QRI Cranial Nerves Course
QRI ADV Classes, the Cranial Nerves
The advanced classes support the reflex integration protocol. “If you love your family-work on their cranial nerves.” Dr Gonzales. The cranial nerves originate in the same area as most primitive reflexes and can prevent or delay various reflexes from integrating. I found this info and condensed it for you. If you are new to QRI or feel overwhelmed, do not feel rushed to get the advanced classes.
The cranial nerves are an important collection of nerves, all of which travel directly to the brain rather than through the spinal cord, like most other nerves. The cranial nerves have several functions critical for day-to-day life, so they are an important focus for physicians, as well as patients affected by disorders of cranial nerve function.
The Olfactory Nerve
The olfactory nerve is responsible for transmitting everything we smell to the brain. Disruptions to this nerve can cause anosmia, an inability to detect scents. This also dramatically impacts our sense of taste.
The Optic Nerve
The optic nerve transmits electrical signals from the eye to the brain, which transforms these signals into an image of what we see in the world around us. Disorders of the optic nerve, such as optic neuritis, can lead to visual disturbances and even blindness.
The Oculomotor Nerve
The oculomotor nerve has two main functions. First, the oculomotor nerve transmits signals that allow the eyes to move in every direction not controlled by other cranial nerves. Second, the oculomotor nerve carries parasympathetic fibers to the iris, causing the iris to constrict when you’re in bright light.
The Trochlear Nerve
The trochlear nerve controls a muscle that moves the eyeball down and out. A lesion of this nerve can cause diplopia, which can be improved by tilting the head away from the affected eye.
The Trigeminal Nerve
The trigeminal nerve is primarily a sensory nerve, meaning that it relays sensation from the face to the brain. In addition, the trigeminal nerve controls some facial muscles important for chewing. One of the worst complications of trouble with the trigeminal nerve is trigeminal neuralgia, an extreme form of facial pain.
The Abducens Nerve
This nerve controls the nerve that moves the eye away from the nose. A lesion of the abducens nerve causes double vision, in which one image is directly next to the other. Sometimes the abducens nerve can be impacted on both sides in cases of increased intracranial pressure.
The Facial NerveThe facial nerve is complicated. Not only does it control most muscles of the face; this nerve also transmits taste signals from the front of the tongue, conveys parasympathetic fibers that make the eyes tear and mouth salivate, and is responsible for a little bit of sensation around the ear. It also helps modulate hearing through control of the stapedius muscle.
The Vestibulocochlear Nerve
This nerve has two main components: the cochlear component relays acoustic information to the brain so that we can hear, and the vestibular portion sends signals regarding balance and movement. Problems with the vestibulocochlear nerve, then, can cause either hearing loss or vertigo, and often cause both.
The Glossopharyngeal Nerve
This nerve is responsible for taste from the back of the tongue, the sensation from a small portion of the ear and parts of the tongue and throat, the innervation of one muscle important for swallowing (the stylopharyngeus), and salivation by the parotid gland.
The Vagus Nerve
This nerve controls the pharynx (for swallowing) and larynx (for speaking), as well as sensation from the pharynx, part of the meninges and a small portion of the ear. Like the glossopharyngeal nerve, the vagus nerve detects taste (from the throat) and also detects special signals from chemo and baroreceptors near the heart (in the aortic arch). Furthermore, the vagus nerve relays parasympathetic fibers to the heart, the signals from which can slow the heart’s beating. Because of its relationship to the heart, disorders of the vagus nerve could be very dangerous. On the other hand, stimulation of the vagus nerve has been shown to be potentially useful in a wide array of disorders, including epilepsy.
The Spinal Accessory Nerve
The spinal accessory nerve is less complicated than its immediate predecessors. It only has one main function: to cause the contraction of the sternocleidomastoid muscle and the trapezius in order to help move the head or shoulder. Disorders of this nerve diminish the ability to use these muscles.
The Hypoglossal Nerve
The hypoglossal nerve controls all the movements of the tongue. Difficulty speaking (dysarthria) is one potential consequence of a damaged hypoglossal nerve. #QRIadvclasses #QRIinfo
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