EXTRAOCULAR MUSCLES

Question 1

what are the 7 extra ocular muscles?

Answer 1

superior rectus
lateral rectus
medial rectus
inferior rectus
inferior oblique
superior oblique
levator palpeerde superioris

Question 2

where does the levator palpebral superioris originate?

Answer 2

lesser wing of sphenoid bone

Question 3

where does the levator palpebral superioris attach?

Answer 3

superior tarsal plate of upper eyelid

Question 4

whats the action of levator palpebral superioris?

Answer 4

elevates upper eyelid

Question 5

what innervates the levator palpebral superioris?

Answer 5

oculomotor nerve

but superior tarsal muscle is innervated by sympathetic nervous system

Question 6

where do the recti muscles originate?

Answer 6

common tendinous ring

Question 7

where does the superior rectus muscle attach?

Answer 7

superior and anterior region of sclera

Question 8

whats the action of the superior rectus muscle?

Answer 8

elevates eyeball

also assists in some adduction and medial rotation

Question 9

what innervates the superior rectus muscle?

Answer 9

oculomotor nerve

Question 10

where does the inferior rectus muscle attach?

Answer 10

inferior anterior sclera

Question 11

what Is the action of inferior rectus?

Answer 11

depression

assists on adduction and lateral rotation

Question 12

what innervates the inferior rectus muscle?

Answer 12

oculomotor nerve

Question 13

where does the lateral rectus attach?

Answer 13

anterolateral sclera

Question 14

whats the action of lateral rectus muscle?

Answer 14

abduction

Question 15

what innervates the lateral rectus muscle?

Answer 15

abducens nerve cn6

Question 16

where does the superior oblique muscle originate?

Answer 16

body of sphenoid

Question 17

where does the superior oblique muscle attach?

Answer 17

sclera of the eye but posterior to superior rectus

Question 18

whats th action of the superior oblique?

Answer 18

depresses, abducts and medially rotates

Question 19

what innervates superior oblique?

Answer 19

trochlea nerve cn4

Question 20

where does the inferior oblique originate?`

Answer 20

anterior aspect of orbital floor

Question 21

where does the inferior oblique attach?

Answer 21

sclera of the eye posterior to lateral rectus

Question 22

whats the action of the inferior oblique?

Answer 22

elevates, abducts and laterally rotates

Question 23

what innervates the infeiror oblique muscle?

Answer 23

oculomotor nerve

Question 24

what would you see in an oculomotor nerve palsy?

Answer 24

eye down and out

Question 25

what would you see in a trochlear nerve palsy?

Answer 25

normal eye but diplopia and head tilt

Question 26

what would you see in an abducens nerve palsy?

Answer 26

adducted eye - due to resting tone of medial rectus

Question 27

what causes horners syndrome

Answer 27

damage to the sympathetic trunk in the neck - can be caused by Pancoast tumours, thyroid carcinomas etc

Question 28

how does horners syndrome present?

Answer 28

partial ptosis
anhidrosis on ipsilateral side
miosis

Question 29

what causes the partial ptosis in horners syndrome?

Answer 29

denervation of the superior tarsal muscle

Question 30

what causes the miosis in horners syndrome?

Answer 30

denervation of dilator papillae muscle

Question 31

what causes anhidrosis in horners syndrome?

Answer 31

denervation of sweat glands