1. 18

2. 19

4. Muscles crossing the hip and knee joints
Three groups separated by fascia; all three enclosed by deep fascia of thigh (fascia lata)
1. Anterior
Flex femur at hip; extend leg at knee (e.g. foreswing phase of walking)
2. Posterior
Mostly extend thigh and flex leg (backswing phase of walking)
3. Adductor (medial)
Move thigh only, not leg

5. Muscles that flex thigh at hip
Originate from vertebral column and pelvis and pass anterior to hip joint
Sartorius
Iliopsoas
Tensor fasciae lata
Rectus femoris (only quad with origin on pelvis)
Pectineus (medial compartment)

6. Muscles that flex thigh at hip: individually (go between last slide and this one)
Iliopsoas
Pectineus
Tensor fascia lata
Sartorius
Rectus femoris
Inserts on tibial tuberosity via patellar tendon

7. Thigh extensors (posterior)
Arise posterior to hip joint
Gluteus maximus
Hamstrings (cross hip and knee joints: extend thigh & flex knee)
Biceps femoris
Semitendinosus
Semimembranosus
(antagonists of quads)
_______

8. Hamstrings cross hip and knee joints: extend thigh and flex knee
Biceps femoris long head
Biceps femoris short head
Semitendinosus
Semimembranosus

9. Abductors of thigh Buttocks muscles that lie lateral to hip joint
Gluteus medius
Gluteus minimus (under medius)
Tensor fascia lata

10. Thigh abductors Buttocks muscles that lie lateral to the hip joint
Gluteus medius
Gluteus minimus

11. Lateral rotators Piriformis
Piriformis laterally rotates hip; also helps abduct hip if it is flexed
Piriformis
Also shown are other rotators and the gluteus muscles

12. Adduction of thigh Muscles originate medial to hip joint Gracilis
Adductor magnus
Adductor longus
Adductor brevis
Pectineus

13. Thigh adductors (originate medial to hip joint)
Adductor magnus
Pectineus
Adductor brevis
Gracilis
Adductor longus

14. Knee extensors
Quadraceps femoris – the only extensors of the leg (lower leg) at the knee
Rectus femoris (only quad with origin on pelvis)
Vastus lateralis
Vastus intermedius
Vastus medialis
Antagonized by hamstrings
Rectus femoris

15. Quadriceps Vastus lateralis, intermedius, and medialis
Rectus femoris
(only quad with origin on the pelvis)
Quadriceps
Vastus lateralis, intermedius, and medialis
Note “o” and “i”
_________
Insert: tibial tuberosity via patellar ligament

16. Leg (lower leg) 3 compartments Movements at joints: Anterior Posterior
Lateral
Movements at joints:
Ankle
Dorsiflex
Plantarflex
Intertarsal
Inversion of foot
Eversion of foot
Toes
Flex (point)
Extend

17. Posterior compartment of leg
Superficial: these plantarflex foot
Gastrocnemius
Soleus
Plantaris

18. Posterior leg Plantaris Soleus Gastrocnemius

19. Posterior leg continued
Deep
Popliteus
Flexor digitorum longus
Flexor hallucis longus
Tibilialis posterior

20. More pics Extensor hallucis longus Tibialis anterior
Extensor digitorum longus

21. Lateral compartment of leg
Fibularis (peroneus) longus:
to first metatarsal and cuneiform
Fibularis (peroneus) brevis:
to fifth metatarsal