Asked by: Joris Baimiev
medical health eye and vision conditions

What is abduction of the eye?

Last Updated: 2nd February, 2020

22
The extraocular muscles execute eye movements and are innervated by three cranial nerves. Contraction of the medial rectus pulls the eye towards the nose (adduction or medial movement). Contraction of the lateral rectus pulls the eye away from the nose (abduction or lateral movement).

Click to see full answer.

In this manner, what does it mean to abduct the eye?

Strabismus is a position of the eyes where they are not directed at the same target (in some parts of the country this is termed a "squint"). Abduction is bringing the pupil away from the nose. Adduction is bringing the pupil toward the nose. Elevation is moving the pupil above the horizon.

Similarly, what are the different actions of the eye? Movements

Muscle Innervation Primary action
Inferior rectus Oculomotor nerve (inferior branch) Depression
Superior oblique Trochlear nerve Incyclotorsion
Inferior oblique Oculomotor nerve (inferior branch) Excyclotorsion
Levator palpebrae superioris Oculomotor nerve Elevation/retraction of the upper eyelid

In respect to this, what is Intorsion of the eye?

Eye Movements. Elevation and depression of the eye are termed sursumduction (supraduction) and deorsumduction (infraduction), respectively. Incycloduction (intorsion) is nasal rotation of the vertical meridian; excycloduction (extorsion) is temporal rotation of the vertical meridian. (See the image below.)

What is the secondary position of the eye?

Secondary positions are up, down, right, and left gaze. These are achieved by pure rotations about the horizontal (x) or vertical (z) axes. Tertiary positions are oblique positions: up and right, up and left, down and right, and down and left [ 4 ].

Related Question Answers

Faride Odin

Professional

How do you check eye muscles?

The test itself is simple. Your eye doctor or technician will ask you to sit up straight while you stare at an object in front of you, which is usually a pen, fixation light, or small picture held 12 and 16 inches away. They will move the object up and down and side to side in an H-shaped pattern.

Usune Balcarlos

Professional

Which part of the brain controls eye movement?

Pons. A deep part of the brain, located in the brainstem, the pons contains many of the control areas for eye and face movements.

Gabor Hermening

Explainer

What is the function of saccadic eye movement?

A saccade (/s?ˈk?ːd/ s?-KAHD, French for jerk) is a quick, simultaneous movement of both eyes between two or more phases of fixation in the same direction. In contrast, in smooth pursuit movements, the eyes move smoothly instead of in jumps.

Malaika Dienelt

Explainer

What does Disconjugate gaze mean?

Definition. Dysconjugate gaze is a failure of the eyes to turn together in the same direction.

Rafaela Robers

Explainer

What does the inferior rectus do?

The inferior rectus muscle is located within the orbit (eye socket). It is one of six muscles that control the movements of the eye. The inferior rectus muscle moves the eyeball downward. It also moves the eye inward towards the nose and rotates the top of the eye away from the nose.

Coralia Andras

Pundit

What are the six muscles in the eye?

Eye muscle anatomy. There are six extraocular muscles that move the globe (eyeball). These muscles are named the superior rectus, inferior rectus, lateral rectus, medial rectus, superior oblique, and inferior oblique.

Jackson Arrizabalaga

Pundit

Do human eyes rotate?

The eyes definitely can “tilt” or rotate to do their best to keep level with gravity/the floor or you can make them align with the direction of the head. There is a maximum they can rotate to keep level beyond which they cannot keep up.

Giovany Bakanov

Pundit

What does Intorsion mean?

Medical Definition of intorsion
: inward rotation (as of a body part) about an axis or a fixed point especially : rotation of the eye around its anteroposterior axis so that the upper part moves toward the nose — compare extorsion.

Disney Freudenthal

Pundit

How can I strengthen my eye muscles?

How to exercise your eyes
  1. Hold your pointer finger a few inches away from your eye.
  2. Focus on your finger.
  3. Slowly move your finger away from your face, holding your focus.
  4. Look away for a moment, into the distance.
  5. Focus on your outstretched finger and slowly bring it back toward your eye.

Enetz Rachidi

Pundit

What are the two main refractive bodies in the eye?

Cornea and lens
The cornea and the lens are the eye's most important refractive structures. Light first passes through the cornea, which has a curved surface.

Oma Verhouven

Teacher

Where is the blind spot located?

The blind spot is the location on the retina known as the optic disk where the optic nerve fiber exit the back of the eye.

Ainhitze Molares

Teacher

What is bad vision?

When the vision in the better eye with best possible glasses correction is: 20/30 to 20/60, this is considered mild vision loss, or near-normal vision. 20/70 to 20/160, this is considered moderate visual impairment, or moderate low vision. 20/200 or worse, this is considered severe visual impairment, or severe low

Darek Paliteiro

Teacher

What is the function of the retina?

The retina is a thin layer of tissue that lines the back of the eye on the inside. It is located near the optic nerve. The purpose of the retina is to receive light that the lens has focused, convert the light into neural signals, and send these signals on to the brain for visual recognition.

Baruc Urdiales

Teacher

What is Hypertropia of the eye?

Hypertropia is a condition of misalignment of the eyes (strabismus), whereby the visual axis of one eye is higher than the fellow fixating eye. Hypotropia is the similar condition, focus being on the eye with the visual axis lower than the fellow fixating eye.

Jammie Szkudiare

Reviewer

Do eyes move together?

The key structure which makes the eyes move together is the medial longitudinal fasciculus (MLF). The MLF is a fiber tract that that connects the abducens (CN VI) nucleus in the pons with the oculomotor (CN III) nucleus in the midbrain.

Corene Gerritzen

Reviewer

Is the eye an organ?

The human eye is an organ that reacts to light and allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The eye is part of the sensory nervous system.

Emanoil Petrosk

Reviewer

What are the three layers of the eye?

Three layers
  • The fibrous tunic, also known as the tunica fibrosa oculi, is the outer layer of the eyeball consisting of the cornea and sclera.
  • The vascular tunic, also known as the tunica vasculosa oculi or the "uvea", is the middle vascularized layer which includes the iris, ciliary body, and choroid.

Josep Chethan

Reviewer

How many veins are in the human eye?

The choriocapillaris lobules drain into venules that join the larger venules of the outer conduit layer that coalesce into the 4-5 vortex veins that pierce the sclera at the equator.

Mirene Oseguera

Supporter

What is the main function of the rods in the eye?

There are two types of photoreceptors in the human retina, rods and cones. Rods are responsible for vision at low light levels (scotopic vision). They do not mediate color vision, and have a low spatial acuity.