NM III Exam 2- Topic 1- Function & Structure of the Vestibular System Test Questions with Correct Answers Graded A+

NM III Exam 2- Topic 1- Function & Structure of the Vestibular System Test Questions with Correct Answers Graded A+ What allows you to focus on what you're looking at while your head is moving Vision is not blurred due to? -Gaze stabilization - AnswersVestibular ocular reflex (VOR) Output for the VOR what CN. - AnswersCN 6 Lateral rectus CN 4 sup oblique CN 3 rest What provides sensory input regarding position and motion of the head, controlling the position of the body's COM, stabilizing and orientating the head with respect to gravity -Postural control/ Balance - AnswersVestibulospinal reflex (VSR) What are the 3 components of the vestibular system? - Answers1. The peripheral sensory apparatus 2. Central processor 3. Mechanism for motor output The peripheral sensory apparatus is composed of - Answers3 semicircular canals 2 Otolith Which part of the sensory apparatus consists of 3 semicircular canals (SCC) & a central vestibule? It is filled with perilymphatic fluid. a. Bony Labyrinth b. Membranous Labyrinth c. Ampullae d. Cupula - Answersa. Bony Labyrinth Which part of the sensory apparatus is suspended within bony labyrinths by fluid & supportive connective tissue? It includes 3 SCC & 2 otoliths (utricle & saccule). An ampula is located at 1 end of each SCC. It is filled with endolymph: high K:Na ratio, like that of intracellular fluid. It does not communicate with perilymph. a. Hair cells b. Membranous Labyrinth c. Ampullae d. Cupula - Answersb. Membranous Labyrinth Which part of the sensory apparatus is suspended in each ampulla & otolith organ which converts motion into neural firing? a. Hair cells b. Membranous Labyrinth c. Ampula d. Cupula - Answersa. Hair cells sensory mechanisms of the SCC - AnswersCrista Which part of the sensory apparatus are dynamic receptors, responding to angular acceleration? a. Hair cells b. Membranous Labyrinth c. Semicircular canals d. Cupula - Answersc. Semicircular canals What type of movement is detected by SCC ? - AnswersRotational movement Most sensitive to FAST head mvt Canal oriented _____ to each other - Answers90 deg Horizontal canal is tilted up ____ the transverse plane - Answers30 deg Anterior / post canal oriented vertical - Answers45 deg Which part of the sensory apparatus is a Gelatinous membrane overlying each crista ampullaris? Hair cells are deflected by endolymphatic flow resulting from head motion. Hairs are embedded too Density is same as surrounding endolymphatic fluid. a. Ampullae b. Membranous Labyrinth c. Semicircular canals d. Cupula - Answersd. Cupula Which part of the sensory apparatus is a bulge at the base of a canal & contains the p