THE MUSCLES. 65 



coronoid process of the lower jaw. Inserted into the angle of the 

 mouth, and is perforated by the duct of the parotid gland. Use 

 To contract the mouth, and draw the angle of it outwards and 

 backwards. 



Depressor anguli oris arises from the lower edge of the under 

 jaw, near the chin. Inserted into the angle of the mouth. Use 

 To draw the corner of the mouth downwards. 



Depressor labii inferioris arises from the inferior part of the 

 lower jaw, next the chin. Inserted into the middle of the under 

 lip. Use To draw the under lip downwards and outwards. 



Orbicularis oris ; this muscle surrounds the lips, and is in a great 

 measure formed by the buccinator, zygomatici, and others, which 

 move the lip. Use To shut the mouth by contracting the lips. 



Depressor libii superior is alcequa nisi arises from the sockets of 

 the upper incisor teeth. Inserted into the root of the ala nasi and 

 upper lip. Use To pull the ala nasi and upper lip down. 



Constrictor nasi, arises from the root of one wing of the nose, 

 and goes across the other. Use To compress the wings of the 

 nose. 



Levator menti vel labii inferioris arises from the lower jaw, at 

 the root of the incisors. Inserted into the skin in the centre of the 

 chin. Use To raise the under lip and skin of the chin. 



MUSCLES OF THE EXTERNAL EAR. 



Superior auris arises from the tendon of the occipito-frontalis, 

 above the ear. Inserted into the root of the cartilaginous tube of 

 the ear. Use To draw the ear upwards, and make it tense. 



Anterior auris arises near the back part of the zygoma. In- 

 serted into the eminence behind the helix. Use To raise the 

 eminence forwards. 



Posterior auris arises from the mastoid process by two, and 

 sometimes three, sasciculi. Inserted into the septum that divides 

 the scapha and concha. Use To draw the ear back, and stretch 

 the concha. 



Helicis major arises from the upper, anterior, and acute part of 

 the helix. Inserted into th* cartilages of the helix, a little above 

 the tragus. Use To depress the upper part of the helix. 



Helicis minor arises from the inferior and anterior part of the 

 helix. Inserted into the cms of the helix. Use To contract the 

 fissure. 



Tragicus arises from the outer and middle part of the concha, 



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