Related Experiment Videos
Respiratory activities in relation to external glossal muscles
1First Department of Oral and Maxillofacial Surgery, Osaka University, Japan.
The Journal of Osaka University Dental School
|December 1, 1993
Summary
The genioglossus (Gg) and styloglossus (Sg) muscles show no respiratory activity during quiet breathing in dogs. However, both muscles exhibit inspiratory activity under hypercapnic conditions, with Sg being more sensitive.
Area of Science:
- Physiology
- Respiratory Physiology
- Neuroscience
Background:
- The genioglossus (Gg) and styloglossus (Sg) are external glossal muscles.
- Their role in respiration is not fully understood.
Purpose of the Study:
- To investigate the respiratory-related activities of the Gg and Sg muscles in dogs.
- To determine the sensitivity of these muscles to respiratory stimuli.
Main Methods:
- Electromyography (EMG) was used to record muscle activity in dogs.
- Hypercapnia was induced using a closed rebreathing system.
- Carotid body stimulation was performed using NaCN injection.
Main Results:
- No phasic respiratory activity was observed in Gg or Sg during quiet breathing.
- Both Gg and Sg demonstrated inspiratory EMG activity under hypercapnic conditions (PaCO2 > 50 mmHg for Sg, > 55 mmHg for Gg).
- NaCN injection enhanced inspiratory EMG activity in both muscles, with Sg showing greater sensitivity.
Conclusions:
- The Gg and Sg muscles are recruited during hypercapnia.
- The styloglossus (Sg) muscle is more sensitive to respiratory stimulation than the genioglossus (Gg) muscle.