It can be hypothecated that, suprahyoid and infrahyoid muscles form a continuous band of muscles extending from base of the skull to sternum with intermittent attachment to hyoid bone.
Although numerous reports are cited in literature regarding variations in both the suprahyoid and infrahyoid muscles, we did not find similar case being reported in the literature.
Conditioning of the prosthesis with a solid titanium endoprosthetic tube under the infrahyoid muscles (day 0).
We placed the prosthesis between the infrahyoid muscles and the trachea and then inserted a solid titanium tube into the porous titanium prosthesis.
Conditioning of the porous titanium prosthesis with a solid titanium endoprosthetic tube under the infrahyoid muscles (day 0) for 60 days.
We positioned the prosthesis between the infrahyoid muscles and the trachea with a solid titanium endoprosthetic tube.
An exaggerated tension of the supra- and infrahyoid muscles
and a decrease in the suboccipital distance between C0-C1  would be added to this.
From the different types of variations in the infrahyoid muscles, the muscles extending between clavicle and hyoid bone were classified as cleidohyoid muscles by Loth as early as 1912 (7).
Omohyoid differs from the other three infrahyoid muscles (sternohyoid, sternothyroid, and thyrohyoid) in its course.
The infrahyoid muscles are formed from a muscle primordium occurring in the anterior cervical area (14).
Variations of the infrahyoid muscles, including the cleidohyoideus accessorius, are important to consider because of their relevance in diagnostic studies and as surgical landmarks.