Gastrocnemius: Origin
Posterior condyles of femur
Gastrocnemius: Insertion
Calcaneus via calcaneal tendon
Gastrocnemius: Action
- Flexes the knee
- Plantar flexes the ankle
Soleus: Origin
- Soleal line
- Posterior aspect of head of fibula
Soleus: Insertion
Calcaneus via calcaneal tendon
Soleus: Action
Plantar flexes the ankle
Tibialis Anterior: Origin
- Lateral condyle of tibia
- Proximal, lateral surface of tibia
- Interosseous membrane
Tibialis Anterior: Insertion
- Medial cuneiform
- Base of 1st metatarsal
Tibialis Anterior: Action
- Inverts the foot
- Dorsiflex the ankle
Fibularis/Peroneus Longus: Origin
- Head of fibula
- Proximal 2/3 of lateral fibula
Fibularis/Peroneus Longus: Insertion
- Medial cuneiform
- Base of 1st metatarsal
Fibularis/Peroneus Longus: Action
- Everts the foot
- Plantar flexes the ankle
Piriformis: Origin
Anterior surface of sacrum
Not papable - student should paplate the edge of sacrum
Piriformis: Insertion
Greater trochanter
Piriformis: Action
- Laterally rotate the hip
- Abduct the hip when flexed
Gluteus Maximus: Origin
- Coccyx
- Edge of sacrum
- Posterior iliac crest
- Sacrotuberous and sacroiliac ligaments
Gluteus Maximus: Insertion
- Iliotibial tract/IT band (upper fibers)
- Gluteal tuberosity (lower fibers)
Gluteus Maximus: Action
All fibers:
1. Extends the hip
2. Laterally rotate the hip
Lower fibers:
Adduct the hip
One action for each fiber direction
Tensor Fascia Latae (TFL): Origin
Iliac crest just posterior to the ASIS
Tensor Fascia Latae (TFL): Insertion
Iliotibial tract/IT band (attaches to the tibial/Gerdy’s tubercle)
Tensor Fascia Latae (TFL): Action
- Flexes the hip
- Medially rotates the hip
- Abducts the hip
Gluteus Medius: Origin
Gluteal surface of the ilium just below the iliac crest
Gluteus Medius: Insertion
Greater trochanter
Gluteus Medius: Action
All fibers:
1. Abduct the hip
2. Stabilize the hip
Anterior fibers
1. Flex the hip
2. Medially rotate the hip
Posterior fibers:
1. Extend the hip
2. Laterally rotate the hip
One action for each fiber direction
