what does the trochlear nerve do
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Medical Definition of Trochlear nerve Trochlear nerve: The nerve that controls the superior oblique muscle of the eye, one of the muscles that move the eye (extraocular muscles). Paralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, in double vision).The trochlear nerve is the fourth cranial nerve, and it is the only cranial nerve that arises from the back of the brain stem.aralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, in double vision). The trochlear nerve is the fourth cranial nerve, and it is the only cranial nerve that arises from the back of the brain stem.
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Trochlear nerve The 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. 3  It is the only cranial nerve that exits from the dorsal (rear) aspect of the brainstem.he trochlear nerve carries axons of type GSE, general somatic efferent, which innervate skeletal muscle of the superior oblique muscle. The superior oblique muscle ends in a tendon that passes through a fibrous loop, the trochlea, located anteriorly on the medial aspect of the orbit.
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CRANIAL NERVES The facial (VII) nerve is responsible for salivation, tearing, taste, and sensation in the ear. An appropriate assessment technique for this cranial nerve would include observing for symmetry while the patient performs facial movements: smiles, whistles, elevates eyebrows, and frowns.
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- The oculomotor nerve is the third cranial nerve. It enters the orbit via the superior orbital fissure and innervates muscles that enable most movements of the eye and that raise the eyelid.ince the oculomotor nerve controls most of the eye muscles, it may be easier to detect damage to it. Damage to this nerve, termed oculomotor nerve palsy is also known by the down 'n out symptoms, because of the position of the affected eye (lateral, downward deviation of gaze).
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Stair Calculator Rise/Riser: The rise, or height of a step is measured from the top of one tread to the top of the next tread. It is not the physical height of the riser because this excludes the thickness of the tread. The number of risers, not the number of treads, is used to determine the number of steps that comprise a staircase. Building codes generally suggest that the maximum height of a riser be 7.75 inches (19.7 cm)
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nerve and their functions. The cranial nerves are the 12 pairs of nerves that leave the brain via their own individual apertures in the skull. 1  I Olfactory (Smell). 2  II Optic (Sight). 3  III Oculomotor (Moves eyelid and eyeball and adjusts the pupil and lens of the eye). 4  IV Trochlear (Moves eyeballs).
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Muscles, Nerves, and Blood Vessels of the Eyes Several muscles working together move the eye, allowing people to look in different directions without moving their head. Each eye muscle is stimulated by a specific cranial nerve. The optic nerve (a cranial nerve), which carries impulses from the retina to the brain, as well as other cranial nerves, which transmit impulses to each eye muscle, travel through the orbit (the bony cavity that surrounds the eyeball).
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- Confidence votes 625. There are three cranial nerves that innervates muscle to move the eye. The main cranial nerve that controls eye movement is occulomotor nerve (CN III). It is responsible for inferior rectus, superior rectus, medial rectus, and inferior oblique.Lateral rectus muscle is innervated by abducens nerve (CN VI).he main cranial nerve that controls eye movement is occulomotor nerve (CN III). It is responsible for inferior rectus, superior rectus, medial rectus, and inferior oblique.
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Vestibulocochlear nerve Vestibulocochlear nerve. The vestibulocochlear nerve (auditory vestibular nerve), known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain. Contents.
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Cranial nerves The cranial nerves provide motor and sensory innervation mainly to the structures within the head and neck. The sensory innervation includes both general sensation such as temperature and touch, and special innervation such as taste, vision, smell, balance and hearing
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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.rigeminal nerve (V). The trigeminal nerve is part of the cranial nerve group responsible for innervation of structures originating from branchial arches. The trigeminal nerve nuclei is in the area of the pons and medulla oblongata and is the nerve of the 1st branchial arch.
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Cranial Nerves and their functions List of the Cranial Nerves. 1  I Olfactory (Smell) 2  II Optic (Sight) 3  III Oculomotor (Moves eyelid and eyeball and adjusts the pupil and lens of the eye) 4  IV Trochlear (Moves eyeballs) 5  V Trigeminal (Facial muscles incl. chewing; Facial sensations) 6  VI Abducens (Moves eyeballs) 7  VII Facial (Taste, tears, saliva, facial expressions)
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- Click to read more below. The vestibulocochlear nerves, cranial nerve VIII, are the eighth pair of cranial nerves and are numbered with the Roman numeral VIII. They are sensory nerves that run from the brain stem between the base of the brain (pons) and the spinal cord in an area known as the medulla oblongata.lick to read more below. The vestibulocochlear nerves, cranial nerve VIII, are the eighth pair of cranial nerves and are numbered with the Roman numeral VIII. They are sensory nerves that run from the brain stem between the base of the brain (pons) and the spinal cord in an area known as the medulla oblongata.
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- Twelve pairs of cranial nerves transmit from special sensory receptors information on the senses of balance, smell, sight, taste, and hearing. Cranial nerves also carry information from general sensory receptors in the body, mostly from the head region.
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The Extraocular Muscles When the trochlear nerve (cranial nerve IV) is damaged, a palsy of the superior oblique muscle may occur. Typically, this will resut in an excyclotorsion (outward rotation), along with a lesser hypertropia and esotropia (upward and inward movement) of the affected eye.hen the abducens nerve (cranial nerve VI) is damaged, a palsy of the lateral rectus (LR) muscle may occur, resulting in an esotropia of the affected eye. That eye generally will not be able to look outward past the midline, and it will be somewhat turned inward when the other eye is fixating straight ahead.
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Medical Definition of Cranial nerve IV Nerve, trochlear: The trochlear nerve controls the superior oblique muscle of the eye, one of the extraocular muscles, the muscles that move the eye.Paralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, double vision).The trochlear nerve is the fourth cranial nerve.(The twelve cranial nerves emerge from or enter the skull as opposed to the spinal nerves which emerge from the vertebral column). The trochlear nerve is the only cranial nerve that arises from the back of the brain stem.he trochlear nerve is the fourth cranial nerve. (The twelve cranial nerves emerge from or enter the skull as opposed to the spinal nerves which emerge from the vertebral column). The trochlear nerve is the only cranial nerve that arises from the back of the brain stem.
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Cranial Nerves - Anatomy & Physiology The vestibulocochlear nerve is part of the special senses group of cranial nerves and is made up of two components; the vestibular nerve and the cochlear nerve. The vestibular nerve is responsible for balance whilst the cochlear nerve is responsible for hearing.
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Trochlear nerve Trochlear nerve. The trochlear nerve,[help 1] 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.
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Cranial Nerves of the Face and Mouth: Motion and Sensation Functionality Let's review what the cranial nerves do one more time. The facial nerve, also known as cranial nerve VII, is the most important nerve controlling muscles of facial expression. It is responsible for the sensation of taste in the anterior two-thirds of your mouth.et's review what the cranial nerves do one more time. The facial nerve, also known as cranial nerve VII, is the most important nerve controlling muscles of facial expression. It is responsible for the sensation of taste in the anterior two-thirds of your mouth.
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Trochlear Headache: A Rare, Specific 'Eye-strain' Headache The tendon of the trochlear nerve sits in the trochlea, a saddle or pulley-like cartilaginous structure that is located in the superomedial orbit. Inflammation of the trochlea, trochleitis, produces swelling and tenderness, presenting as a unilateral periorbital pain, a headache referable to the trochlear apparatus. Trochleitis can be idiopathic or secondary to inflammatory or autoimmune connective tissue disorders.
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What is the function of trochlear nerve? It 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.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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Auditory Nerve It is a nerve in the head that transmits electrochemical signals that are transduced inside the cochlea of the inner ear and carrying them to the brain stem. This cranial nerve is the auditory component of the vestibule-cochlear nerve.
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Trochlear nerve The 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.3  It is the only cranial nerve that exits from the dorsal (rear) aspect of the brainstem.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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Cranial Nerves CN IV (name, function, S/M/B, cranial entrance/exit). Name: Trochlear nerve Func: moves eyeball inferiorly and laterally (SO4) S/M/B: Motor Exit: superior orbital fissure (only nerve to emerge dorsally from midbrain).   .
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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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The Names, Functions, and Locations of Cranial Nerves Function of Cranial Nerves. 1  Olfactory Nerve: Sense of smell. 2  Optic Nerve: Vision. 3  Oculomotor Nerve: Eyeball and eyelid movement. 4  Trochlear Nerve: Eye movement. 5  Trigeminal Nerve: This is the largest cranial nerve and is divided into three branches consisting of the ophthalmic, maxillary and mandibular nerves.