PubMed Health⌕ Search

Biomedical subjects

W K Wright

Publications and source records attributed to W K Wright.

46 records · Page 3Linked to original sources
PubMedDate not supplied

Eye-head coordination and lateral canal block in squirrel monkeys.

Eye and head nystagmus during horizontal optokinetic stimulation was analyzed in squirrel monkeys. Slow phase speed of coupled head and eye nystagmus showed highly significant negative correlations in normal subjects; correlation coefficients were -0.81 at 60 degrees/sec and -0.72 at 100 degree/sec stimuli. Bilateral semicircular canal block resulted in a reduction of the negative correlation. The postoperative reduction of the correlation coefficient value ranged from 0.17-0.28 (significant at P less than 0.01 level) at 60 degrees/sec stimulus and 0.06-0.13 (non significant) of 100 degrees/sec stimulus. Gaze speed was calculated by summing slow phase speeds of coupled head and eye nystagmus. Mean error of gaze in normal subjects was 1.5% at 60 degrees/sec stimulus and 7.8% at 100 degrees/sec stimulus. Mean gaze speed showed an overshoot (8% at 60 degrees/sec stimulus and 6.5% at 100 degrees/sec stimulus) in the tree to four weeks postoperative period; however, this subsided two to three months after the operation. Measurement of head-turning performance (in yaw plane) in humans may provide a clinically useful index for the assessment of certain types of vestibular function.

Animals↗
PubMedDate not supplied

Basic science approach to otoplasty for prominent ears.

Variations of the conchal setback operation for prominent ears have produced my best long-term otoplasty results. Additional use of the Mustarde mattress sutures combined with cartilage weakening techniques must be used when the anthelix cartilage is thick and flat or concaved, but they should never be used above the beginning of the inferior crus. Other additional techniques which can be used to supplement or replace the Mustarde sutures are radical postauricular skin excision and closure under tension, incision and suturing to sharpen the inferior crus, and mattress sutures from the periosteum to the fossa triangularsor anterior helix. Methods for correction of lobular protrusion are also discussed.

Ear, External↗
PubMedDate not supplied

Optokinetic nystagmus after cerebellar uvulonodulectomy in squirrel monkeys.

After cerebellar uvulondulectomy in squirrel monkeys (Saimiri sciureus), a change occurred in the optokinetic nystagmus, in that there was a slow-phase eye speed decline, at the stimulus speeds above 90 degrees/sec. The difference was statistically significant when pre- and post-ablative comparisons were made. This result supports the usefulness of the optokinetic nystagmus examination to diagnose conditions which involve posterior inferior vermis of vestibulo-cerebellum. The optokinetic after-nystagmus depicted a similar decline postoperatively.

Animals↗
PubMedDate not supplied

Utricular and saccular volumetry in human temporal bones.

Using serially sectioned human temporal bones, endolymphatic volumes of utriculus and sacculus were measured with the aid of a computer. The mean of the utricular volume was 8.187 mm3, and the saccular volume, 2.096 mm3. The former was 3.9 X the latter. The surface area of the macula utriculi was 3.271 mm2, and the macula sacculi was 2.188 mm2. The former was 1.5 X the latter. The study using pathologic temporal bones (Meniere's disease, otosclerosis, and otitis media chronica) showed that the utricular volume could indeed increase, and the saccular membrane was found to be more fragile than the utricular membrane in those diseased conditions.

Child, Preschool↗