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Muscles of the Legs
Muscles of the Legs, Origins, Insertions, and Actions
15
Anatomy
Undergraduate 2
10/18/2007

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Cards

Term
Iliopsoas
Definition

Origin: Illiac crest and lumbar vertebrae

Insertion: Leser trochanter of femor

Action: Flex trunk, lateral flexion of vertebral column 

Term
Pectineus
Definition

Origin: Pubis

Insertion: Inferior to lesser to lesser trocanter

Action: Addcts, flexs, and medially roates thigh 

Term
SSaTensor fasciae latae
Definition

Origin: Illiac crest and illiac spine

Insertion: Illiotibial tract

Action: Flexes, abducts and medially rotates thigh; steadies trunk 

Term
Sartorius
Definition

Origin: Anterior superior illiac spine

Insertion: Via aponeurosis medial aspect of proximal tibia

Action: flexes, abducts, and laterally rotates thigh 

Term
Adductor longus
Definition

Origin: body of the pubis, lateral to symphasis

Insertion: Mid femor

Action: adducts and flexes the thigh, and helps latterally rotate the hip joint 

Term
Gracillis
Definition

Origin: pubic symphasis, pubis

Insertion: Medial surface of tibial shaft

Action: flexes the knee, adducts the thigh 

 

Term
Biceps femoris
Definition

Origin: Long head: Ischial tuberosity

           Short head: lateral supracondylar ridge of femor

Insertion: fibular head

Action: flexes knee, and also rotates the tibia laterally; long head also extends the hip joint 

Term
Semitendinosus
Definition

Origin: posterior portion of the ischial tuberosity

Insertion: tibial shaft

action: extends the thigh and flexes the knee 

Term
Tibialis anterior
Definition

origin: lateral condyle of tibia

insertion: base of first metatarsal

action: dorsiflexor of ankle and invertor of foot 

Term
Soleus
Definition

Origin: posterior aspect of fibular head

Insertion: Eventually unites with the gastronemius aponerosis to for the Achilles tendon, inserting on the middle 1/3 of the posterior calcaneal surface

Action: powerful plantar flexor of ankle 

Term
Gastronemius
Definition

Origin: medial head: medial femoral condyle

insertion: the two heads unite into a proad aponeirosis which eventually unites with the deep tendon of the soleus to for the Achilles tendon, inserting on the middle 1/3 of the calcaneal surface

 

action: powerfu plantar flexor of the ankle 

Term
Vasus Medialis
Definition

origin: inferior portion of intertrochanteric line

insertion: medial base and border of patella

action: extends the knee

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