The Trunk And Its Muscles

Question 1

What does the abdomen fascia do?

Answer 1

Muscles of the abdominal wall do not go directly from bone to bone but attach into an aponeurosis (fascia) around the abdomen (termed the linea Alba)

Question 2

What movements are available at the pelvis?

Answer 2

Anterior pelvic rotation
Posterior pelvic rotation 
Right/left lateral flexion 
Right transverse rotation (clockwise)
Left transverse rotation (anti-clockwise)

Question 3

Function and description of transverse abdominis?

Answer 3

Fibers run horizontally and the main action is stability

Question 4

Function and description of internal obliques?

Answer 4

Fibers run upwards and medically, aids trunk flexion, lateral trunk flexion and trunk rotation

Also posterior pelvic tilt and lateral pelvic tilt (external obliques are same)

Question 5

Actions of rectus abdominis?

Answer 5

Trunk flexion,
Posterior pelvic rotation
Lateral flexion

Question 6

What are the 3 columns of the erector spinae?

Answer 6

Spinalis (most medial)
Iliocostalisis (most lateral)
Longissimus (intermediate)

Question 7

Actions and description of the erector spinae?

Answer 7

Fibers run vertically and performs actions such as extension of all regions of vertebral column and side flexion

Question 8

Multifidus actions and description?

Answer 8

Acts as a segment stabiliser and helps with postural adjustment

Superficial fibers can contribute to extension side flexion and rotation

Question 9

Quadratus lumborum actions?

Answer 9

Acts as a lateral flexor to the same side, involved in maintenance of pelvis when standing one legged

Question 10

Actions of rectus abdominis?

Answer 10

Trunk flexion,
Posterior pelvic rotation
Lateral flexion

Question 11

What are the 3 columns of the erector spinae?

Answer 11

Spinalis (most medial)
Iliocostalisis (most lateral)
Longissimus (intermediate)

Question 12

Actions and description of the erector spinae?

Answer 12

Fibers run vertically and performs actions such as extension of all regions of vertebral column and side flexion

Question 13

Multifidus actions and description?

Answer 13

Acts as a segment stabiliser and helps with postural adjustment

Superficial fibers can contribute to extension side flexion and rotation

Question 14

Quadratus lumborum actions?

Answer 14

Acts as a lateral flexor to the same side, involved in maintenance of pelvis when standing one legged