Module 7 Muscles - Back Flashcards
Serratus Posterior Superior - Innervation
T1-T4
Serratus Posterior Superior - Origin
Spinous processes of C7-T3
Serratus Posterior Superior - Insertion
posterior surfaces of ribs 2-5
Serratus Posterior Superior - actions
elevate the ribs during inhalation
Serratus Posterior Inferior - Innervation
T9-T12
Serratus Posterior Inferior - Origin
Spinous Processes of T12-L3
Serratus Posterior Inferior - Insertion
posterior surface of ribs 9-12
Serratus Posterior Inferior - actions
depress the ribs during exhalation
External intercostals - innervation
thoracic nerve
external intercostals - origin
inferior border of the rib above
external intercostals - insertion
superior border of the rib below
external intercostals - actions
draw the ribs superiorly (increases the space of the thoracic cavity) to assist with inhalation
internal intercostals - origin
inferior border of the rib above
internal intercostals - innervation
thoracic nerve
internal intercostals - insertion
superior border of the rib below
internal intercostals - actions
draw the ribs inferiorly (decreasing the space of the thoracic cavity) to assist with exhalation