Influences of semicircular ducts on extraocular muscles.
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Influences of semicircular ducts on extraocular muscles. by Erik Fluur

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Published in Stockholm .
Written in English


  • Eye -- Muscles,
  • Eye -- Movements,
  • Semicircular canals

Book details:

Edition Notes

Statement[Translated by Klas Magnus Lindskog
SeriesActa oto-laryngologica. Supplementum -- 149, Acta oto-laryngologica -- 149
The Physical Object
Pagination46 p.
Number of Pages46
ID Numbers
Open LibraryOL22787432M
LC Control Number59008004

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To capture the extraocular muscles and semicircular canals, a number of anatomical landmarks were taken from images using A mira (Mercury Inc., USA). A three-dimensional reconstruction of the semicircular canals and extraocular muscles of one of the Felis specimens (Cat3) is shown in Fig. by: The extraocular muscles are the six muscles that control movement of the eye and one muscle that controls eyelid elevation (levator palpebrae).The actions of the six muscles responsible for eye movement depend on the position of the eye at the time of muscle ion: Tarsal plate of upper eyelid, eye. The membranous semicircular duct can be thought of as a fluid-filled tube with a partition (the cupula) in the middle (Fig. B).Because the utricles are located medially, compared with the horizontal canals, on each side of the head, the hair cells of the complementary left and right semicircular canals are oppositely polarized. An example is seen in rotational head movements made in the. There are two histological types of endings for the efferent fibers: motor end plates (___) on the bag fibers and there are endings that form extensive networks (___) on the chain fibers. In skeletal muscle, the muscle spindles report muscle length but the relative importance of muscle spindles in extraocular muscle is unclear.

The vestibular system is a ____ sensory system that plays an important role in ____ in association with the vestibular division of CN VIII. In the semicircular ducts, the cupula is deflected by movement of the endolymph in response to angular acceleration (changes in speed of rotation). motor nuclei of extraocular muscles, reticular. Geometry of the semicircular canals and extraocular muscles in rodents, lagomorphs, felids and modern humans Article in Journal of Anatomy (5) December with Reads. the near-orthogonality of their semicircular canals and, therefore, the close alignment of the anatomical and Fig. 1 Three-dimensional representation of the extraocular muscles and semicircular canals of a cat (specimen Cat3). Surface rendering performed using AMIRA (Mercury Inc., USA). (A) Lateral view. (B) Dorsal view. SO, superior. 1. Author(s): Fluur,Erik Title(s): Influences of semicircular ducts on extraocular muscles.[Tr. by Klas Magnus Lindskog. Country of Publication: Sweden Publisher.

A. Basic Anatomy and Function IV. Ocular Motor Systems. i. The Vestibulo-ocular response (VOR) system. Each of the three semicircular canals has a resting firing rate which is increased by angular acceleration (i.e. a rotation of the head) in a particular direction and decreased by acceleration in the opposite direction. The extraocular muscles are innervated at a ratio of nerve fiber to muscle fiber up to 10 times that of skeletal muscle. This difference may allow for more accurate eye movements controlled by an array of systems ranging from the primitive vestibulo-ocular reflex to highly evolved vergence movements. Chapter 5 ORBITAL GEOMETRY ANATOMY OF EXTRAOCULAR MUSCLES. Key Words: muscle planes, fields of action, primary, secondary and tertiary actions, agonist-antagonist pairs, Descartes-Sherrington law of reciprocal innervation. Helpful references: Chapter 9 in Leigh and Zee / Chapter 5, section 1 in Adler Outline V. Orbital Geometry; Anatomy, Morphology, and Mechanics of EOM. semicircular ducts: [TA] three small membranous tubes of the vestibular labyrinth within the bony semicircular canals of the bony labyrinth that form loops of about two thirds of a circle. The three semicircular ducts: anterior semicircular duct [TA] (ductus semicircularis anterior [TA]), lateral semicircular duct [TA] (ductus semicircularis.