Superficial group of back muscles:
Trapezius originates from the spinous processes of C7 to T12 to
the clavicle and the spine of scapula. It is innervated by the
motor-accessory nerve and assist in rotating the scapula during the
abduction of the humerus.
Latissimus dorsi originates from the spinous processes of the T7
to C5 to the intertubercle solus of the humerus. It is innervated
by the throacodorsal nerve and extends, adducts and medially
rotates the humerus.
Levator scapulae originates from the transverse processes of C1
to C4 to the medial border of the scapula. It is innervated by the
dorsal scapular nerve and elevates the scapula.
Rhomboid major originates from the spinous processes of T2 to T5
to the medial border of scapula. It is innervated by the dorsal
scapular nerve and elevates and adducts the scapula.
Rhomboid minor originates from the spinous processes of C7 to T1
to the medial border of the scapula. It is innervated by the dorsal
scapular nerve and elevates and adducts the scapula.
Intermediate muscles of the back:
Serratus posterior superior originates from the spinous
processes of C7 to T3 to the ribs of 2 to 5. It is innervated by
the anterior rami of the upper throacic nerves and elevates the
ribs 2 to 5.
Serratus posterior inferior originates from the spinous process
of T11 to L3 toribs 9 to 12. It is innervated by the anterior rami
of the lower throacic nerves. It depresses the ribs 9 to 12.
Spinotransversales muscles:
Splenius capitius originates from the spinous process of C7 to
T4 to the mastoid process. It is innervated by the posterior rami
of the medial cervical nerves. Draw and rotate head to one side.
Together extend neck.
Splenius cervicis originates from the spinous T3 to T6 to
transverse C1 to C3. It is innervated by the posterior rami of the
lower cervical nerve. It rotate head to one side. Together extend
neck