The Muscles 97 
sterno-mastoideus, anterior part of atlanti-mas- 
toideus); (b) a posterior part or sterno-atlanticus 
(Plate I., Figs. 1 and 2, cst?) (sterno-mastoideus, 
inner belly of the ‘‘head-nodder,’’ posterior part 
of the sterno-atlanticus). The former part is a 
rather short but not weak muscle that arises from 
the squamosum and inserts itself on the rib of the 
atlas (alligator) or of the atlas and epistropheus 
(crocodile). 
The latter part is fairly strong and exceeds the 
anterior part in length; it springs from the rib of 
the first cervical vertebra, opposite the insertion 
of the anterior part, and inserts itself on the ante- 
rior border of the outer surface near the episternum. 
At times superficial fibers pass into the pectoral 
fascia. 
Dorso-scapularis (Cucullaris) (Plate I., Figs. 1 
and 2, Cu) (Trapezius). A broad but thin muscle 
that begins as an aponeurosis from the dorsal 
fascia in the middle line of the hinder part of the 
neck and beginning of the back; with converging 
fibers it passes within to insert itself partly on the 
spine of the scapula and partly by superficial 
fibers in the fascia that cover the deltoides scap- 
ularis inferior muscle. 
Collo-scapularis Superficialis (Plate I., Fig. 1, 
cssp) (Levator scapule superficialis, Levator scap- 
ule, Heber des Schulterblatts, Acromio-trachélien, 
Teil des Serratus magnus, Levator anguli scap- 
ule). A considerable muscle on the side of the 
7 
