Abdominal muscles

Question 1

Rectus Abdominis origin?

Answer 1

pubic crest & symphysis

Question 2

External oblique origin?

Answer 2

outer surface of lower 8 ribs

Question 3

Internal oblique origin?

Answer 3

lumbar fascia, iliac crest, & inguinal ligament

Question 4

Transverse abdominis origin?

Answer 4

inguinal ligament, lumbar fascia, cartilages of last 6 ribs, iliac crest

Question 5

Rectus Abdominis insertion?

Answer 5

xyphoid process & costal cartilages of ribs 5-7

Question 6

External oblique insertion?

Answer 6

linea alba via aponeurosis

Question 7

Internal oblique insertion?

Answer 7

linea alba, pubic crest, last 3 or 4 ribs, & costal margin

Question 8

Transverse abdominis insertion?

Answer 8

linea alba, pubic crest

Question 9

Rectus Abdominis action?

Answer 9

• flex & rotate lumbar region of vertebral column
• fix & depress ribs
• stabilize pelvis during
   walking
• increase intra-abdominal
   pressure

Question 10

External oblique action?

Answer 10

• when together, synergist to rectus abdominis, flex vertebral column & com- press abdominal wall
• when alone, synergist to muscles of back, roate & lateral flexion of trunk

Question 11

Internal oblique action?

Answer 11

• when together, synergist to rectus abdominis, flex vertebral column & com- press abdominal wall
• when alone, synergist to muscles of back, roate & lateral flexion of trunk

Question 12

Transverse abdominis action?

Answer 12

• compresses abdominal contents

Question 13

What are the innervations of abdominal muscles?

Answer 13

Intercostal nerves