Extraocular muscles basic and clinical anatomy lecturio. The orbit, or eye socket, holds the eye and its muscles, nerves, and blood vessels. The superior rectus muscle has its origin on the superior part of the common tendinous ring and the sheath of the optic nerve. Six extraocular muscles extraocular muscle fibers are striated, skeletaltype fibers surgical anatomy of the orbit. The extraocular muscles are located within the orbit, but are extrinsic and separate from the eyeball itself. Ledford, ocular anatomy and physiology, second edition now begins with a jumpstart chapter to overview. Extraocular muscle an overview sciencedirect topics. Chapter 5 orbital geometry anatomy of extraocular muscles. Normal anatomy and anomalies of the rectus extraocular muscles in human. How the extraocular muscles work underaction of the extraocular muscles can be readily explained due to reduced rotation of the globe. Reshma peter anatomy and physiology of extra ocular muscles and its applied aspects 2. Extraocular muscle afferents and visual input interactions in the superior colliculus of the cat. This site is like a library, use search box in the widget to get ebook that you want.
Right lr for right eye abduction synergists muscles of the same eye that move the eye in the same. Observation of clinical strabismus suggests that only cases of excess innervation such as occurs in the yoke muscle of a paretic muscle can legitimately be called overaction. Four of the muscles are arranged at the cardinal points around the eye and are named for. A further pair of muscles, the oblique muscles superior oblique and inferior oblique are angled as the name implies obliquely. View anatomy physiology extraocular muscle ppts online, safely and virusfree. Chapter 68 anatomy and physiology of the extraocular. The extraocular muscles eoms are highly specialized and differ so significantly. Assessment of extraocular muscles position and anatomy by. The extraocular muscles are the six muscles that control movement of the eye and one muscle. Learn anatomy and physiology muscles with free interactive flashcards. Anatomy and physiology of extraocular muscles and applied aspects 1. Movement of the eye within the orbit is accomplished by the contraction of six extraocular muscles that originate from the bones of the orbit and insert into the surface of the eyeball figure 2. Anatomy and physiology of the eye the orbital floor actually comprises bones.
Within the orbit, the eye is suspended by six extraocular muscles four rectus muscles and two oblique muscles, suspensory ligaments, and surrounding orbital fat fig. Anatomy and physiology of the eye download ebook pdf. Twenty seven muscle spindles from six extraocular muscles removed following ocular enucleation from patients aged 58, 76 and 74 years were examined throughout all or most of their length by means of light and electron microscopy using serial transverse sections. In part i the anatomical illustrations and descriptions are largely from whitnalls anatomy of the human orbit and are most excellent. They act to control the movements of the eyeball and the superior eyelid there are seven extraocular muscles the levator palpebrae superioris, superior rectus, inferior rectus, medial rectus, lateral rectus, inferior oblique and superior oblique. With new features and information, ocular anatomy and physiology, second edition is a valuable text for ophthalmic and optometric assistants, training facilities, and practices, as well as. Muscle activity both eyes face forwards and their long axes visual optic axes is located in sagittal plane, parallel with every other and with medial walls of the orbits. Terminologies used for eom agonist any particular eom producing specific ocular movement ex. Assessment of extraocular muscles position and anatomy by 3dimensional ultrasonography. In this article, we shall look at the anatomy of the muscles of mastication their attachments, actions and innervation. Learn muscles eye anatomy physiology with free interactive flashcards. To elucidate the detailed anatomy of the lateral rectus. Dyce km, sack wo, wensing cjg 1996 textbook of veterinary anatomy.
Extraocular muscles differ histologically from most other skeletal muscles in that they are made up of 2 different types of muscle cells. Chapter 9 in leigh and zee chapter 5, section 1 in adler outline v. The extraocular muscles differ significantly from other muscles in the body, including their structural composition, physiological properties, and response to disease1 2 3. Pdf normal anatomy and anomalies of the rectus extraocular. Ocular anatomy and physiology al lens, sheila coyne. The muscles of mastication develop from the first pharyngeal arch. Anatomy, head and neck, eye extraocular muscles statpearls. Choose from 500 different sets of anatomy and physiology muscles flashcards on quizlet. Choose from 500 different sets of muscles eye anatomy physiology flashcards on quizlet. Anatomy and physiology of extraocular muscles and applied. There are a total of four rectus muscles, two oblique muscles, and the standalone levator palpebrae. Click download or read online button to get anatomy and physiology of the eye book now.
Diamond section 1 basic science 549 chapter 68 anatomy and physiology of the extraocular muscles and surrounding tissues brian n. This resource includes descriptions, functions, and problems of the major structures of the human eye. Pulleys limit sideslip movement of the muscles during eye movements and act as the functional origin of the rectus muscles 1518. The extraocular muscles have a denser blood supply, and their connective tissue sheaths are more delicate and richer in elastic fibers than is skeletal muscle. Extraocular musleseom they are six in number four recti. Superior rectus inferior rectus medial rectus lateral rectus two oblique muscles. There also is a test for color deficiency and three short quizzes. Red or slow skeletal muscle fibers, have many mitochondria, are designed for enduration, and can contract for long periods of. Origins and paths of the eom the rectus eoms originate in the orbital apex from a common fibrous ring surrounding the optic nerve called the annulus of zinn.
With collaborations from al lens, sheila coyne nemeth, and janice k. Lee ann remington od, ms, faao, in clinical anatomy and physiology of the visual system third edition, 2012. Note that the rectus muscles pull the eye posteriorly while the oblique muscles pull the eye anteriorly. Click download or read online button to get ocular anatomy and physiology book now.
Parts ii and iii devoted to the nonparalytic phorias and tropias. Ocular anatomy and physiology download ebook pdf, epub. The output from the cortex causes activity in motor neurons in the brain stem that cause movement of the extraocular muscles through the third, fourth, and sixth cranial nerves. Anatomy, physiology and the pediatric eye exam nathalie azar, md director, pediatric ophthalmlology and adult strabismus. Superior rectus muscle an overview sciencedirect topics. Extraocular muscles basic and clinical anatomy see online here all the muscles controlling the movement of the eye are known as the extraocular muscles of the eye. Animations of extraocular cranial nerve and muscle function and damage university of. Wang embryology the extraocular muscles are of mesodermal origin, development beginning at 34 weeks gestation. Extraocular muscles second video in eye anatomy series.
This note covers the following topics about extraocular muscle anatomy. That portion which deals with the physiology of the muscles is clearly written and illustrated. Six of these are responsible for eye movement, and are also known as oculorotatory muscles. These muscles, named extraocular muscles rotate the eyeball in the orbits and allow the image to be focussed at all times on the fovea of central retina. Ocular anatomy and physiology introduction by the end of this chapter you will be expected to possess knowledge and understanding. The anatomy of extraocular muscles authorstream presentation. Thus, they are innervated by a branch of the trigeminal nerve cn v, the mandibular nerve. The origin of the inferior oblique muscle is here and represents the only extraocular muscle origin not at the orbital apex. Physiology of the muscular system key terms isometric contraction isotonic contraction motor unit myo. Anatomy and physiology of eye movements springerlink.