Orbit and nasal cavity Flashcards
What is the arterial supply to the nose
branches from ophthalmic and maxillary.
What is the nerve supply to the nose
CNI, V1, V2
Describe the process of olfaction
- Olfaction receptors in epithelium lining roof and walls,
- epithelium secretes a mucus fluid
- odoriferous gases are dissolved into fluid
- detected by the olfactory nerves
Describe the anatomy of the eye
- 3 layers
- Outer fibrous- sclera and cornea
- Vascular- iris
- Inner- retina
Located in orbit, suspended by muscles
superior rectus
-motor innervation
elevation
up and in
-CN3
inferior rectus
-motor innervation
depression
down and out
-CN3
medial rectus
-motor innervation
AD duction
-CN3
role of lateral rectus
-motor innervation
AB duction
-CN6
superior oblique
- action
- motor innervation
down and out
-CN 4
inferior oblique
- action
- motor innervation
up and out
-CN 3
What is the exit of CNIII
superior orbital fissure
what does CN IV supply
trochlear
motor to superior oblique
What does CN VI supply
abducent
motor to lateral rectus
What is the innervation to Levator Palpebrae
CN III
blood supply to orbit
opthalmic
infra orbital
central
nerve supply to the orbit
CN2,3, 4, V1(5), 6, 7
What are the 3 main nasal cartilages
major alar
lateral
septal
Paranasal sinuses [4]
- 4 paired air-filled spaces surrounding nasal cavity
- Frontal sinus
- Ethmoidal cells
- Sphenoid
- Maxillary sinus
Where do ethmoidal cells drain into?
if anterior or middle - middle meatus
if posterior- drains into superior meatus
Where do the sphenoidal sinuses drain into?
superior meatus
Where do the frontal sinuses drain into?
middle meatus
Where do the maxillary sinuses drain into?
middle meatus
Elevation of the eyeball is mainly the action of which muscle
inferior oblique
Depression of the eyeball is mainly the action of which muscle
superior oblique
