Muscles Moving Eyeballs And Upper Eyelids

Question 1

What is the name of muscles that move eyeballs and what is the purpose of is name?

Answer 1

Extraocular (extrinsic eye) muscles
Bc they originate outside of the eyeballs(in the orbit) and insert on the outer surface of the sclera( white of the eye)

Question 2

True or false
The extraocular muscles are some of the fastest contracting and most precisely controlled skeletal muscles in the body.

Answer 2

True

Question 3

Three parts of the extraocular muscles control movements of the eyeballs. What are they?

Answer 3

1= superior and inferior recti
2 lateral and medial recti
3 superior and inferior obliques

Question 4

What muscles of the extraocular region are not named by their actions.

Answer 4

Superior oblique moves the eye inferiorly and laterally and inferior oblique moves the eyeballs superiorly and laterally

Question 5

What is strabismus? What causes this?

Answer 5

Condition in which the two eyeballs are not properly aligned, it can be hereditary or due to birth Injuries, poor attachments of the muscles,problems with the brains control centre or localized disease.

Question 6

What happens in strabismus?

Answer 6

each eye sends an image to a different area of the brain and because the brain usually ignores the messages sent by one of the eyes, the ignored eye becomes weaker, hence “lazy eye,” or amblyopia, develops.

Question 7

What’s the result of external strabismus?

Answer 7

Results when a lesion in the oculomotor (III) nerve causes the eyeball to move laterally when at rest, and results in an inability to move the eyeball medially and inferiorly.

Question 8

What is the result of internal strabismus?

Answer 8

a condition in which the eyeball moves medially when at rest and cannot move laterally. A lesion in the abducens (VI) nerve results in internal strabismus

Question 9

What are treatment options for strabismus?

Answer 9

depend on the specific type of problem and include surgery, visual therapy (retraining the brain’s control center), and orthoptics (eye muscle training to straighten the eyes).

Question 10

True or false?

the levator palpebrae superioris does move the eyeballs, since its tendon passes the eyeball and inserts into the upper eyelid.

Answer 10

False
It doesn’t move the eyelid. It raises the upper eyelids, opens the eyes. It is therefore an antagonist to the orbicularis oculi, which closes the eyes.