Review Test 4: Muscles of the Torso, Neck, Shoulder, and Scapula

What are the 4 conspicuously anterior muscles that can flex the torso?

transversalis, internal oblique, external oblique, rectus abdominus

Which pair of deep muscles can cause flexion at the torso as well?

psoas

Which 2 pairs of torso flexors also cause rotation at the torso?

internal and external obliques

Name the 3 sets of spine extensors:

erector spinae, semispinalis, deep posterior muscles

What muscle runs from the iliac crest to the lowest rib and transverse processes of the upper lumbar vertebrae? What is its primary action at the spine?

quadratus lumborum, lateral flexion + stabilization

What singular joint actions at the orso will most of the muscles located in each of these locations produce? (anterior, posterior, lateral)

Anterior- flexion

Posterior- extension/hyperextension

Lateral- lateral flexion