Eye - muscles

Question 1

Answer 1

Trochlea nerve supplies the SO

Question 2

What are the 3 nerves of the extrinsic ocular nerves?

Answer 2

3 4 6

Question 3

What is the pneumonic for muscles and cranial nerves?

Answer 3

SO 4
LR 6
everything else 3

Question 4

What innervation is the 3rd cranial nerve?

Answer 4

Occulomotor

Question 5

What CN carry parasympathetic?

Answer 5

3 7 9 10

Question 6

What nerve innervates glands?

Answer 6

CN 7

Makes things secrete

Question 7

What type innervation is the 4th cranial nerve?

Answer 7

Autonomic

Question 8

What is the role of the optic nerve?

Answer 8

Carries visual impulses from the eyeball. Leaves orbit through the optic foramen

Question 9

What way does the mesial recuts muscle help you move the eye?

Answer 9

Medially

Towards nose

Question 10

What way does the lateral rectus allow the ye to move?

Answer 10

Laterally

Away from nose

Abduction

Question 11

What muscle allow the eye to elevate?

Answer 11

Superior rectus

Question 12

What muscle allows the eye to look down? (Depression)

Answer 12

Inferior rectus

Question 13

What is the action of the superior oblique?

Answer 13

Intorsion

Question 14

What does the inferior oblique muscle allow?

Answer 14

Extortion

Question 15

When the superior oblique causes intosion, what is a consequence of this?

Answer 15

Depression and abduction

Question 16

What other movement does the inferior oblique muscle cause?

Answer 16

Elevation

Question 17

What does the abducens nerve innervate?

Answer 17

Lateral rectus

Question 18

What does the trochlear nerve innervate?

Answer 18

Superior oblique

Question 19

What muscles does the oculomotor nerve innervate?

Answer 19

Superior oblique and lateral rectus

Question 20

What are the signs of CNIII n palsy?

Answer 20

Ptosis, and eye is down and out, pupil may be non reactive

Question 21

What are the signs of CNIV palsy?

Answer 21

Eye shoots up when looking towards the nose

Question 22

What is the sign of CNVI palsy?

Answer 22

Eye cannot abduct

Question 23

Why would the reasons for CNIII palsy?

Answer 23

Diabetes - palsy and pupil find
Aneurism in brain - palsy and pupil involved

Question 24

What is the normal pupil reaction to light?

Answer 24

Constriction

Question 25

What is the significance of a third cranial nerve palsy and pupil involvement?

Answer 25

Aponeurosis

Question 26

What is the fovea?

Answer 26

a small depression at the center of the retina. It provides the sharpest vision in the human eye

Question 27

Answer 27

A = superior oblique B = medial rectus C = inferior oblique D = inferior rectus E = lateral rectus F = superior rectus

Question 28

What do the intrinsic eye muscles control?

Answer 28

Control pupil diameter

Question 29

What is the visual pathway?

Answer 29

Optic nerve Optic chiasm Optic tract To the thalamus and synapses Optic radiation

Question 30

What fibres cross over at the chiasm?

Answer 30

Nasal

Question 31

What are the 2 categories of ocular muscles?

Answer 31

Intrinsic and extrinsic

Question 32

What is the role of the intrinsic muscles of the eye?

Answer 32

Control pupil diameter and helps alter lens curvature to enable us to see near objects

Question 33

What is the role of the extrinsic muscles of the eye?

Answer 33

Also called extraoccular muscles Move the eye

Question 34

What muscle is responsible for constricting the pupil?

Answer 34

constrictor pupillae by parasympathetic (CNIII)

Question 35

What muscle allows the pupil to dilate?

Answer 35

Dilator pupillae by sympathetic (plexus around blood vessels)

Question 36

What happens to the eye when you want to focus on near object?

Answer 36

Ciliaris muscles for focussing on near objects When it constricts … It makes the lense more convex, needed for focus

Question 37

What happens to the pupil under parasympathetic innervation?

Answer 37

Constriction pupillae and Ciliaris muscle

Question 38

What are the only muscles to have an origin at the anterior and posterior aspect of the orbit?

Answer 38

Oblique muscle Inferior and superior oblique

Question 39

What is the origin of the recti muscles?

Answer 39

Apex of the orbit from the annular fibrous ring

Question 40

Answer 40

A = superior re the muscle B = levator palpebrae superioris

Question 41

What is a musc,e which is a,so classed as an extrinsic muscle of the eye?

Answer 41

LPS Levator palpebrae superioris

Question 42

What 2 extrinsic muscles does the oculomotor not supply?

Answer 42

SO LR

Question 43

Where does the oculomotor nerve synapse and what innervation does it carry?

Answer 43

at the ciliary ganglion parasympathetic

Question 44

What does the optic nerve innervate?

Answer 44

Carries visual impulses from eyeball. Leaves orbit through foramen