Extrinsic Eye Muscles

1. Why are the muscles responsible for moving the eye called extrinsic eye muscles?

They are called extrinsic due to their origin from the brainstem.

They are termed extrensic because they originate within the orbit and insert onto the white outer surface of the eye (the sclera)

Extrinsic eye muscles are named so because they are responsible for pupil dilation.

Because they are located inside the eyeball.

Extrinsic eye muscles are termed as such because of their origin and insertion points on the eye's structure, which sets them apart from intrinsic eye muscles that are located within the eyeball. The correct answer explains this distinction in detail.

Explanation

Extrinsic eye muscles are termed as such because of their origin and insertion points on the eye's structure, which sets them apart from intrinsic eye muscles that are located within the eyeball. The correct answer explains this distinction in detail.

2. How are muscles named based on their location?

Their name is based on the color of the muscle.

Their name derives from the location of their insertion on the anterior part of the sclera. ie; medial, lateral, inferior, superior

Their name is randomly assigned by scientists.

Their name is derived from the length of the muscle fibers.

Muscles are typically named based on their location of insertion or origin, which helps in identifying their function and location in the body.

Explanation

Muscles are typically named based on their location of insertion or origin, which helps in identifying their function and location in the body.

3. What is the function of the medial rectus and where is it located?

The inferior oblique attaches to the bottom surface of the eye and pulls it laterally (EXTORSION).

The superior rectus attaches to the top surface of the eye and pulls it upward (ELEVATION).

The medial rectus attaches to the anterolateral surfaceof the eye and pulls it medially (ADDUCTION)

The lateral rectus attaches to the posterior surface of the eye and pulls it laterally (ABDUCTION).

4. When your right eye looks to the right, which extrinsic eye muscle is contracted?

The inferior rectus

The lateral recuts, attached to the anterolateral surface of the eye is contracted and pulls eye laterally. It is used to make your right eye look to the right (ABDUCTION)

The superior oblique

The medial rectus

The other options do not control the movement of the eye towards the right as specified in the question.

Explanation

The other options do not control the movement of the eye towards the right as specified in the question.

5. What is the location and function of the inferior rectus muscle?

The superior rectus muscle attaches to the posteroinferior part of the sclera and pulls the eye superiorly and medially.

The lateral rectus muscle attaches to the anterosuperior part of the sclera and pulls the eye laterally.

The inferior rectus attaches to the anteroinferior part of the sclera and pulls the eye inferiorly and medially. i.e when you look down i.e when you look at your nose

The medial rectus muscle attaches to the anteroinferior part of the sclera and pulls the eye superiorly and medially.

The inferior rectus muscle is responsible for downward and inward eye movements, such as when looking at your nose.

Explanation

The inferior rectus muscle is responsible for downward and inward eye movements, such as when looking at your nose.

6. Which muscle pulls the eye superiorly and slightly medially?

The lateral rectus

The superior rectus (just as the inferior rectus) does not pull directly parallel to the long axis resulting in its slight medial pull

The medial rectus

The inferior oblique

The superior rectus muscle is responsible for pulling the eye superiorly and slightly medially. It does not pull directly parallel to the long axis, resulting in its slight medial pull.

Explanation

The superior rectus muscle is responsible for pulling the eye superiorly and slightly medially. It does not pull directly parallel to the long axis, resulting in its slight medial pull.

7. Label this diagram.

B.

C.

1.

A.

This multiple-choice question is asking the test taker to correctly label a diagram with the corresponding option. Option 1 is the correct answer, while options A, B, and C are incorrect choices to mislead the test taker.

Explanation

This multiple-choice question is asking the test taker to correctly label a diagram with the corresponding option. Option 1 is the correct answer, while options A, B, and C are incorrect choices to mislead the test taker.

8. Which muscle elevates the posterior part of the eye and turns the eye laterally?

The superior oblique depresses the eye and turns it laterally. It passess through a pulley-like loop called the trochlea

The inferior rectus elevates the eye and turns it laterally.

The lateral rectus elevates the eye and turns it medially.

The superior rectus depresses the eye and turns it medially.

The correct answer is that the superior oblique muscle depresses the eye and turns it laterally, passing through the trochlea. The other muscles mentioned have different functions in eye movement.

Explanation

The correct answer is that the superior oblique muscle depresses the eye and turns it laterally, passing through the trochlea. The other muscles mentioned have different functions in eye movement.

9. What is the location and function of the inferior oblique muscle?

The inferior oblique muscle is located in the nasal part of the eye and its function is to adduct the eye.

The inferior oblique muscle is located in the temporal part of the eye and its function is to depress the eye.

The inferior oblique muscle is located in the superior part of the eye and its function is to abduct the eye.

The inferior oblique elevates eye. Located at inferior posterior part of eye. Contracting the muscle pulls the posterior part inferior

The inferior oblique muscle is responsible for elevating the eye and is positioned in the inferior posterior part of the eye. It is important for maintaining proper eye movement and position.

Explanation

The inferior oblique muscle is responsible for elevating the eye and is positioned in the inferior posterior part of the eye. It is important for maintaining proper eye movement and position.