corrugators and procerous muscles are important in accomodationof eye sight. It is worth while, therefore, to recall them, not only for completeness, but because of their undoubted clinical importance in connection with certain forms of ocular headaches. The first of these accessory muscles is the corrugator supercilii. According to Gray, this is a small pyramidal muscle placed near the median line, beneath the occipito frontalis and the orbicularis palpebrarum.
It arises from the inner extremity of the superciliary ridge, its fibers passing outward, to be inserted into the under surface of the orbicularis palpebrarum opposite the middle of the orbital arch. There are decided variations, however, in this muscle, as in others of the group, and also in the distribution of the fascia near the center of the forehead. These variations are appreciated when we compare the drawings given by…
