Popova I. S., Tsyhykalo O. V., Petryshen O. I., Khodorovska A. A.

MORPHOLOGY

Scentific article

The anterior and lateral neck regions contain a list of organs and structures that are involved in vital functions of the body (breathing, swallowing, voice formation, head and neck movements). The group of infrahyoid muscles of the neck are found below the lower edge of hyoid bone body, within the triangles of the anterior and lateral cervical regions. The omohyoid muscle is often used as a flap for reconstructive surgeries, and its location makes it a landmark for accessing the internal jugular vein and deep lymphatic nodes. The aim of our work was to investigate topographic and anatomical features of composition and course of the omohyoid in human fetuses during the prenatal period of ontogenesis. We have investigated 14 specimens of human fetuses (160,0-450,0 mm of parietal-heel length, 4-9th months of prenatal development) on the basis of the Chernivtsi Regional Pathological Bureau (based on the agreement on bilateral cooperation) using a set of classical morphological methods of examination. Photo-documentation of consecutive dissections of anterior and lateral regions of neck was carried out. The results of the study have revealed an atypical unilateral attachment of the inferior belly of omohyoid in 430,0 mm parietal-heel length fetus: it arised from the upper lateral surface of the clavicle. Examination of 6-month fetus revealed the absence of an intermediate tendon (270,0 mm parietal-heel length), which in turn affected the change in the angle between the superior and inferior bellies; this part of the muscle was found under the sternocleidomastoid. In all studied cases, superior belly was attached to the anterior edge of the body of hyoid bone, along with sternothyroid (lateral or actually above attachment point of last). Variant anatomy of omohyoid can be used in practical surgery during excision a muscle flap for reconstruction tasks, or when improving access to deep lymph nodes (in case of carcinoma metastasis) or to the internal jugular vein.

human development, neck muscles, omohyoid, anatomical variations.

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«Bulletin of problems biology and medicine» Issue 2 Part 2 (165), 2022 year, 147-150 pages, index UDK 611.93.013-053.13/.31

10.29254/2077-4214-2022-2-2-165-147-150