Muscles of the Eye Flashcards
1
Q
name the 6 extraocular muscles and what nerve innervates them
A
lateral rectus (CN6) medial rectus (CN3) superior rectus (CN3) inferior rectus (CN3) inferior oblique (CN3) superior oblique (CN4)
2
Q
what are the anatomical movements of each muscle?
A
LR = abduction MR = adduction SR = elevation intorsion, adduction IR = depression, extorsion, adduction IO = extorsion, elevation, abduction SO = intorsion, depression, abduction
3
Q
how would you test each muscle in isolation?
A
LR = abduct MR = adduct SR = up and out IR = down and out IO = up and in SO = down and in
4
Q
what are the 3 movements of the superior rectus?
A
elevation, intorsion, adduction
5
Q
what are the 3 movements of the inferior rects?
A
depression, extorsion, adduction
6
Q
what are the 3 movements of the inferior oblique?
A
extorsion, elevation, abduction
7
Q
what are the 3 movements of the superior oblique?
A
intorsion, depression, abduction
8
Q
how would you test the function of CN4?
A
ask patient to look down and in
9
Q
how would you test the function of CN6?
A
ask patient to look laterally
10
Q
how would you test the function of CN3?
A
ask patient to look:
up and out (SR)
down and out (IR)
up and in (IO)
