THE HEAD, ANTERIOR. 25 



2. Horizontally around the head just above the eyebrows and ears. Be 

 very careful, in removing the skin, not to take with it the underlying muscles, 

 which are closely united to it by a thin layer of dense fatty tissue. 



Occipitofrontalis. Fig. 2. 



Origin. In two portions, the posterior from the mastoid 

 process of the temporal and the outer two-thirds of the 

 superior curved line of the occipital bones. The anterior 

 portion from the corrugator supercilii, pyramidalis nasi, and 

 orbicularis palpebrarum muscles with which it is continu- 

 ous. Also from the overlying integument. 



Insertion. Both bellies are attached to the epicranial 

 aponeurosis galea capitis which fills in the space left 

 between the muscular portions. The epicranial aponeuro- 

 sis also reaches over the side of the head, as a thin layer 

 covering the temporal fascia, and gives attachment to the 

 small superior and anterior auricular muscles. 



Nerve Supply. The facial or seventh ; the posterior 

 auricular branch supplying the occipital portion, and the 

 temporal branches the frontal portion of the muscle. 



Action. To raise the eyebrows, and produce transverse 

 wrinkling of the forehead. 



The Auricular Muscles. 



These are so insignificant as to scarcely repay the atten- 

 tion of the student, and their description is omitted here. 



The Supratrochlear and Supra-orbital Nerves. Fig. 3. 



These are both branches of the frontal branch of the 

 ophthalmic nerve. See page 49. 



The supratrochlear nerve leaves the orbit above the 

 pulley of the superior oblique muscle and passes to the 

 front of the forehead, supplying the skin over the inner third 

 of the supra-orbital arch. 



The supra-orbital nerve issues from the notch, or fora- 



