120 THE MUSCLES. 
its lateral end it touches the occipitoscapularis (Fig. 73, a), 
serratus anterior (2), levator scapule (/), supraspinatus (Fig. 
75, @), and infraspinatus (Fig. 75, c), and the teres major (Fig. 
75, @). 
Action.—Draws the scapula toward the vertebral column. — 
M. cleidomastoideus (clavicular portion of the human sterno- 
cleidomastoid) (Fig. 65, %).—A narrow flat muscle between 
the mastoid process and the clavicle. 
Origin from the apex and caudal margin of the mastoid 
process of the temporal bone, by tendon and muscle fibres. 
The muscle passes caudad, becoming broader and thinner. 
insertion into the lateral four-fifths of the clavicle within 
the insertion of the clavotrapezius, and into the raphe which 
continues laterad of the clavicle. 
Relations.—Outer or lateral surface at the caudal end with 
the clavotrapezius (Fig. 65, 7); further craniad with the 
depressor conche (Fig. 64, 4), the platysma, and the sterno- 
mastoid (Fig. 65, ¢). Inner or medial surface with the supra- 
spinatus (Fig. 75, @) caudad, with the mass of fat in the axilla 
at its middle, with the levator clavicule ventralis (Fig. 65, 2) 
and obliquus capitis superior (Fig. 71, ¢) craniad. 
Action. —Pulls the clavicle craniad when the head is fixed. 
Turns the head and depresses the snout when the clavicle is 
fixed. 
M. levator scapula ventralis, or levator clavicule (Fig. 
68, /; Fig. 65, 2; Fig. 72, ¢, c’, c’”) (not usually found in man). 
Origin (Fig. 72, ¢’, c’’) in two parts. (1) By fleshy fibres 
from the ventral surface of the atlantal transverse process near 
its caudal border (c’). (2) By a small tendon from the ventral 
surface of the basioccipital opposite the middle of the length of 
the bulla tympani (c”) in common with the longus capitis (a). 
The two heads unite to form a flat band which passes caudo- 
ventrad and is inserted (Fig. 76, 7) by a flat short tendon, 
about eight millimeters broad, into the outer surface of the 
metacromion along its ventral border, and into the infraspinatus 
fossa for one or two millimeters distad of that border. 
Relations. —Near the insertion the dorsal border overlaps 
the border of the acromiotrapezius (Fig. .68, 2), and the ventral 
