LOWER MUSCLES Muscles of the thorax respiratory muscles

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. 3. 4. Internal Abdominal Oblique Action - Compress abdomen Rectus Abdominis Action - Flex vertebral column 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 maximus Action- Extend and laterally rotate thigh 2. Gluteus medius Action- Abduct and medially rotate thigh 3. Tensor fasciae latae Action- Abduct thigh 4. Adductor longus Action- Adduct thigh 5. Adductor brevis Action- adduct thigh 6. 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. 7. 8. 9. Gracilis Action- Flex leg Semitendinosus Action- Flex leg Semimembranosus Action- Flex leg Biceps femoris Action- 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