1. Musculoskeletal Anatomy Quiz
The bones, muscles and muscular action below the belt…

2. What’s to Come Quick review of the bones
Origin, insertion, and action of muscles
Muscles categorized by their action
Test yourself with the diagram and click for the answer…
All images scanned from:
Sieg & Adams, Illustrated Essentials of Musculoskeletal Anatomy

3. Bones in Review

4. Pelvis (letters first)
Iliac crest
Iliac fossa
Superior (posterior) gluteal line
Middle (anterior) gluteal line
Inferior gluteal line
Anterior superior iliac spine
Anterior inferior iliac spine
Posterior superior iliac spine
Posterior inferior iliac spine
Greater sciatic notch
Ischial tuberosity
Ischial spine
Lesser sciatic notch
Ramus of ischium
Pubic crest
Pubic symphysis
Body of pubis
Superior ramus of pubis
Inferior ramus of pubis
Ilium
Ischium
Pubis
Acetabulum
Obturator foramen
Sacrum
Coccyx

5. Femur Head Neck Greater trochanter Lesser trochanter
Intertrochanteric line
Intertrochanteric crest
Trochanter fossa
Quatrate tubercle
Gluteal tuberosity
Linea aspera
Adductor tubercle
Medial epicondyle
Lateral epicondyle
Patellar surface
Medial supracondylar line
Lateral supracondylar line
Medial condyle
Lateral condyle
Popliteal surface
Intercondylar notch

6. Tibia and Fibula Styloid process Head Neck Interosseous border
Lateral malleolus
Shaft
Medial condyle
Lateral condyle
Tibial tuberosity
Soleal line
Medial malleolus

7. Foot (without animation)

8. Extensors of Spine

9. Spinalis thoracis / cervicis
spinous processes of T11-12, L1-2
transverse processes of T6-10
transverse processes of T1-6
Spinous processes of T1-8
Spinous processes of C6-7, T1-4
Spinous processes of C2-5
extend and rotate vertebral column
Origin
(3)
Insertion
Action

10. semispinalis thoracis / cervicus
spinous processes of T11-12, L1-2
transverse processes of T6-10
transverse processes of T1-6
Spinous processes of T1-8
Spinous processes of C6-7, T1-4
Spinous processes of C2-5
extend and rotate vertebral column
Origin
(3)
Insertion
Action

11. Leg / Hip Flexors

12. Psoas Major Origin Insertion Action
bodies, transverse processes lumbar vertebrae
lesser trochanter of femur
flexes and rotates thigh laterally
flexes vertebrae
Origin
Insertion
Action
(2)

13. Iliacus Origin Insertion Action iliac fossa of ilium
(2)
iliac fossa of ilium
lesser trochanter of femur
flexes and rotates thigh laterally
flexes vertebrae

14. Leg Extensors & Abductors

15. Gluteus Maximus Origin Insertion Action iliac crest, sacrum, coccyx
gluteal tuberosity of femur
extends and rotates thigh laterally

16. Gluteus Medius Origin Insertion Action lateral ilium
greater trochanter of femur
abducts thigh

17. Gluteus Minimus Origin Insertion Action lateral ilium
greater trochanter of femur
abducts thigh

18. Tensor Fasciae Latae Origin Insertion Action anterior iliac crest
tibia via iliotibial tract
abducts, flexes thigh

19. Leg Adductors

20. Adductor Longus Origin Insertion Action
pubic crest near symphysis pubis
linea aspera of femur
adducts, flexes thigh
Anterior

21. Adductor Magnus Origin Insertion Action ischial tuberosity pubis
linea aspera of femur
adductor tubercle
adducts femur
anterior fibers assist flexion of femur at hip
Posterior fibers assist extension of femur at hip
Origin
(2)
Insertion
Action
(3)

22. Gracilis Origin Insertion Action pubic ramus
(2)
pubic ramus
medial surface of tibial shaft
adducts thigh
flexes leg at knee

23. Leg Flexors

24. Biceps Femoris Origin Insertion Action long head - ischial tuberosity
short head - linea aspera of femur
head of fibula
lateral condyle of tibia
flexes knee
extends thigh
Origin
(2)
Insertion
Action

25. Semitendinosus Origin Insertion Action ischial tuberosity
(2)
ischial tuberosity
medial, proximal surface of tibia
flexes knee
extends thigh

26. Semimembranosus Origin Insertion Action ischial tuberosity
(2)
ischial tuberosity
medial condyle of tibia
flexes knee
extends thigh

27. Sartorius Origin Insertion Action anterior superior iliac spine
(2)
Action
anterior superior iliac spine
medial surface of tibia
proximal surface of tibia
flexes leg and thigh
rotates thigh laterally (crosses leg)

28. Leg Extensors

29. Rectus Femoris Origin Insertion Action anterior inferior iliac spine
patella by common tendon; continues as ligament to tibial tuberosity
extends leg at knee

30. Vestus: medialis, lateralis intermedius
anterior/medial surface femur
greater trochanter femur
anterior lateral shaft of femur
patella by common tendon; continues as ligament to tibial tuberosity
extends leg at knee
Origin
medialis
lateralis
intermedius
Insertion
Action

31. Dorsiflexors

32. Tibialis Anterior Origin Insertion Action
(2)
Action
lateral condyle/surface of tibia
1st meta tarsal
1st cuneiform
dorsiflexion
inversion of foot

33. Peroneus Tertius Origin Insertion Action distal third anterior fibula
(2)
distal third anterior fibula
5th metatarsal
dorsiflexion
eversion of foot

34. Extensor Digitorum Longus
Origin
(2)
Insertion
Action
(3)
lateral condyle of the tibia
anterior surface of fibula
dorsal surfaces of 2nd, 3rd phlanges of 4 lateral toes
dorsiflexion
eversion
toe extension

35. Plantar Flexors

36. Gastrocnemius Origin Insertion Action lateral/medial condyles of femur
(2)
lateral/medial condyles of femur
posterior surface of calcaneus
plantar flexion
flexion of leg at knee

37. Soleus Origin Insertion Action head/shaft of fibula
(2)
Insertion
Action
head/shaft of fibula
posterior tibial surface
posterior surface calcaneus
plantar flexion of foot

38. Flexor Digitorum Longus
Origin
Insertion
Action
(3)
posterior surface of tibia
distal phlanges of 4 lateral toes
plantar flexion
inversion of foot
flexion of four lateral toes

39. Tibialis Posterior Origin Insertion Action
(2)
Action
lateral condyle posterior tibial/fibular surface
tarsal bones
metatarsal bones
plantar flexion
inversion of foot

40. Peroneus Longus Origin Insertion Action lateral condyle of tibia
fibular head/shaft
tarsal
metatarsals
plantar flexion
eversion of foot
Origin
(2)
Insertion
Action

41. Muscles by Action

42. Hip / Leg Medial Rotator
Gluteus medius
Gluteus minimus
Tensor fasciae latae
Petineus
Adductor longus
Adductor brevis
Adductor magnus (horizontal fibers)

43. Leg Flexor & Extensor Flexors Extensors Gluteus maximus
Iliopsoas
Pectineus
Tensor fasciae latae
Adductor brevis
Adductor longus
Adductor magnus (anterior portion)
Rectus femoris
Sartorius
Extensors
Gluteus maximus
Biceps femoris (long head)
Semitendinosus
Semimembranosus
Adductor magnus (posterior portion)

44. Leg Adductors & Abductors
Gluteus medius
Gluteus minimus
Tensor fasciae latae
Sartorius
Adductors
Adductor brevis
Adductor longus
Adductor magnus
Gracilis

45. Knee Flexors Extensors Biceps femoris Semitendinosus Semimembranosus
Sartorius
Gracilis
Gastrocnemius
Extensors
Vastus lateralis
Vastus intermedius
Vastus medialis
Rectus femoris
Tensor fascia latae

46. Knee Rotators Medial Lateral Semitendinosus Semimembranosus Popliteus
Gracilis
sartorius
Lateral
Biceps femoris

47. Ankle Dorsiflexors Plantar flexors Tibialis anterior
Extensor digitorum longus
Peroneus tertius
Extensor hallucis longus
Plantar flexors
Gastrocnemius
Soleus
Plantaris
Peroneus longus
Peroneus brevis
Tibialis posterior
Flexor hallucis longus
Flexor digitorum longus (not shown)

48. Foot Evertors Invertors Peroneus tertius Peroneus longus
Peroneus brevis
Invertors
Tibialis anterior
Tibialis posterior