Lecture 15 - Deep Back Muscles

Question 1

What are the the superficial muscles of the back?

L15 S21

Answer 1

• trapezius
• latissimus dorsi
• levator scapulae
• rhomboideus major
• rhomboideus minor

Question 2

What are the intermediate muscles of the back?

L15 S21

Answer 2

• serratus posterior superior

- serratus posterior inferior

Question 3

What are the deep/intrinsic muscles of the back?

L15 S21

Answer 3

Superficial:

• splenius capitis
• splenius cervicis

Intermediate:

• iliocosatlis
• longissimus
• spinalis

Deep:

• semispinalis
• multifidus
• rotatores

Question 4

What are the three divisions of the throacolumbar fascia?

L15 S28

Answer 4

Posterior lamina:
-attaches to spinous process

Middle lamina:
-attaches to lumbar transverse process

Anterior lamina:
-attaches to lumbar transverse process

Question 5

What are the different systems formed from the intrinsic muscles of the back? What do these groups do?

Answer 5

Spinotransversalis (superficial intrinsic):
-run laterally and upward to attach to transversprocesses and skull

Sacrospinalis (intermediate intrinsic):
-run longitudinally upward and attach to transverse processes, ribs, and spinous processes

Transverospinalis (deep intrinsic)
-run laterally and insert medially