Lecture 19: Control of gaze Flashcards
What are the six pairs of extraocular muscles to eye movements?
lateral rectus, inferior rectus, superior rectus, medial rectus, superior oblique and inferior oblique
What do forces acting on the head displace?
the otolithic membrane of the utricular macula e.g. forward head tilt results in this membrane tilting forward
What is an ampulla?
a localized dilatation at one end of the semicircular duct
What is found at the base of the ampulla and what does this structure contain?
a patch of innervated hair cells in a structure termed a crista
the crista contains hair cells with stereocilia oriented in a consistent direction
What is the role of ampulla?
surrounds sensory receptors that are responsible for movement related sensory experiences like spatial awareness and pressure change
What controls the magnitude of signals sent through nerve fibers in the ampulla?
how much the fluid is moving and how much movement is occurring in the plane that the canal is set up
