Anatomy of the eye includes lacrimal gland, cornea, conjunctiva, uvea (iris, choroid & ciliary body), lens, blood supply, retina, vitreous & optic-nerve. For ophthalmologists, optometrists, medical, dental, and optometry students, eye-anatomy forms the basis for eye-pathology in diseases: dry eye, retinal detachment, macular degeneration, diabetic retinopathy, eye-trauma etc.

About Mission for Vision


Wednesday, October 19, 2005

Orbit- CT Images

Click on Picture for Enlarged View

CT scan below the orbits includes a section through the auditory canal and nose to show:
1. Maxillary sinus with the nasolacrimal duct just medial.
2. Temporalis fossa with the zygomatic arch at the arrow. Note the absence of bone on the opposite site.
3. Nasal septum.

Click on picture for enlarged view.

CT scan above the opening for the nasolacrimal duct in the lacrimal fossa and includes the inferior orbital fissure.
4. zygoma
5. inferior orbital fissure (note that the fissure is oriented medially and narrows slightly posteriorly).
6. greater wing of the sphenoid
7. nasolacrimal duct
8. inferior rectus muscle

click on picture for enlarged view.

Number 7 here demonstrates the superior orbital fissure. This is most commonly mistaken for the optic canal. However, note that this opening is oriented laterally from the midline plane not medially. This is a key clue to the correct identification. Compare to the image of the CT scan that captures the optic canal below.

Click to enlarge photo

Here we see the optic canal (12 in the figure), which is of course medial to the tip of the superior orbital fissure and which is captured in this scan more laterally.

Click to enlarge the photo.

This CT image shows a level at the top of the orbit so that the lacrimal gland is evident (17). The real challenge here is number 15. This requires a great deal of knowledge. The structure starts lateral in the posterior orbit and moves medially. The immediate guess is that 15 is the superior oblique muscle. However, the origin for the superior oblique is medial to the optic canal, not lateral (see extraocular muscle origins). Therefore this is a critical but forgotten structure, the superior ophthalmic vein, which is descending to exit the superior orbital fissure in a lower plane (see venous drainage of the orbit). Correct identification of the dilated superior ophthalmic vein is key for the diagnosis of carotid-cavernous sinus fistulas.

Included is an excellent view of a dissected orbit. Click here to open the image in a new window.


Blogger Unknown said...

different watches carved iwc replica watches is often to be found in lots of like-minded layouts plus fashions. You are going to only need to get this types of rado replica this most effective satisfies to the qualified demands plus wants inside an impeccable and classy style. Remarkably they can be very reasonably priced different watches. To use in this,
rolex replica uk will be distinctively phony different watches. Level of quality intelligent, the first thing is definitely sure for the rolex replica uk potentially they are unreal symbols to get countless people today on the earth over the last. When you are a reliable n entrepreneur, dressed in a strong replica rolex
probably are not a strong preposterous preference for yourself by any means. When you are your sportsman by way of industry.

1:05 AM  
Blogger Unknown said...

In the event that you have a high regularly scheduled installments or basically a variable rate of intrigue which has all of a sudden jumped, then you may be unequivocally the individual who congress considered at the time they outlined The Hardship Loan Mod Plan. cash advance chicago

10:20 AM  
Blogger anjli said...

Finally, you reach your desired destination with beautiful, sexy, sweet and escorts to fulfill your demand.Russian Call Girls in Gurgaonis the place where you can make you each moment special and excitement with full of love, sex, flirt, fun and many more. Check our other Services...
Russian Call Girls in Gurgaon
Russian Call Girls in Gurgaon
Russian Call Girls in Gurgaon
Russian Call Girls in Gurgaon
Russian Call Girls in Gurgaon
Russian Call Girls in Kolkata

6:14 AM  
Blogger Antony Christ said...

It was nice to read your blog. If anyone needs case study help then visit to our website:- Assignment Help Australia . We provide all type of case study assignments for MBA, Nursing, Laws and Engineering students.

You can visit us at the given link:-
Case Study Help
Assignment Help
MBA Assignment Help
Assignment Samples
Case Study Writers

3:29 AM  
Blogger Antony Christ said... is most rated and trusted assignment help services provider in the world.
We are provide all assignment writing services for nursing all subjected like pharmacology,human anatomy and physiology etc. at affordable prices.
It is not copy paste 100% plagiarism free and proper content.
nursing case study help

1:26 AM  

Post a Comment

<< Home