OCCIPITO- FKONTALIS. 



279 



epicranial aponeurosis it descends as a thin areolar layer between the external 

 muscles of the ear and the skin of the temporal region. 



MUSCLES. Under the title of occipito-frontalis are comprised the occipital 

 and frontal muscles, united together by a thin aponeurosis which extends over and 

 covers the upper part of the cranium. 



The occipitalis muscle, thin and subcutaneous, is attached inferiorly by short 

 tendinous fibres to the external two-thirds, sometimes less, of the superior curved 



Fig. 266. SUPERFICIAL MUSCLES ox THE LEFT SIDE OF THE HEAD AND NECK. (Allen Thomson, 



after Bourgery.) ^. 



a, epicranial aponeurosis ; b, siiperior curved line of the occipital bone ; c, ramus of lower jaw ; d, 

 hyoid bone ; e, sternal end of clavicle ; 1, frontalis muscle ; 1', occipitalis ; 2, superior auricular 

 muscle ; 2', anterior auricular ; 3, posterior auricular ; 4, margin of orbicularis palpebrarum ; 5, pyra- 

 midalis nasi ; 6, compressor naris ; 7, levator labii superioris alseque nasi ; 8, orbicularis oris ; 8', its 

 attachment to the septum narium ; 9, levator labii superioris, and close by it, zygomaticus minor ; 

 between x and 8, zygomaticus major ; and between the zygomatici, in shadow, is seen a portion of the 

 levator anguli oris ; 10, depressor labii inferioris ; 11, depressor anguli oris ; 12, levator menti ; 13, on 

 the masseter, is immediately above the risorius, and a line from it points to the buccinator ; 14, 

 platysma myoides ; 15, on the upper part of the sterno-rnastoid, points by a line to the posterior belly 

 of the digastric muscle ; 15', the sternal head of the sterno-mastoid, a part of its clavicular head is seen 

 near e ; 16, trapezius ; 17, splenius capitis ; 18, levator scapulae ; 19, sterno-hyoid ; 20, omo-hyoid ; 

 21, pectoralis major, its sterno-costal part ; 21', its clavicular part ; 22, deltoid. 



