56 ANATOMY AND PHYSIOLOGY FOR NURSES 



The occipitofrontalis is a broad, musculofibrous layer 

 that covers the vertex, and blends in front with the 

 muscles of the face and laterally with the fascia of the 

 temporal muscles. Action, raises the eyebrows and the 

 skin of the nose and causes the transverse wrinkles of the 

 brow; the whole scalp may be moved forward and back- 



FlG. 31. Muscles of the right side of the head and neck: i, Frontalis; 

 2, temporal; 3, retrahens aurem ; 4, orbicularis palpebrarum ; 5, pyramid- 

 alis nasi ; 6, compressor naris ; 7, levator labii superioris alseque nasi ; 8, 

 levator labii superioris; 9, zygomaticus major; 10, orbicularis oris ; n, de- 

 pressor labii inferioris ; 12, depressor anguli oris ; 13, anterior belly of 

 digastric; 14, mylohyoid ; 15, hyoglossus ; 16, stylohyoid ; 17, posterior belly 

 of digastric; 18, the masseter ; 19, sternohyoid ; 20, anterior belly of omo- 

 hyoid ; 21, thyrohyoid ; 22, 23, lower and middle constrictors of pharynx; 

 24, sternomastoid ; 25, 26, splenius ; 27, levator scapulae; '28, anterior scale- 

 nus; 29, posterior belly of omohyoid ; 30, middle and posterior scalenus; 

 31, trapezius. 



ward by the action of this muscle. It is involved in ex- 

 pressing surprise and horror. 



Blood-supply, from the occipital and posterior auricular 

 behind, and by the supra-orbital and anterior temporal 

 in front. 



Nerve-supply, posteriorly by the posterior auricular 

 branch of the facial, and exceptionally from the occipital 



