Where does Abducens Decussate?
Once the nerve bundles begin to approach the superior medullary velum, they begin to converge. The fibers subsequently decussate prior to emerging from the dorsal aspect of the brainstem at the superior medullary velum. Therefore each superior oblique muscle is innervated by the contralateral CN IV nucleus.
Which cranial nerve is contralateral?
Contralateral and Unilateral Innervation
| Nerve | Innervation |
|---|---|
| Facial (VII) | Mixed bilateral symmetry and contralateral innervation |
| Glossopharyngeal (IX) | Neither bilateral symmetry or contralateral innervation* |
| Vagus (X) | Bilateral symmetry |
| Spinal accessory (XI) | Contralateral innervation |
Where does the abducens nerve innervate?
lateral rectus muscle
The abducens nerve functions to innervate the ipsilateral lateral rectus muscle and partially innervate the contralateral medial rectus muscle (at the level of the nucleus – via the medial longitudinal fasciculus).
Does the abducens nerve Decussate?
The abducens nerve (or abducent nerve) is the sixth cranial nerve (CNVI), in humans, that controls the movement of the lateral rectus muscle, responsible for outward gaze. It is a somatic efferent nerve….
| Abducens nerve | |
|---|---|
| From | abducens nucleus |
| Innervates | lateral rectus muscle |
| Identifiers | |
| Latin | nervus abducens |
How does the abducens nerve move the eye?
The function of the abducens nerve is quite simple and straightforward: It moves the eye outward (abduction) so you can look to the side. Via the contralateral medial rectus muscle, it coordinates the simultaneous side-to-side movement of your eyes.
What does the hypoglossal nerve do?
The hypoglossal nerve enables tongue movement. It controls the hyoglossus, intrinsic, genioglossus and styloglossus muscles.
Is Abducens sensory or motor?
The trochlear, abducens, accessory, and hypoglossal nerves are only motor nerves; the trigeminal nerve is both sensory and motor; the oculomotor nerve is both motor and parasympathetic; the facial glossopharyngeal, and vagus nerves have sensory, motor, and parasympathetic components (Standring, 2008).
What type of nerve is the abducens nerve?
somatic motor nerve
The abducens nerve is a purely somatic motor nerve, It has no sensory function. It innervates the lateral rectus muscle, an extraocular muscles of the eye, which is responsible for the abduction of the eyes on the same (ipsilateral) side.
What does hypoglossal nerve do?
The hypoglossal nerve enables tongue movement. It controls the hyoglossus, intrinsic, genioglossus and styloglossus muscles. These muscles help you speak, swallow and move substances around in your mouth.
Is the abducens nerve sensory or motor?
Is the Abducens nerve sensory or motor?
What is the abducens nerve?
The abducens nerve, sometimes called the abducent nerve, is responsible for the movement of the lateral rectus muscle, which allows your eye to rotate away from the center of your body and look to the left or right. The abducens is the sixth cranial nerve (CN VI). This nerve has only a motor function and is lacking a sensory function.
What is the pathophysiology of abducens palsy?
Damage or disruption to the abducens nerve anywhere along its long intracranial course (the sixth nerve has the longest intracranial course of all the cranial nerves) can result in a palsy. The nerve begins at its nucleus in the dorsal pons and courses superiorly and then anteriorly before leaving the brainstem at the pontomedullary junction.
Where does the abducens enter the sinus?
The abducens travels forward in the cavernous sinus on the medial side of the ophthalmic nerve and shifts laterally below the nasociliary nerve as it passes through the inferomedial part of the SOF and annular tendon to enter the medial surface of the lateral rectus muscle.
Where does the abducens nerve enter the dural Porus?
The abducens nerve enters the dural porus of the abducens and Dorello’s canal located medial and inferior to the porus of the trigeminal nerve. The Inferior Petrosal Sinus courses medial to the abducens nerve. C: Anterior view of the brainstem.