How many nuclei does abducens nerve have?
The nerve can be divided into four distinct portions: the nucleus, the cisternal portion, the cavernous sinus portion, and the orbital portion. The abducens nucleus resides in the dorsal pons, ventral to the floor of the fourth ventricle, and just lateral to the medial longitudinal fasciculus.
Where is the nucleus of abducens nerve?
The abducens nucleus is located internal to the facial colliculus and surrounded by the internal genu of the facial nerve (Fig. 14.1). This structure, in turn, is found in the floor of the rhomboid fossa just lateral to the median sulcus and rostral to the striae medullares of the fourth ventricle.
What is the abducens nucleus?
The abducens nucleus consists of motor neurons, interneurons, and a small percentage of neurons projecting to the cerebellar flocculus. Signaling pathways through the nucleus allow for gaze holding and conjugate horizontal gaze during the vestibulo-ocular reflex and for the generation of saccades.
Which part of the brain does the abducens nerve emerge?
The abducens nerve leaves the brainstem at the junction of the pons and the medulla, medial to the facial nerve. In order to reach the eye, it runs upward (superiorly) and then bends forward (anteriorly). The nerve enters the subarachnoid space when it emerges from the brainstem.
Which Foramina do the abducens nerves pass through?
Cranial Nerve Review Table
| Cranial Nerve | Foramen |
|---|---|
| VI-Abducens | superior orbital fissure |
| VII-Facial (Major motor branches: Temporal, Zygomatic, Buccal, Mandibular, Cervical, and Posterior Auricular) | internal acoustic meatus-> facial canal-> stylomastoid foramen |
| facial canal-> middle ear-> chorda tympani-> petrotympanic fissure |
What are the vestibular nuclei?
The vestibular nuclei are located in the medulla and pons of the hindbrain. It is a complex composed of four major nuclei that integrate information from the primary vestibular afferents, contralateral nuclei, somatosensory organs, and the cerebellum.
Which Foramina do the Abducens nerves pass through?
Is the abducens nerve 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 foramen does the hypoglossal nerve pass through?
The hypoglossal nerve passes through the dura by itself, the ninth, tenth and eleventh nerves pass through the dura together to enter the jugular foramen. Nerves nine, ten and eleven leave through this part of the jugular foramen. The hypoglossal nerve leaves through this opening, the hypoglossal canal.
What are the functions of the abducens nerve?
The abducens nerve is also known as the abducent or sixth cranial nerve (CN6). It controls the eye’s lateral rectus muscle, which moves the eye sideways, away from the nose.
What muscle is innervated by the abducens nerve?
lateral rectus muscle A muscle in the orbit. It is one of six extraocular muscles that control the movements of the eye (abduction in this case) and the only muscle innervated by the abducens nerve, cranial nerve VI, functioning to bring the pupil away from the midline of the body.
Does the abducens nerve help with vision?
The abducens nerve lets you look to the side and helps coordinate the simultaneous side-to-side movement of your eyes. Injury leads to double vision.
What is your abducent nerve?
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 .