I think the swallowing action with elevation of larynx at upper level from resting positin is a good sing of these muscle action
It is mainly innervated by ansa cervicalis nerve and partialy by ansa hypoglossia
Sir, thanks for your input. Yes, all the quoted statements are true, But are there any clinical tests which can isolate the actions of strap muscles. Like for eg. flexion at elbow in semiprone position is brachioradialis.
Elevation of larynx during swallowing can be inspected or palpated. Surface EMG also may be useful.
Some thyroid surgeons are of the opinion that strap muscle cutting can cause post operative voice changes.
thank you for your inputs. I have to disagree with your statement of dividing strap muscles can cause post operative voice changes (even though certain anatomy texts claim it).
Yes, surface EMG can be used as a test to investigate into the intactness of the muscle.
But, the purpose of the question was to gather inputs relating to the clinical test (not investigation) isolating the actions of the strap muscles. It is also known that the actions of these muscles are overshadowed by the bulkier muscles in the region.
There are NO articles which suggests the significance of these muscle group ( let me know if you find any), except for being a muscle group of uncertain significance and providing a good surgical landmark on table.
Hi Karthik,
The post op voice change due to cutting of strap muscles is a controversial area in thyroid surgeries. Personally I have heard from senior thyroid surgeons that, cutting strap muscles affect post op voice especially in low pitch vocalization, although its a subtle change.
Many books says strap muscle injury as a non-neural cause for thyroid and parathyroid surgery related dysphonia (Surgery of thyroid and parathyroid glands, Textbook of endocrine surgery, Recurrent and SLN, Controversies in thyroid surgery and Atlas of endocrine surgical techniques etc.). But, there is one study available, which concluded strap muscle division is not associated with any voice change.
The landmark articles by Atkinson & Erikson reported strap muscles are important for lowering the fundamental frequencies especially from a mid to low range.
Offhand I don't remember any clinical test for strap muscles alone. Will let you know if I can find one.
https://www.ncbi.nlm.nih.gov/pubmed/18459003
http://www.haskins.yale.edu/sr/sr070/SR070_11.pdf
http://www.haskins.yale.edu/sr/SR049/SR049_06.pdf
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