EXPLANATION OF PLATE II. 



A view of the muscles situated on the front surface of the body, 

 seen in their natural position. It must be understood that beneath 

 these muscles many others are situated, which cannot be represented 

 in the figure. 



Muscles of the Face, Head, and Neck: 



1. Muscle of the Forehead. This, together with a muscle at the back of the 



head, has the power of moving the scalp. 



2. Muscle that closes the Eyelids. The muscle that raises the upper eyelid 



so as to open the eye, is situated within the orbit, and consequently 

 cannot be seen in this figure. 



3. 4, 5. Muscles that raise the Upper Lip and angle of the Mouth. 



6, 7. Muscles that depress the Lower Lip and angle of the Mouth. By the 

 action of the muscles which raise the upper lip, and those that depress 

 the lower lip, the lips are separated. 



8. Muscle that draws the Lips together, so as to close the Mouth. 



9. Muscle of the Temple (Temporal Muscle). 



10. Masseter Muscle. 9 and 10 are the two chief muscles of mastication, for 



when they contract, the movable lower jaw is elevated, so as to crush 

 the food between the teeth in the upper and lower jaws. 



11. Muscle that compresses the Nostril. Close to its outer side is a small 



muscle that dilates the nostril. 



12. Muscle that wrinkles the Skin of the Neck, and assists in depressing the 



lower jaw. 



13. Muscle that assists in steadying the Head, and also in moving it from side 



to side. 



14. Muscles that depress the Windpipe and Organ of Voice. The muscles 



that elevate the same parts are placed beneath the lower jaw, and can- 

 not be seen in the figure. 



Muscles that connect the upper extremity to the trunk. Portions 

 of four of these muscles are represented in the figure, viz. : 



15. Muscle that elevates the Shoulder. Trapezius Muscle. 



17. Great Muscle of the Chest, which draws the Arm in front of the Chest 



(Great Pectoral Muscle). 



18. Broad Muscle of the Back, which draws the Arm downwards across the 



back of the Body (Latissimus Dorsi). 



19. Serrated Muscle extends between the Ribs and Shoulder-blade, and draws 



the shoulder forwards and rotates it, a movement which takes place in 

 the elevation of the arm above the head (Serratus magnus). 



