LOWER MUSCLES

Muscles of the thorax (respiratory muscles)

1. Internal Intercostals Action - Depress ribs

2. External Intercostal Action - Elevate ribs

Muscles of the abdominal wall

1. External Abdominal Oblique Action - Compress abdomen 2. Internal Abdominal Oblique

Action - Compress abdomen3. Rectus Abdominis

Action - Flex vertebral column4. Transverse Abdominis

Action - Compress abdomen

Muscles of the abdominal wall

Muscles that act on the vertebral column

1. Erector Spinae Group Action - Extends head and vertebral column

Muscles that act on the thigh

1. Gluteus maximusAction- Extend and laterally rotate thigh

2. Gluteus mediusAction- Abduct and medially rotate thigh

3. Tensor fasciae lataeAction- Abduct thigh

4. Adductor longus Action- Adduct thigh5. Adductor brevis Action- adduct thigh6. Adductor magnus

Action- Adduct thigh

Muscles that act on the thigh

Muscles that act on the leg

1. Rectus Femoris Action - Extend leg

2. Vastus Lateralis Action - Extend leg

3. Vastus Medialis Action - Extend leg

4. Vastus Intermedialis Action - Extend leg

5. Sartorius Action - Medially rotates leg

6. GracilisAction- Flex leg

7. SemitendinosusAction- Flex leg

8. SemimembranosusAction- Flex leg

9. Biceps femorisAction- Flex leg

Muscles that act on the Leg

Muscles that act on the foot/toes

1. Gastrocenemius Action - Plantar flex foot

2. Soleus Action - Plantar flex foot

3. Peroneus Longus Action - Plantar flex and everts foot

4. Peronius Brevis Action - Plantar flex and evert foot

5. Extensor Digitorum Longus Action - Extend digits 2-5

6. Tibialis Anterior Action - Dorsiflex foot

7. Flexor Digitorum Brevis Action - Flex digits 2-5

8. Flexor Digitorum Longus Action - Flex digits 2-5

Muscles that act on the foot/toes