vestibulo-ocular reflex

vestibulo-ocular reflex

      eye (eye, human) movement that functions to stabilize gaze by countering movement of the head. In VOR the semicircular canals of the inner ear measure rotation of the head and provide a signal for the oculomotor nuclei of the brainstem, which innervate the eye muscles (muscle). The muscles counter-rotate the eyes in such a way that a rightward head rotation causes an equal leftward rotation of both eyes, with the result that gaze direction stays stationary.

      VOR works in conjunction with the optokinetic reflex (OKR), which is a feedback mechanism that ensures that the eye moves in the same direction and at almost the same speed as an image. Together, VOR and OKR keep the image stationary on the retina, with VOR compensating for fast movements and OKR for slower ones.

Michael Land
 

* * *


Universalium. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Vestibulo-ocular reflex — The vestibulo ocular reflex. A rotation of the head is detected, which triggers an inhibitory signal to the extraocular muscles on one side and an excitatory signal to the muscles on the other side. The result is a compensatory movement of the… …   Wikipedia

  • vestibulo-ocular reflex — [vɛˌstɪbjʊləʊ ɒkjʊlə] noun the reflex by which the direction of the eyes remains constant when the head is moved …   English new terms dictionary

  • Reflex — For other uses, see Reflex (disambiguation). A reflex action, also known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus.[1] A true reflex is a behavior which is mediated via the reflex arc; this does… …   Wikipedia

  • Vestibulo-oculomotor fibers — Infobox Brain Name = PAGENAME Latin = GraySubject = GrayPage = Caption = Caption2 = IsPartOf = Components = Artery = Vein = BrainInfoType = ancil BrainInfoNumber = 409 MeshName = MeshNumber = DorlandsPre = DorlandsSuf = The vestibulo oculomotor… …   Wikipedia

  • Pupillary reflex — refers to one of the reflexes associated with pupillary function. Types include: Pupillary light reflex Accommodation reflex Although pupillary dilation is not usually called a reflex , it is still usually considered a part of this topic.… …   Wikipedia

  • Cushing reflex — (also referred to as the vasopressor response, the Cushing effect, the Cushing reaction, the Cushing phenomenon, the Cushing response, or Cushing s Law) is a physiological nervous system response to increased intracranial pressure (ICP) that… …   Wikipedia

  • Stretch reflex — The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. When a muscle lengthens, the muscle spindle is… …   Wikipedia

  • Mammalian diving reflex — The mammalian diving reflex is a reflex in mammals which optimizes respiration to allow staying underwater for extended periods of time. It is exhibited strongly in aquatic mammals (seals,[1] otters, dolphins, etc.), but exists in a weaker… …   Wikipedia

  • Withdrawal reflex — The withdrawal reflex (nociceptive or flexor withdrawal reflex) is a spinal reflex intended to protect the body from damaging stimuli.[1] It is polysynaptic, causing stimulation of sensory, association, and motor neurons.[1] Contents 1 Example …   Wikipedia

  • Crossed extensor reflex — The crossed extensor reflex is a withdrawal reflex. When the reflex occurs the flexors in the withdrawing limb contract and the extensors relax, while in the other limb, the opposite occurs. [1] An example of this is when a person steps on a nail …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”