Abstract
The infrahyoid muscles are involved in vocalisation and swallowing; among these, the sternothyroid muscle is derived from the common primitive sheet. The improper differentiation of this muscle may therefore result in morphological variations. We report an unusual variation found during the dissection of a 65-year-old male cadaver at the Sri Manakula Vinayagar Medical College, Madagadipet, Pondicherry, India, in 2015. An anomalous belly of the right sternothyroid muscle was observed between the internal jugular (IJ) vein and the internal carotid artery with an additional insertion into the tympanic plate and petrous part of the temporal bone and the presence of a levator glandulae thyroideae muscle. The anomalous muscle may compress the IJ vein if it is related to the neurovascular structures of neck; hence, knowledge of variations of the infrahyoid muscles can aid in the evaluation of IJ vein compression among patients with idiopathic symptoms resulting from venous congestion.
Highlights
Case ReportA regular anatomy dissection session of a 65-yearold male cadaver was performed at the Sri Manakula Vinayagar Medical College, Madagadipet, Pondicherry, India, in 2015
The infrahyoid muscles are involved in vocalisation and swallowing; among these, the sternothyroid muscle is derived from the common primitive sheet
We report an unusual variation found during the dissection of a 65-year-old male cadaver at the Sri Manakula Vinayagar Medical College, Madagadipet, Pondicherry, India, in 2015
Summary
A regular anatomy dissection session of a 65-yearold male cadaver was performed at the Sri Manakula Vinayagar Medical College, Madagadipet, Pondicherry, India, in 2015 During this dissection, an anomalous right ST muscle was found. The muscle originated from the posterior surface of the manubrium sterni at the medial end of the costal cartilage of the first rib. The medial slip was inserted superiorly to the oblique line of the thyroid cartilage; the lateral slip ascended and some of its fibres were attached to the fascial sheath of the great vessels of the neck, known as the carotid sheath [Figure 1]. The sigmoid sulcus of the sinus was significantly larger and deeper on the right side of the posterior cranial fossa [Figure 3]
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