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Exterior of labyrinth of the inner ear. Benign paroxysmal positional vertigo ( BPPV) is a disorder arising from a problem in the inner ear. [ 3] Symptoms are repeated, brief periods of vertigo with movement, characterized by a spinning sensation upon changes in the position of the head. [ 1] This can occur with turning in bed or changing ...
Positional alcohol nystagmus. Positional alcohol nystagmus (PAN) is nystagmus (visible jerkiness in eye movement) produced when the head is placed in a sideways position. PAN occurs when the specific gravity of the membrane space of the semicircular canals in the ear differs from the specific gravity of the fluid in the canals because of the ...
Nystagmus can be clinically investigated by using a number of non-invasive standard tests. The simplest one is the caloric reflex test, in which one ear canal is irrigated with warm or cold water or air. The temperature gradient provokes the stimulation of the horizontal semicircular canal and the consequent nystagmus.
The eyes then turn toward the ipsilateral ear, with horizontal nystagmus to the contralateral ear. [5] [6] Absent reactive eye movement suggests vestibular weakness of the horizontal semicircular canal of the side being stimulated. In comatose patients with cerebral damage, the fast phase of nystagmus will be absent as this is controlled by the ...
53401. Anatomical terms of neuroanatomy. [ edit on Wikidata] The vestibular nerve is one of the two branches of the vestibulocochlear nerve (the cochlear nerve being the other). In humans the vestibular nerve transmits sensory information from vestibular hair cells located in the two otolith organs (the utricle and the saccule) and the three ...
The vestibular system, in vertebrates, is a sensory system that creates the sense of balance and spatial orientation for the purpose of coordinating movement with balance. Together with the cochlea, a part of the auditory system, it constitutes the labyrinth of the inner ear in most mammals . As movements consist of rotations and translations ...
The paramedian pontine reticular formation ( PPRF) (also known as paraabducens nucleus) is a subset of neurons of the oral and caudal pontine reticular nuclei mediating horizontal gaze. [ 1] It is situated in the pons adjacent to the abducens nucleus. [ 2] It projects to the ipsilateral abducens (cranial nerve VI) nucleus, and contralateral ...
Anatomical terminology. [ edit on Wikidata] Diagram of a typical long bone showing both cortical (compact) and cancellous (spongy) bone. Haversian canals[ i] (sometimes canals of Havers, osteonic canals or central canals) are a series of microscopic tubes in the outermost region of bone called cortical bone. They allow blood vessels and nerves ...