Artful Balance: Future US Defense Strategy and Force Posture in the Gulf
05c posture and balance
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Transcript of 05c posture and balance
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Vestibular System
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Overview of Vestibular System
1. Detects motion of head in space to control head and body posture and eye movement
2. Provide subjective sense of movement and orientation in space
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The Vestibular system
The Maculae are responsible for (linear acceleration forces) Detecting Orientation of the Head with Respect to GravityThe Maculae are in the
– Saccule : is responsible forvertical acceleration– Utricle: Is responsible forhorizontal acceleration
Saccule
Utricle
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Vestibular Hair Cells
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Macule and Hair Cell
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Vestibular transduction of Mechanical Stimuli
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Morphological polarization of hair cells in the utricular and saccular maculae
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Forces acting on the head and the resulting displacement of the otolithicmembrane of the utricular macula
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Response of a vestibular nerve axon from an otolith organ
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Vestibular Navigation
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The Semicircular Canals Detect Angular Accelerations
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The ampulla is responsible for the change in rotational movement
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Vestibular Inputs
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Posture and Balance
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Postural adjustments require anticipatory motor actions.
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Anticipatory maintenance of body posture
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Anticipatory motor action in response to postural disturbance
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Appropriate anticipatory responses to postural disturbances can be learned
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Adaptive Postural Control Is Learned During Locomotion
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The vestibular contribution to postural adjustment depends on whether the primary perturbation is to the feet or the head
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Upper Motor Neurons That Maintain Balance and Posture
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