The =trapezius= is thin, and is not clearly divided into cervical and
thoracic portions. Its line of origin extends from about the middle of
the neck to the ninth or tenth thoracic spine, the right and left
muscles meeting on a median fibrous raphé.
The =omo-transversarius= arises by a tendon on the lower part of the
spine of the scapula (often partially blended with the trapezius), and
is inserted into the wing of the atlas.
The =rhomboideus= consists of three parts. The =dorsal portion=
(Rhomboideus thoracalis) is small; it arises from the fourth to the
sixth or seventh thoracic spine, and is inserted into the inner surface
(chiefly) of the dorsal angle of the scapula. The =cervical portion=
(Rhomboideus cervicalis) arises from the ligamentum nuchæ as far forward
as the second or third cervical vertebra, and is inserted into the inner
surface of the cervical angle of the scapula. The =cephalic portion=
(Rhomboideus capitis) is a continuation of the preceding which is
inserted into the occipital crest.
[Illustration: