Musculus serratus posterior inferior

The video tutorial discusses the serratus posterior muscles, focusing on their origin, attachment, and function. It explains how these muscles are involved in respiration and spine movement, highlighting their role in lowering ribs and aiding expiration. The tutorial also covers the embryogenesis and innervation of these muscles, emphasizing their importance in stabilizing and mobilizing the spine.

What role do the anterior rami of the spinal nerves play in relation to the serratus posterior muscles?

Explain how the bilateral and unilateral contractions of the serratus posterior muscles affect the spine.