Orienting Sense

Orienting Sense - Orienting Sense The sense of equilibrium...

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1 Orienting Sense Fish in water … The sense of equilibrium and balance http://www.hummingbirds.net/gallery.html birds in air … … and mammals on ground all keep their equilibrium. 2 Vestibular Apparatus Three Semicircular Canals Sensory organ that senses gravity and acceleration. 3 Anatomy The three semicircular canals and the two sacs utricle and saccule are connected. Filled with endolymph they sense linear motion and postural tilts from neck, pelvis and ankles.
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4 Horizontal Acceleration Linear acceleration is sensed by saccule and utricle. 5 Postural Reflexes Postural tilts of the neck, pelvis or ankles are sensed by utricle. And saccule senses gravity. Neck Pelvis Ankles 6 Utricle Utricle (3 mm) is from the word “uterus”, meaning pouch and senses linear acceleration in the horizontal plane.
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7 Otolithic Membrane Otolithic membrane (macula) inside utricle is roughly elliptical in shape. Hair cell are oriented in many directions so linear acceleration in any direction may be sensed. Striola
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Orienting Sense - Orienting Sense The sense of equilibrium...

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