which cranial nerves are bilaterally innervated?
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CN IX: Glossopharyngeal. Anatomy. CN IX is innervated bilaterally and has sensory, parasympathetic, and motor components. The sensory division receives general sensory fibers from the tonsils, pharynx, middle ear, and the posterior one-third of the tongue, as well as taste fibers from the posterior third of the tongue.
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The lateral surface of the tympanic membrane, the external auditory canal, and the external acoustic meatus are all innervated by nervus intermedius (a branch of CN VII), the auriculotemporal nerve (CN V3), and the auricular branch of the vagus nerve.
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There are three cranial nerves with primarily sensory function. Link to Sensory. Cranial nerve I, Olfactory, modulates smell, cranial nerve II, Optic,modulates vision. Cranial nerve VIII, Acoustovestibular, modulates hearing and balance.
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The hypoglossal nerve is mixed and involved in hearing. The only three cranial nerves that are purely sensory neurons include Olfactory (smell), Optic(sight), and Acoustic (hearing). Cranial nerves that are involved in motor movement only, include Vagus, spinal, hypoglossal, abducens, and trochlear.
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Neurons of the auditory or vestibulocochlear nerve (the eighth cranial nerve) innervate cochlear and vestibular hair cells. ... Inner hair cell nerve fibers are also very heavily myelinated, which is in contrast to the unmyelinated outer hair cell nerve fibers.
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Cranial nerves I, II, and VIII are pure sensory nerves. Cranial nerves III, IV, VI, XI, and XII are pure motor nerves. Cranial nerves V, VII, IX, and X are mixed sensory and motor nerves. The olfactory nerve (CN I) contains special sensory neurons concerned with smell.
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There are three main groups of cranial nerves; special senses, innervation of the head muscles and innervation of structures originating from branchial arches. The special senses cranial nerves include the olfactory, ocular and vestibulocochlear.
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Your cranial nerves are pairs of nerves that connect your brain to different parts of your head, neck, and trunk. There are 12 of them, each named for their function or structure.
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There is one nerve on each side of the head. Emerging from between bones of the spine in the upper neck, the two greater occipital nerves make their way through muscles at the back of the head and into the scalp.
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The cranial nerves emerge from the central nervous system above the level of the first vertebrae of the vertebral column. Each cranial nerve is paired and is present on both sides. There are conventionally twelve pairs of cranial nerves, which are described with Roman numerals I–XII.
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The numbering of the cranial nerves is based on the order in which they emerge from the brain, front to back (brainstem). The terminal nerves, olfactory nerves (I) and optic nerves (II) emerge from the cerebrum or forebrain, and the remaining ten pairs arise from the brainstem, which is the lower part of the brain.
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Cranial nerves are generally named according to their structure or function. For example, the olfactory nerve (I) supplies smell, and the facial nerve (VII) supplies the muscles of the face.
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The eye is lateral to the nose. The nose is medial to the ears. The brachial artery lies medial to the biceps tendon.
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Cranial nerves are the nerves that emerge directly from the brain (including the brainstem). In contrast, spinal nerves emerge from segments of the spinal cord. Cranial nerves relay information between the brain and parts of the body, primarily to and from regions of the head and neck.
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There is one cranial nerve associated with the pons proper, the trigeminal nerve (cranial nerve V). Three other cranial nerves are located at the pontomedullary junction: the abducens nerve (cranial nerve VI), the facial nerve(cranial nerve VII), and the vestibulocochlear nerve (cranial nerve VIII).
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The eye is lateral to the nose. The nose is medial to the ears.
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The midbrain of the brainstem has the nuclei of the oculomotor nerve (III) and trochlear nerve (IV); the pons has the nuclei of the trigeminal nerve (V), abducens nerve (VI), facial nerve (VII) and vestibulocochlear nerve (VIII); and the medulla has the nuclei of the glossopharyngeal nerve (IX), vagus nerve (X), ...