380 
connecting it with its 
fellow of the opposite 
side (called ‘ ligamen- 
tum nuche’ by Meckel), 
and is inserted into the 
Spine (‘ margo anterior 
scapule,’ Meckel) and 
acromion process of the 
scapula, and into the 
outer half of the cla- 
vicle. 
The latissimus dorsi, 
a very long and broad 
muscle, arises from the 
spines of all the dorsal 
and lumbar vertebra, 
and from the eleven 
posterior ribs; it is in- 
serted by a broad and 
strong tendon into the 
distal half of the ulnar 
margin of the humerus. 
At its anterior part this 
muscle may be sepa- 
rated into a superficial 
and deep stratum. 
The rhomboideus is a 
single muscle, but thick 
and long, extending 
from the occiput to the 
narrow base of the sca- 
pula. 
The splenius is united 
by an intermediate ten- | 
don with the opposite | 
muscle, and is inserted 
into the mastoid pro- 
cess. 
The biventer cervicis 
and the complerus are 
distinct throughout their 
whole course, which ex- 
tends from the anterior 
dorsal and posterior cer- 
vical spines to the occi- 
put; the complexus is 
the longest and thickest 
muscle, and divides into 
an external, shorter, and 
deeper-seated portion, 
and an internal, longer, 
and superficial portion. 
The sacrolumbalis ari- 
ses from the dorsal ex- 
tremity of the ilium, is 
attached to the ribs, over 
which it passes in its 
course to its insertion 
into the transverse pro- 
cesses of the four or five 
pecgel cervical verte- 
The longissimus dorsi 
is a much thicker and 
narrower muscle, and 
extends from the dorsal 
aspect of the sacrum 
along the spine to the 
third or fourth cervical 
vertebra. 
MONOTREMATA. 
Fig. 180. 
} oF fo fp ‘Us 
| \ Lh AS | 
i ei 
Muscular system, ventral aspect. Ornithorhynchus paradoxus. ( Meckel. ) 
