Two of those muscles, the superior and inferior rectus, move the eye up and down when the eye is rotated away from the nose. When the eye is turned toward the nose, the inferior oblique muscle is responsible for elevating the eye, turning the top of it away from the nose, and moving it outward..
Regarding this, how do you test for inferior oblique?
To test superior rectus from the inferior oblique, the clinician asks the patient to first look out (or lateral) to orient the visual gaze axis perpendicular to the inferior oblique muscle fiber direction, then up. After the inferior oblique is trapped, the only muscle that can mediate elevation is the superior rectus.
Secondly, what is the action of the inferior oblique muscle? Function. Its actions are extorsion, elevation and abduction of the eye. Primary action is extorsion (external rotation); secondary action is elevation; tertiary action is abduction (i.e. it extorts the eye and moves it upward and outwards). The field of maximal inferior oblique elevation is in the adducted position.
Simply so, what does the superior oblique muscle do?
The superior oblique muscle, or obliquus oculi superior, is a fusiform muscle originating in the upper, medial side of the orbit (i.e. from beside the nose) which abducts, depresses and internally rotates the eye. It is the only extraocular muscle innervated by the trochlear nerve (the fourth cranial nerve).
Where does the inferior oblique muscle originate?
The inferior oblique originates from the maxillary bone, from the medial part of the floor of the orbit and inserts into the posterior, inferior, and lateral surface of the eyeball. The actions of the inferior oblique include extortion (external rotation), elevation and abduction of the eye.
Related Question Answers
What is inferior oblique myectomy?
Myectomy. Inferior oblique myectomy typically involves the surgical removal of a segment of muscle between the NFVB and the insertion of the muscle. The inferior oblique recession is advantageous because it is a more tailored weakening procedure based on the degree of overaction.Is the inferior oblique muscle vertical or horizontal?
When the eye is adducted, the oblique muscles are the prime vertical movers. Elevation is due to the action of the inferior oblique muscle, while depression is due to the action of the superior oblique muscle. The oblique muscles are also primarily responsible for torsional movements.Where are the extraocular muscles located?
The Extraocular Muscles. The extraocular muscles are located within the orbit, but are extrinsic and separate from the eyeball itself. They act to control the movements of the eyeball and the superior eyelid.Which eye muscle sends its tendon of origin?
Extraocular Muscles The inferior oblique is the only extraocular muscle to have its anatomic origin in the anterior orbit. The muscle runs from the medial corner of the orbit to the lateral aspect of the globe, its length approximately paralleling the tendon of insertion of the superior oblique muscle.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.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.How do you test for extraocular movement?
Check extraocular movements (eye movements) by having the patient look in all directions without moving their head and ask them if they experiences any double vision. Test smooth pursuit by having the patient follow an object moved across their full range of horizontal and vertical eye movements.What is Intorsion?
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.How do you test the function of the superior oblique muscle?
Examination of Cranial Nerve IV The superior oblique muscle, therefore, originates functionally from the trochlea at the superior medial orbital rim and inserts on the top of the globe behind its equator. When the eye is in adduction, this muscle exerts a more or less direct downward pull and depresses the eye.What are oblique eyes?
The superior oblique is a fusiform (spindle-shaped) muscle belonging to the extraocular group of muscles. It originates near the nose. Along with the other extraocular muscles, it performs the role of controlling eye movements. This muscle's movement of the eye downward is most effective when the eye is abducted.What does the Trochlear do?
The trochlear nerve, also called the fourth cranial nerve or CN IV, is a motor nerve (a somatic efferent nerve) that innervates only a single muscle: the superior oblique muscle of the eye, which operates through the pulley-like trochlea.What causes superior oblique palsy?
A common cause of acquired superior oblique palsy is head trauma, including relatively minor trauma. A concussion or whiplash injury from a motor vehicle accident may be sufficient enough to cause the problem. Rare causes of superior oblique palsy are stroke, tumor and aneurysm.How does the superior oblique muscle move the eye?
The muscle crosses the eyeball posterior to the superior-inferior axis of the eyeball between it and the superior rectus muscle. Based on its attachments, the superior oblique depresses about the lateral-medial axis, abducts about the superior-inferior axis and intorts about the visual gaze axis.What is the shortest extraocular muscle?
inferior oblique
What are the muscles of 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.What does the inferior rectus muscle 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.What muscle passes through the Trochlea?
superior oblique muscle
What is the common tendinous ring?
The annulus of Zinn, also known as the annular tendon or common tendinous ring, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit. It is the common origin of the four rectus muscles (extraocular muscles).What is internal oblique?
The internal oblique is an abdominal muscle located beneath the external abdominal oblique. The internal abdominal oblique muscle ends at the bottom edge of the rib cage, the rectus sheath (fibrous tissue that covers the abdominal muscles), and the pubic crest (an area in the lower-front of the pelvis). 
