Abdomen

Question 1

External abdominal oblique:

1. origin
2. insertion
3. action
4. innervation

Answer 1

1. lower 8 ribs
2. iliac crest, ASIS, linea alba (aponeurosis)
3. compresses abdominal contents, flexes vertebral column, bends vertebral column laterally
4. intercostal nerves (T7-11) and subcostal nerve (T12)

Question 2

Internal abdominal oblique:

1. origin
2. insertion
3. action
4. innervation

Answer 2

1. iliac crest, thoracolumbar fascia
2. last 3-4 ribs, linea alba, pubic crest, pectineal line
3. compresses abdominal contents, flexes vertebral column, bends vertebral column laterally
4. intercostal nerves (T7-11), subcostal nerve (T12), iliohypogastric and ilioinguinal nerves (L1)

Question 3

Rectus abdominis:

1. origin
2. insertion
3. action
4. innervation

Answer 3

1. lateral - pubic crest, medial - pubic symphysis
2. cartilages of ribs 5-7, xiphoid process
3. flexes vertebral column
4. intercostal nerves (T7-11), subcostal nerve (T12)

Question 4

Cremaster:

1. origin
2. insertion
3. action
4. innervation

Answer 4

1. continuation of internal oblique
2. pubic tubercle & crest
3. pulls testes up
4. genital branch of genitofemoral nerve (L1-2)

Question 5

Quadratus lumborum:

1. origin
2. insertion
3. action
4. innervation

Answer 5

1. transverse processes of L3-5, iliolumbar ligament, iliac crest
2. lower border of rib 12, transverse processes of L1-3 vertebrae
3. laterally flexes trunk
4. subcostal nerve (T12 and L1-4)