Week 1 - C - Anatomy Workshop (dissection) Flashcards
Name the 2 parts of the fibrous membrane of the eyeball?
The cornea and the sclera
What are the parts of the uvea of the eye?
Have the iris, the ciliary body and the choroid The choroid is a highly vascular area
What are the muscles of the eye that change the shape of the pupil?
These are the muscles of the iris Have the dilator pupillae - when contracting cause the iris to widen (dilate) allowing more light to enter Have the sphincter pupillae - when contract cause the pupil to be constrict allowing less light to enter
What is the nerve supply of the dilator and sphincter pupillae of the iris? What is the other name for the dilator pupillae?
Dilator pupillae (aka radial muscles of the iris) have parasympathetic supply from the oculomotor nerve Shincter pupillae are under sympathetic control
What happens to the ciliary body muscles in flight or fight muscle control?
The iris needs to focus on vision during fight or flight Therefore lens must be flat Ciliary muscles relax causing the sensory ligaments to be stretched This will flatten the lens allowing the eye to see further
If the lateral rectus contracts then the superior rectus muscle contracts, what quadrant of vision will the eye be looking at?
Moves eye laterally then upwards (with a little in) Therefore the upper temporal quadrant
If looking at the upper temporal quadrant of vision, which quadrant of the retina will light hit from this?
Will hit the lower nasal quadrant of the retina
Blow out fracture occurs Instructions are to look forward Left eye looks forward however right eye looks to the left (medially) What muscle could be the cause?
Right medial rectus muscle palsy - muscle is trapped preventing the eye from looking forward
Blow out fracture occurs Instructions are to look to the right Left eye looks forward however right eye looks to the right (laterallY) What muscle could be the cause?
Left lateral muscle palsy
Why are patients with blow out fractures instructed NOT to blow nose for 2 weeks after fracture?
Due to suspected fracture of medial wall of the orbit Danger of communication betweem nasal cavity and orbit via the ethmoidal air cells - blowing nose could force nasal commensal bacteria through the connection causing orbital cellulitis
What is the gland in the superolateral region of the eye? What is the enrve supply?
Lacrimal gland Supplied by the greater petrosal branch of the facial nerve - parasympathetic supply
What ligaments come off the superior and inferior tarsal plate connection attaching eyelid to the medial and lateral margin of the orbit? (zygomatic bone)
This is the medial and lateral palpaberal ligament
When looking at the fundus of the eye, what do the quadrant lines go through?
They go through the macula
What quadrant of vision does the optic nerve/disc lie in on fundoscopy?
Lies in the upper nasal quadrant
