30 A MANUAL OF ANATOMY. 



Corrug-ator Supercilii. 



Origin. From the inner surface of the superciliary ridge 

 of the frontal bone. 



Insertion. Into the inner surface of the frontal portion of 

 the occipitofrontalis and the skin above the middle of the 

 eyebrow. 



Nerve Supply. The seventh, through its temporal 

 branch. 



Action. To wrinkle the skin of the forehead vertically 

 (frowning). 



The Temporal Fascia. Fig. 3. 



This is a dense shiny layer of fascia lying under the apo- 

 neurosis of the occipitofrontalis, and covering in the tem- 

 poral muscle. 



It is attached to the outermost ridge of the temporal 

 fossa, from the external angular process of the frontal to 

 the posterior root of the zygomatic arch behind, and below 

 to the zygomatic arch in two layers, one to the inner and 

 one to the outer border of its upper margin. 



Between these layers is found a little fat, the orbital 

 branch of the temporal artery, and the temporal branch of 

 the temporomalar nerve (of the superior maxillary). 



Temporal. Fig. 4. 



Origin. From the whole of the temporal fossa of the 

 skull and the inner surface of the temporal fascia. 



Insertion. Into the tip, anterior border, and inner sur- 

 face of the coronoid process of the lower jaw. 



Nerve Supply. The fifth cranial nerve through the motor 

 portion of its inferior maxillary branch. 



Action. To close the lower jaw, and, by the posterior 

 portion, to retract it. 



