Further back on the head, the geniohyoid muscle (originating on the lateral and medial surfaces of the lower jaw, as well as from part of the hyoid apparatus) is enormous: combined with the brachiomandibular and coracohyoid muscles, it allows rapid, simultaneous downward and backward rotation of the hyoid skeleton and associated expansion of the throat. From Wordnik.com. [ScienceBlogs Channel : Life Science] Reference
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