trochlear nerve is what
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Trochlear nerve Trochlear nerve. From Wikipedia, the free encyclopedia. The trochlear nerve, also called the fourth cranial nerve or cranial nerve 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.he trochlear nerve is unique among the cranial nerves in several respects: 1  It is the smallest nerve in terms of the number of axons it contains. 2  It has the greatest intracranial length.
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- Oculomotor nerve: The third cranial nerve. The oculomotor nerve is responsible for the nerve supply to muscles around the eye, including the upper eyelid muscle, which raises the eyelid; the extraocular muscle, which moves the eye inward; and the pupillary muscle, which constricts the pupil.culomotor nerve: The third cranial nerve. The oculomotor nerve is responsible for the nerve supply to muscles around the eye, including the upper eyelid muscle, which raises the eyelid; the extraocular muscle, which moves the eye inward; and the pupillary muscle, which constricts the pupil.
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Auditory Nerve Damage The auditory nerve is composed of two parts. The cochlea located in the inner ear has tiny nerve cells responsible for transmitting sounds from the middle ear. The second part of the auditory nerve is the auditory nerve also referred to as the vestibulocochlear nerve or the eighth cranial nerve.
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- medical Definition of trochlea : an anatomical structure resembling a pulley: as a: the articular surface on the medial condyle of the humerus that articulates with the ulna
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Optic nerve For other uses, see Optic Nerve. The optic nerve, also known as cranial nerve II, is a paired nerve that transmits visual information from the retina to the brain. The optic nerve is derived from optic stalks during the seventh week of development and is composed of retinal ganglion cell axons and glial cells.
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Petrosal nerves Petrosal nerves. Petrosal nerve (a nerve traveling through the petrous portion of the temporal bone) may refer to: Deep petrosal nerve. Greater petrosal nerve (also known as the greater superficial petrosal nerve) Lesser petrosal nerve (also known as the lesser superficial petrosal nerve)
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Cranial Nerves That Affect the Eye Cranial Nerve 4. This is the trochlear nerve, which stimulates one of the eye muscles; namely, the superior oblique muscle. If this nerve has been damaged, when you move your eye to look towards your nose, you will not be able to move your eye downwards. Walking downstairs will give you double vision.
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Cochlear nucleus Auditory nerve fibers, fibers that travel through the auditory nerve (also known as the cochlear nerve or eighth cranial nerve) carry information from the inner ear, the cochlea, on the same side of the head, to the nerve root in the ventral cochlear nucleus.
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Chorda tympani The chorda tympani is a branch of the facial nerve that originates from the taste buds in the front of the tongue, runs through the middle ear, and carries taste messages to the brain.he chorda tympani appears to exert a particularly strong inhibitory influence on other taste nerves, as well as on pain fibers in the tongue.
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Vestibulocochlear nerve The vestibulocochlear nerve is responsible for both hearing and balance and brings information from the inner ear to the brain. A human's sense of equilibrium is determined by this nerve. Two special organs help the nerve function properly: the cochlea and the vestibular apparatus.his group includes all the nerves that emerge from the cranium (skull), as opposed to those that emerge from the vertebral column (spinal cord). It is a paired set of nerves (one from each ear) and the nerve is located in the internal auditory canal, a part of the skull's temporal bone.
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- Greater petrosal nerve. The greater (superficial) petrosal nerve (also known as the large superficial petrosal nerve) is a nerve in the skull that branches from the facial nerve; it forms part of a chain of nerves that innervate the lacrimal gland. The fibres have synapses in the pterygopalatine ganglion (also known as the sphenopalatine ganglion).
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Vestibulocochlear nerve effect on sound reception. in human ear: Auditory nerve fibres. The vestibulo cochlear nerve consists of two anatomically and functionally distinct parts: the cochlear nerve, which innervates the organ of hearing, and the vestibular nerve, which innervates the organs of equilibrium.
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What is the function of trochlear nerve? Without the use of the nerve, the superior oblique eye muscle will no longer function properly. The muscle, not the trochlear nerve, is what physically moves the eyeball. Double vision, otherwise known as diplopia, results from problems with either the muscle or the nerve.t serves the superior oblique eye muscle and connects to the annular tendon. As a result, it processes brain signals to move the eyes up and down, and also outwards. Whether due to a head injury or a complication of surgery, damage to this nerve will compromise some ability to use the superior oblique eye muscle.
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Cranial Nerves - Anatomy & Physiology Cranial nerves related to the innervation of the head muscles include the oculomotor, trochlear, abducens and the hypoglossal nerves. Cranial nerves related to innervation of structures originating from branchial arches include the trigeminal, facial, glossopharyngeal, vagus and accessory nerves.
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Cranial Nerves - Anatomy & Physiology The vagus nerve is part of the group of cranial nerves responsible for innervation of structures derived from the branchial arches. It is also part of a group together with the glossopharyngeal and accessory nerves that passes through the jugular foramen which is termed the vagus group.ranial nerves related to the innervation of the head muscles include the oculomotor, trochlear, abducens and the hypoglossal nerves. Cranial nerves related to innervation of structures originating from branchial arches include the trigeminal, facial, glossopharyngeal, vagus and accessory nerves.
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The Cranial Nerve Exam Together with the abducens nerve, the sixth cranial nerve, the trochlear nerve helps the eye move in a lateral (toward the midline) direction. The trochlear nerve controls the superior oblique muscle, which is one of the six extraocular muscles that influence eye movement.f the trochlear nerve is harmed, a condition called trochlear nerve palsy (or fourth nerve palsy) may result. This condition causes the affected eye to rotate upwards and towards the midline when the person is looking straight ahead.
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The Facial Nerve (CN VII) Special Sensory Functions. The chorda tympani branch of the facial nerve is responsible for the taste innervation of the anterior 2/3 of the tongue. The nerve arises in the facial canal, and travels across the bones of the middle ear, exiting via the petrotympanic fissure, and entering the infratemporal fossa.Here, the chorda tympani ‘hitchhikes’ with the lingual nerve.he other symptoms produced depend on the location of the lesion, and the branches that are affected: 1  Chorda tympani – reduced salivation and loss of taste on the ipsilateral 2/3 of the tongue. 2  Nerve to stapedius – ipsilateral hyperacusis (hypersensitive to sound).
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- drome, the trochlea is seldom exposed by the strabis­ mus surgeon, and its anatomy has not been adequately described.3 In some younger patients with third nerve palsy, the trochlea is fractured in order to free the superior oblique tendon for transfer to the site of the medical rectus muscle insertion. However, this procedure is
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Trigeminal Neuralgia: Tips & Advice Trigeminal neuralgia, or tic douloureux, is a condition that affects the trigeminal nerve. That is the fifth cranial nerve, and one of the largest nerves in the head. The trigeminal nerve is responsible for sending impulses of touch, pain, pressure, and temperature to the brain.
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The 12 Most Likely Causes of Facial Numbness Trigeminal neuralgia (TN), also called tic douloureux, is a chronic pain condition that affects the trigeminal or 5th cranial nerve, one of the most widely distributed nerves in the head.rigeminal neuralgia (TN), also called tic douloureux, is a chronic pain condition that affects the trigeminal or 5th cranial nerve, one of the most widely distributed nerves in the head.
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The 12 Cranial Nerves Cranial Nerve IV: The Trochlear Nerve Stemming from the lateral superior margin of the left and right side of the pons, exiting the skull through the superior orbital fissure and terminating in the superior oblique eye muscle, this nerve motorically governs the abduction, depression and internal rotation of the eye.
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What is the cochlea? The Cochlea is a part of the ear that turns the vibrations in the small bones into electrical information. The electrical information is channeled through the nerves, into the … brain.. The Cochlea is a part of the ear that turns the vibrations in the small bones into electrical information. The electrical information is channeled through the nerves, into the… brain..  The electrical information is channeled through the nerves, into the … brain..
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The Olfactory Nerve (CN I) The olfactory nerve is the shortest cranial nerve and is the nerve which transmits special sensory information, allowing us to have a sense of smell. It is one of two nerves that do not join with the brainstem, the other being the optic nerve.he olfactory nerve is the shortest cranial nerve and is the nerve which transmits special sensory information, allowing us to have a sense of smell. It is one of two nerves that do not join with the brainstem, the other being the optic nerve.
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Vestibulocochlear nerve The vestibulocochlear nerve (sometimes referred to as the auditory nerve) is the eighth of twelve cranial nerves.This group includes all the nerves that emerge from the cranium (skull), as opposed to those that emerge from the vertebral column (spinal cord).It is a paired set of nerves (one from each ear) and the nerve is located in the internal auditory canal, a part of the skull's temporal bone.his group includes all the nerves that emerge from the cranium (skull), as opposed to those that emerge from the vertebral column (spinal cord). It is a paired set of nerves (one from each ear) and the nerve is located in the internal auditory canal, a part of the skull's temporal bone.
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Cranial Nerves - Anatomy & Physiology The trochlear nerve is part of the cranial nerve group responsible for innervation of the muscles of the head. The trochlear nerve originates from the dorsal mid-brain and is a motor nerve. It is composed of general somatic efferent fibres and is the smallest of the cranial nerves.
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- The trochlear nerve (cranial nerve IV) emerges from the dorsal midbrain near the inferior colliculus. 2.1. Level of the Inferior Colliculus. In the study of neuroanatomy, axial sectioning of the midbrain is commonly performed at the inferior colliculus . The inferior colliculus nuclei represent a triad of gray matter nuclei within the inferior collicular eminences, which play a significant role in the auditory pathway.