Week 1 - Inferior Oblique

Question 1

What is the origin of the inferior oblique

Answer 1

The origin is at the front of the orbit – it starts from a shallow depression in the anterior floor of the orbit

Question 2

What is the course of the inferior oblique

Answer 2

This muscle does not arise at the back of the orbit

The inferior oblique arises at front of eye in a shallow depression on the anterior floor of the orbit

it then passes under the eye at an angle of 50° underneath the inferior rectus (like a bra shape)

Question 3

Where does this muscle insert

Answer 3

This muscle insert on the far side of the eye behind the centre of rotation

It is on the temporal side

Question 4

Which nerve supply is the inferior a bleak

Answer 4

The inferior division of the third cranial nerve i.e. oculomotor nerve

Question 5

What are the primary and secondary actions of the inferior oblique

Answer 5

The primary action is elevation

The secondary action is abduction and extortion- it is increased