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Sixth nerve palsy, or abducens nerve palsy, is a disorder associated with dysfunction of cranial nerve VI (the abducens nerve), which is responsible for causing contraction of the lateral rectus muscle to abduct (i.e., turn out) the eye. [1]
The abducens nerve controls the movement of a single muscle, the lateral rectus muscle of the eye. In most other mammals it also innervates the musculus retractor bulbi, which can retract the eye for protection. Homologous abducens nerves are found in all vertebrates except lampreys and hagfishes.
Rare cases involve abducens nerve paralysis affects lateral eye movement while trochlear nerve paralysis affects vertical eye movement. [11] Similar to headache, ophthalmoplegia usually resolve gradually and completely over time, but recovery may be incomplete after several episodes. [11]
V 3 (mandibular nerve) is located in the foramen ovale. Receives sensation from the face, mouth and nasal cavity, and innervates the muscles of mastication. VI Abducens: Mainly motor Nuclei lying under the floor of the fourth ventricle Pons. Located in the superior orbital fissure. Innervates the lateral rectus, which abducts the eye. VII Facial
The lateral rectus is the only muscle supplied by the abducens nerve (CN VI). The neuron cell bodies are located in the abducens nucleus in the pons.These neurons project axons as the abducens nerve which exit from the pontomedullary junction of the brainstem, travels through the cavernous sinus and enter the orbit through the superior orbital fissure.
Horizontal gaze specifically also involves the Abducens nerve and the Paramedian pontine reticular formation. [2] Horizontal gaze involves synchronous activation of the abducens muscle of one eye and the medial rectus muscle of the other, via communication through the Medial longitudinal fasciculus. Horizontal gaze palsies can be caused by a ...
As the name suggests, the abducens nerve is responsible for abducting the eye, which it controls through contraction of the lateral rectus muscle. The trochlear nerve controls the superior oblique muscle to rotate the eye along its axis in the orbit medially, which is called intorsion , and is a component of focusing the eyes on an object close ...
Nerves and muscles [ edit ] The three nerves that control the extraocular muscles are the oculomotor , trochlear , and abducens nerves, which are the third, fourth, and sixth cranial nerves. the abducens nerve is responsible for abducting the eye, which it controls through contraction of the lateral rectus muscle .