What is abduction of the eyeball?
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What is abduction of the eyeball?
Inferior Oblique (IR) Rotates the top of the eye away from the nose (extorsion) Moves the eye upwards (elevation) Moves the eye outwards (abduction)
Which of the following muscles abducts the eye?
The medial rectus is an adductor, and functions along with the lateral rectus which abducts the eye. These two muscles allow the eyes to move from side to side.
What causes abduction of the eye?
Contraction of the lateral rectus pulls the eye away from the nose (abduction or lateral movement).
What is abduction and adduction in eye?
Eye Movements. Ductions are monocular eye movements. Movement of the eye nasally is adduction; temporal movement is abduction. Elevation and depression of the eye are termed sursumduction (supraduction) and deorsumduction (infraduction), respectively.
Which cranial nerve is responsible for abduction of the eyeball?
Cranial nerve VI
Cranial nerve VI abducts the eye through stimulation of the lateral rectus muscle.
What moves the eyeball?
EXTRAOCULAR MUSCLES: These muscles originate in the eye socket (orbit) and work to move the eye up, down, side to side, and rotate the eye. The superior rectus is an extraocular muscle that attaches to the top of the eye. It moves the eye upward.
What are the muscles for eyeball movement?
Three antagonistic pairs of muscles control eye movements: the lateral and medial rectus muscles, the superior and inferior rectus muscles, and the superior and inferior oblique muscles.
Which cranial nerve is responsible for abduction of the eye?
What is the abduction movement?
In general terms, abduction in the anatomical sense is classified as the motion of a limb or appendage away from the midline of the body. In the case of arm abduction, it is the movement of the arms away from the body within the plane of the torso (sagittal plane).
What are abductions?
Definition of abduct 1 : to seize and take away (a person) by force The girl was abducted by kidnappers. 2 : to draw or spread away (a part of the body, such as a limb or the fingers) from a position near or parallel to the median axis of the body or from the axis of a limb a muscle that abducts the arm.
Which way is adduction?
Adduction is the movement of a body part toward the body’s midline. So, if a person has their arms straight out at the shoulders and brings them down to their sides, it is adduction. For fingers or toes, adduction brings the digits toward the center of the hand or foot.
What controls the movement of the eye?
The brain exerts ultimate control over both voluntary and involuntary eye movement. Three cranial nerves carry signals from the brain to control the extraocular muscles.
Which muscle allows the movement of your eyeball?
Physiology. The four rectus muscles of the eye control the movement of the eye in the cardinal directions. They work against each other to control the movements of the eye in various directions. The first of these muscles, the superior rectus muscle, elevates the eye, allowing the eye to look up.
What does adduction mean?
Adduction: Movement of a limb toward the midline of the body. The opposite of adduction is abduction.
