A unique muscle bridge between sternohyoid and sternothyroid muscles

Year 2017, Volume: 11 Issue: 3, 157 - 158, 15.12.2017

Murat Çetkin , Mustafa Orhan İlhan Bahşi Piraye Kervancıoğlu

https://izlik.org/JA98UW65XB

Abstract

During cadaveric dissection, a unique muscle bridge on the left anterior cervical region of male cadaver was detected and

morphometric measurements were performed. The unique muscle bridge was between the sternohyoid and sternothyroid

muscles. Ipsilateral sternohyoid muscle started from the lower back surface of the sternal extremity of the clavicula and from

costoclavicular ligament, but it had no fibers starting from the sternum. Three nerve branches were observed separating from

ansa cervicalis on the lateral of that muscle bridge; the top and the lowest nerve branches went to the sternothyroid muscle,

the median branch innerved the muscle bridge. As a result of the thorough literature review made, no case similar to

the variation detected in this study was encountered. During the surgical interventions such as tracheostomy, thyroidectomy

and trachea resections, knowing the presence of this muscle bridge can reduce the iatrogenic injuries to this structure.

Keywords

infrahyoid; muscle bridge; muscle variation; sternohyoid; sternothyroid

References

• 1. Moore KL, Dalley AF, Agur AM. Clinically oriented anatomy. 7th ed. Baltimore (PA): Lippincott Williams and Wilkins; 2014. p. 1001–2.
• 2. Bergman R, Afifi A, Miyauchi R. Illustrated encyclopedia of human anatomic variation. Opus I: muscular system: omohyoideus, sternohyoideus, thyrohyoideus, sternothyroideus [Internet] 1996. [Revised on March 29, 2017]. Available from: http://www.anatomyatlases. org/AnatomicVariants/AnatomyHP.shtml
• 3. Standring S, editor. Gray's anatomy: the anatomical basis of clinical practice. 41st ed. London (UK): Elsevier Churchill and Livingstone; 2016. p. 449–450.
• 4. Kang DW, Byeon Y, Yoon SP. An accessory belly of the sternothyroid muscle on the anterior neck. Surg Radiol Anat 2015;37:215–7.
• 5. Nayak S, Rai R, Krishnamurthy A, Prabhu LV, Potu B. An anomalous belly of sternothyroid muscle and its significance. Rom J Morphol Embryol 2009;50:307–8.
• 6. Sato I, Ueno R, Sato T. A consideration of the normal and abnormal human suprahyoid and infrahyoid musculature. Okajimas Folia Anat Jpn 1987, 64:17–37.
• 7. Rai R, Ranade A, Nayak S, Vadgaonkar R, Mangala P, Krishnamurthy A. A study of anatomical variability of the omohyoid muscle and its clinical relevance. Clinics 2008,63:521–4.
• 8. Raikos A, Agnihotri A, Yousif S, Kordali P, Saberi M, Brand-Saberi B. Interal jugular vein cannulation complications and elimination of the muscular triangle of the neck due to aberrant infrahyoid muscles. Rom J Morphol Embryol 2014;55:997–1000.
• 9. Tripathy PR, Preetam C. Unilateral absence of the sternohyoid muscle with contralateral tendinous belly of superior belly of omohyoid muscle: a very rare form of infrahyoid muscle variation. International Journal of Anatomy and Research 2015,3:1302–5.