PH of the lens
6.9
Refractive index of the lens
1.41 in the center
1,38 at the surfaces
Thickness of peripheral cornea
0.67mm
CCT
0.55mm
Posterior ROC or cornea
7.8 (flat)
Posterior ROC of cornea
6.5 (steep)
Horizontal diameter of the anterior cornea
11.7
Vertical diameter of the anterior cornea
10.6
Horizontal diameter of the posterior cornea
11.7
Vertical diameter of the posterior cornea
11.7
Layers of the cornea
Epithelium Bowmans Stroma Descemets Endothelium
Corneal epithelium thickness
50um
Bowmans thickness
15um
Corneal stroma thickness
450um
Descemets thickness
5-15um
Corneal endothelium thickness
5um
ROC of sclera
11.5mm
Where is the sclera the weakest
Lamina cribrosa
Normal pupil size
3-4mm
Width of iris
12mm
Thickness of the choroid at posterior pole
0.2mm
Thickness of choroid at ora
0.1mm
Thickness of bruchs
2um
Volume of vitreous chamber
80% of globe, 4uL
Water content of vitreous
98.5-99.7%
Type I collagen
Bones
Bowmans
Stroma
Sclera
Type II collagen
Vitreous
Type IV collagen
Descemets and BM
Blood aqueous barrier
Iris (minor circle)
NPCE
AE (dilator)
Schlemms canal
Blood retinal barrier
RPE cells (between) Around retinal BV
Where is the rod ring in the retina
5mm from the fovea
How large is the fovea
1DD (1.5mm)
-5mm temporal, 0.4mm inferior to disc
What wavelength for cyanolabe
440nm
Wavelength for chlorolabe
535nm
Wavelength for erythrolabe
565nm
Layers of the LGN for parvo cells
3,4,5,6
Layers of the LGN for magno cells
1, 2
How many photoreceptors
128 million
How many ganglion cells
1.5mill
How many bipolar cells
35million
How large is the macula
3.5DD
Size and thickness of foveola
- 35mm
0. 13mm thick
Size and thickness of fovea
- 5mm diameter (1DD)
0. 75mm thick
What is the thickest part of the retina
Parafovea (0.5mm)
How big is the perifovea
1.5mm
Vertical diameter of the ON
1.75mm
Horizontal diameter of the ON
1.5mm
How long is the ON
50-60mm
Intraocular portion of the ON
1mm
Intraorbital portion of the ON
30mm
Intracanalicular portion of the ON
6-10mm
Intracranial portion of the ON
10-16mm
What layers of the LGN do contralateral fibers go to
1,4,6
What layers of the LGN do uncrossed fibers go to
2,3,5
Where do superior fibers run
Medial
Where do inferior fibers run
Laterally
Eyelid layers
Skin SubQ areolar layer Orbicularis SubM areolar layer Orbital septum Post muscular system Tarsal plate
Ciliary body layers
Supraciliaris
Ciliary muscle
Ciliary stroma
Ciliary epithelium
Choroid layers
Suprachoroid lamina
Stroma
Choriocapillaris
Bruch’s membrane
Layers of bruchs membrane
BM of choriocapilaris Outer collagenous zone Elastic layer Inner collagenous zone BM of RPE
Layer of the sclera
- conjunctival epi (ACA)
- conj stroma
- tenons
- episclera (ACA)
- sclera
- lamina fusca
Retinal layers
RPE PR ELM ONL OPL INL IPL GCL NFL ILM
Photoreceptors synapse with what in the OPL
Bipolar and horizontal cells
What cell bodies are in the INL
horizontal
bipolar
Amacrine
What synapses occur in the IPL
Bipolar to ganglion cells
Amacrine to both
What are the inhibitory cells in the retina
Horizontal and amacrine
RI of aqueous and vitreous
1.336
