Back/Abs Action

Question 1

Splenius capitis

Answer 1

unilateral ipsilateral rotation and sidebend, bilateral head and neck extension

Question 2

splenius cervicis

Answer 2

unilateral ipsilateral rotation and sidebend, bilateral head and neck extension

Question 3

iliocostalis

Answer 3

unilateral ipsilateral sidebend of vertebral column, bilateral back extension and eccentric control of back flexion

Question 4

longissimus

Answer 4

unilateral ipsilateral sidebend of vertebral column, bilateral back extension and eccentric control of back flexion

Question 5

spinalis

Answer 5

unilateral ipsilateral sidebend of vertebral column, bilateral back extension and eccentric control of back flexion

Question 6

semispinalis

Answer 6

extension of head, neck, and cervical & thoracic vertebrae, contralateral rotation

Question 7

multifidus

Answer 7

stabilizes vertebrae

Question 8

rotatores

Answer 8

stabilize vertebrae and assist with local rotation and extension

Question 9

interspinales

Answer 9

aid in extension and rotation of vertebral column

Question 10

intertransversarii

Answer 10

sidebend and stabilization

Question 11

levatores costarum

Answer 11

elevates ribs for inspiration, aids in lateral flexion

Question 12

trapexius

Answer 12

(descending) elevates, (transverse) retracts, and (ascending) depress/rotates scapula

Question 13

latissimus dorsi

Answer 13

extends, adducts, and internally rotates shoulder in open chain; elevates trunk on shoulder in closed chain

Question 14

levator scapulae

Answer 14

elevates scapula and inferiorly rotates glenoid capsule with scapular rotation

Question 15

rhomboid major

Answer 15

retracts scapula and depresses glenoid cavity

Question 16

rhomboid minor

Answer 16

retracts scapula and depresses glenoid cavity

Question 17

serratus posterior superior

Answer 17

elevates ribs 2-5

Question 18

serratus posterior inferior

Answer 18

depresses ribs 9-12

Question 19

pectoralis major

Answer 19

adducts and medially rotates arm
clavicular head flexes arm
sternocostal head extends flexed arm

Question 20

pectoralis minor

Answer 20

stabilizes scap, pulling anterioinferiorly

Question 21

subclavius

Answer 21

anchors and depresses clavicle

Question 22

serratus anterior

Answer 22

protracts scapula and holds it to the thoracic wall (winged scap)

Question 23

external abdominal oblique

Answer 23

ipsilateral sidebending and rotation, increase intra-abdominal pressure, forms inguinal ligament

Question 24

internal abdominal oblique

Answer 24

ipsilateral sidebending and contralateral rotation, increase intra-abdominal pressure

Question 25

transversus abdominis

Answer 25

sidebending, rotation, and increase intra-abdominal pressure

Question 26

rectus abdominis

Answer 26

flexes the trunk