Integrated somatosensory, visual, and vestibular information within the central nervous system
Receptors in joints, muscles, ligaments, and skin to provide proprioceptive information regarding length, tension, pressure, pain, and joint position info to cortex & cerebellum
(plays primary role when body not moving, UNLESS standing on uneven terrain...then req. all 3 systems)
Receptors allow for perceptual acuity regarding verticality, motion of objects and self, environmental orientation, postural sway, and movements of the head/neck.
Provides the CNS with feedback regarding the position and movement of the head with relation to gravity via semicircular canals. (makes final decision if diff. info from other 2 systems)
-Elicited by small, slow velocity perturbation
-Distal to proximal
-Fwd sway: gastroc>hams>paraspinals
-Bkwd sway: ant.tib>quads>abs
-Elicited by larger, faster perturbatiion
-Proximal to distal
-Fwd sway: abs>quads
-Bkwd sway: paraspinals>hams
Used to lower the center of gravity during standing or ambulation in order to better control the center of gravity.
A sense of movement and rotation of oneself or the surrounding environment caused by inner ear disease.
Drug side-effects linked to falls
orthostatic HTN, sedation, < reaction time, < cognitive ability
(highest risk is 3+ meds)
6 tests of visual-vestibular system
smooth pursuits, saccadic eye mvmts, vest.occular reflex, head thrusts, rapid head shaking, hallpike
pt. focuses on object while actively moving head side to side or up and down
therapist does quick passive mvmnt of head to neutral, from starting position of 30 deg.
pt. in long sitting....therapist quickly lowers into supine and head in ext.&rotation 45deg. to one side
-time & amt. of sway
-eyes closed, arms folded on chest, ankles touching
-30 sec. normal
-abnormal if eyes open or unfold arms before 30 sec.
Romberg- inability to maintain with eyes open vs. eyes closed
cerebellar prob. vs. somatosensory prob.