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Hip,Thigh,Leg,&Foot
Muscle,Origin, Insertion, and Action
Muscle | Origin | Insertion | Action |
---|---|---|---|
Iliopsoas | Origin Iliac Fossa Lumbar Vertebrae | Insertion Femur (lesser trochanter) | Flexion of hip. Assists in abduction & lateral rotation of thigh |
Gluteus Maximus | Origin Ilium Sacrum Coccyx | Insertion Femur (greater trochanter & ITB) | Forceful extention of hip. Lateral rotation of extended hip. |
Gluteus Medius | Origin Ilium | Insertion Femur | Abducts and rotates thigh medially |
Gluteus Minimus | Origin Ilium | Insertion Femur | Abducts & rotates thigh medially; stabilizes pelvis on femur |
Tensor Fasciae Latae | Origin Ilium | Insertion Tibia | Assists abduction of thigh & braces knee in walking |
Quadratus Lumborum | Origin Iliac Crest | Insertion Lumbar Vertebrae | Raises hip or lateral flexion of trunk |
Piriformis | Origin Anterior Sacrum | Insertion Femur | Rotates thigh outward. Abducts & extends thigh |
Adductor Brevis | Origin Pubic Bone | Insertion Femur | Adducts thigh |
Adductor Longus | Origin Pubic Bone | Insertion Femur | Adducts thigh |
Adductor Magnus | Origin Pubic Bone | Insertion Femur | Adducts thigh |
Muscle Gracilis | Origin Pubic Bone | Insertion Tibia | Adducts thigh; assists flexion & medial rotation of flexed knee |
Sartorius | Origin Ilium | Insertion Tibia | Weakly flexes thigh & leg; adducts leg. Rotates thigh laterally & leg medially. Assists in crossing of the leg. |
Rectus Femoris | Origin Ilium Acetabulum of Femur | Insertion Tibia | Action Flexes thigh; extends leg at knee |
Vastus Lateralis | Origin Femur | Insertion Tibia | Extends leg at knee |
Vastus Medialis | Origin Femur | Insertion Tibia | Extends leg at knee |
Vastus Intermedius | Origin Femur | Insertion Tibia | Extends leg at knee |
Biceps Femoris | Origin Ischial Tuberosity, Femur | Insertion Fibula | Flexes & Rotates leg laterally and extends thigh |
Semitendinosus | Origin Ischial Tuberosity | Insertion Tibia | Flexes & rotates leg medially and extends thigh |
Semimembranosus | Origin Ischial Tuberosity | Insertion Tibia | Flexes & rotates leg medially and extends thigh |
Gastrocnemius | Origin Femur | Insertion Calcaneus | Extends foot (plantar flexion), or flexes lower leg |
Soleus | Origin Tibia Fibula | Insertion Calcaneus | Extends foot (strongest plantar flexor of the ankle) |
Tibialis Anterior | Origin Tibia | Insertion Tarsal Metatarsal | Dorsiflexion of ankle; inversion of foot. Contributes to forming the arch of foot |
Tibialis posterior | Origin Tibia Fibula | Insertion Tarsal Metatarsal | Plantar flexion of ankle; inversion of foot. Contributes to forming the arch of foot |
Popliteus | Origin Femur | Insertion Tibia | Initiates "unlocking" of extended knee by medial rotation of tibia |