Intermediate Back Muscles Flashcards
1
Q
What are the muscles of the intermediate back?
A
1) Serratus posterior superior
2) Serratus posterior inferior
2
Q
Serratus posterior superior?
A
The serratus posterior superior is a thin, rectangular shaped muscle. It lies deep to the rhomboid muscles on the upper back.
Origin - lower part of the nuchal ligament, spines of C7-T3.
Insertion - pass in an inferolateral direction, attaching to ribs 2-5.
Innervation - intercostal nerves
Actions - elevates ribs 2-5.
3
Q
Serratus posterior inferior?
A
The serratus posterior inferior is broad and strong. It lies underneath the lastissimus dorsi.
Origin - spines of T11 - L3.
Insertion - fibres pass in a superolateral direction, attaching to ribs 9-12.
Innervation - intercostal nerves
Action - depresses ribs 9-12.
