PubMed Health⌕ Search

Biomedical subjects

A Bosatra

Publications and source records attributed to A Bosatra.

25 records · Page 2Linked to original sources
PubMedDate not supplied

Modifications of the stapedius muscle reflex under spontaneous and experimental brain-stem impairment.

An oscilloscopic plus a graphic method of recording of the stapedius muscle reflex has revealed peculiar modifications in the latency, threshold, and shape of development of the reflex in cases of brain-stem impairment. Many subjects have been examined who were affected by nucleo-reticular vestibular syndrome, vascular insufficiency, disseminated sclerosis, tumours, etc. and a comparison has also been made in normal subjects and in the same subjects during a temporary impairment of the brain-stem structures following barbiturate administration. The greatest semeiological value is attributed to the modifications in the shape of the reflex.

Adolescent↗
PubMedDate not supplied

Tympanic muscle reflex elicited by electric stimulation of the tongue in normal and pathological subjects.

A bilateral reflex contraction of the tensor tympani muscle has been obtained in man by electric stimulation of the tongue (1-2 mA). The stimulus is well tolerated and always effective. The advantage is stressed of eliciting a contraction of this muscle without involvement of the stapedius, as occurs with other methods. An analysis has been subsequently conducted in normal subjects and in patients affected by pathology of the tympano-ossicular system: tympanosclerosis, otosclerosis, suprastapedial facial paralysis; in cases of interruption of the afferent arch: section of the homo-lateral lingual nerve; in cases of involvement of its central portion: cerebello-pontine-angle tumours; and in cases of section of chorda tympani. A chiasm-like central nervous pattern is suggested.

Acoustic Stimulation↗
PubMedDate not supplied

Pathology of the nervous arc of the acoustic reflexes.

A short comment is made on the pathological conditions of the input and efferent arc of the stapedius reflex. The modifications of this reflex during pathological and experimental inpairment of the intermediate portion of the arc, at the brain stem level, in human subjects are analyzed in more detail. The graphic and oscilloscopic records demonstrate a modification of the latency, amplitude and particularly of the speed of onset of the reflex. A concomitant modification of the electronystagmogram and tonal tests of lateralization is also demonstrated. Some abnormal responses observed in cases of facial palsy (efferent arc) as compared with electrogustometry and the problem of eliciting an isolated reflex contraction of the tensor tympani are briefly commented upon.

Acoustic Stimulation↗
PubMedDate not supplied

Bipolar electric stimulation to elicit and isolated tensor tympani reflex.

A bipolar electrode is described, designed to obtain improved reflex responses from the tensor tympani muscle by electric stimulation of the under surface of the tongue, d.c. generator, 7-9 V d.c. In comparison with the previous unipolar method of stimulation the responses under oscilloscopic analysis appear very constant and of greater size. The latency, in normal subjects, is 117 msec.

Electric Stimulation↗