Muscles of the Back (Intermediate Group)

Question 1

Serratus Posterior Superior

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 1

A) Origin: Spinous Process of C7-T3
B) Insertion: Ribs 2-5
C) Innervation: Anterior Rami of Upper Thoracic Nerves (T2-T5)
D) Elevation of ribs 2-5

Question 2

Serratus Posterior Inferior

A) Origin
B) Insertion
C) Innervation
D) Action

Answer 2

A) Origin: Spinous Process: T11-L3
B) Insertion: Ribs 8-12
C) Innervation: Anterior Rami of Lower Upper Thoracic Nerves (T9-T12
D) Depression of ribs 8-12