We don't have synonyms for occipitalis yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are occipitals, occipital and occipitally.
(n) :
(anatomy) A muscle of the head that arises from the lateral two-thirds of the superior nuchal lines and from the mastoid part of the temporal bone, inserts into the galea aponeurotica, and acts to move the scalp; it is sometimes considered to be part of the occipitofrontalis muscle.
(n) :
(anatomy) A muscle of the head that arises from the lateral two-thirds of the superior nuchal lines and from the mastoid part of the temporal bone, inserts into the galea aponeurotica, and acts to move the scalp; it is sometimes considered to be part of the occipitofrontalis muscle.