300 INDIVIDUAL MUSCLES. 



CHAPTER VIII. 



OF THE INDIVIDUAL MUSCLES. 



Muscles of the Teguments of the Cranium. 



The skin that covers the cranium is moved by a single broad 

 digastric muscle, and one small pair. 



1 . Occipito-Frontalis, 



Arises fleshy from the transverse protuberant ridge near the 

 middle of the os occipitis laterally, where it joins with the tem- 

 poral bone ; and tendinous from the rest of that ridge back- 

 wards, opposite to the lateral sinus ; it rises after the same 

 manner on the other side. From thence it comes straight 

 forwards, by a broad thin tendon, which covers the upper part 

 of the cranium at each side, as low down as the attollens auris, 

 to which it is connected, as also to the zygoma, and covers a part 

 of the aponeurosis of the temporal muscle ; at the upper part of 

 the forehead it becomes fleshy, and descends with straight fibres. 



Inserted into the orbicularis palpebrarum of each side, and 

 into the skin of the eyebrows, sending down a fleshy slip be- 

 tween them, as far as the compressor naris and levator labii 

 superioris alaeque nasi. 



Use. Pulls the skin of the head backwards ; raises the eye- 

 brows upwards ; and, at the same time, it draws up and wrin- 

 kles the skin of the forehead. 



2. Corrugator Supercilii, 



Arises fleshy from the internal angular process of the os 

 frontis, above the joining of the os nasi and nasal process of 

 the superior maxillary bone ; from thence it runs outwards, and 

 a little upwards. 



Inserted into the inner and inferior fleshy part of the occipito- 

 frontalis muscle, where it joins with the orbicularis palpebrarum, 



