Anatomy: Legs

Muscles of Posterior Thigh

MuscleAttachementsNerve SupplyActions
Semitendinosus (Hamstring) O:Ischial Tuberosity
I: Medial surface of superior part of tibia
Tibial Nerve (Branched from Sciatic Nerve)-Extend hip,
– Flex knee, and
– Medially rotated
Semimembranosus (Hamstring) O: Ischial tuberosity
I: Posterior part of medial condyle of tibia
Tibial Nerve ( Branched from Sciatic Nerve)Extend hip,
– Flex knee, and
– Medially rotated
Biceps FemorisO: Long Head : Ischial tuberosity,
Short head: Linea aspera and lateral supracondylar line of femur
I: Lateral side of head of fibula
Long Head : Tibial Nerve, Short head: Fibular Nerve– Flexes knee and
– Lateral rotation of knee
– Extends hip
Tensor Fasciae LataeO: Anterior superior iliac spine along anterior part of iliac crest
I: ITB
Superior Gluteal Nerve– Flexes Hip

Muscles of Anterior Thigh

MusclesAttachementsNerve Supply Actions
Rectus femoris (Quadriceps)O: Anterior Inferior Iliac Spine
I: Quadriceps tendon
Femoral Nerve– Extends knee joint
– Stabilizes hip joint
Vastus lateralis (Quadriceps)O: Greater Trochanter and lateral lip of linea aspera of femur
I: Quadriceps tendon
Femoral Nerve– Extends the knee joint
Extends the knee joint (Quadriceps)O: Intertrochanteric line and medial lip of linea aspera of femur
I: Quadriceps tendon
Femoral Nerve– Extend the knee joint
Vastus intermedius (Quadriceps)O: Anterior and lateral surface of femoral shaft
I: Quadriceps tendon
Femoral Nerve– Extends the knee joint
SartoriusO: Anterior Superior Iliac Spine
I: Superior part of medial surface of tibia
Femoral Nerve– Flexes hip
– Abducts hip
– Laterally rotates hip and
-Flexes knee

Medial Compartment of Thigh

MusclesAttachementNerve Supply Action
Adductor LongusO: Body of pubis inferior along pubic crest I: Middle third of linea aspera of the femurObturator nerve– Adducts the hip
Adductor BrevisO: Inferior ramus of pubis
I: Pectineal line and proximal part of linea aspera of the femur
Obturator Nerve– Adducts hip
Adductor MagnusO: Adductor part: Inferior ramus of pubis, ramus of ischium.
O: Hamstring part: Ischial Tuberosity
I: Adductor tubercle
Adductor part: Obturator Nerve Hamstring part: Tibial Nerve – Adducts hip
– Flexes hip
– Hamstring portion: Extends hip
Gracillis O: Body of inferior ramus of pubis
I: Superior part of medial surface of tibia
Obturator Nerve– Adducts hip,
– Flexes knee,
– Assists in medial rotation of hip
Obturator ExternusO: Obturator foramen
I: Trochanteric fossa of femur
Obturator nerve– Laterally rotation of hip

Anterior and Lateral Compartments of the Leg

Muscles AttachementsNerve Supply Actions
Tibialis AnteriorO: Lateral condyle and superior half of the tibia
I: Medial and inferior surfaces of medial cuneiform and base of first metatarsal
Deep Fibular Nerve– Dorsiflexes ankle
– Inverts ankle
– Supprots medial longitudinal arch of foot
Extensor Hallucis LongusO: Middle part of anterior surface of fibula
I: Dorsal aspect of distal phalanx of the big toe
Deep Fibular Nerve– Extends the big toe
– Dorsiflexes ankle
Extensor Digitorum LongusO: Lateral condyle of tibia
I: Middle and distal phalanges of lateral four digits
Deep Fibular Nerve– Extends lateral four digits
– Dorsiflexes ankle
Fibularis LongusO: Head and superior two thirds of lateral surface of fibula
I: Base of first metatarsal and medial cuneiform
Superficial Fibular Nerve-Everts ankle
– Supports Transverse arch of the foot
Fibularis BrevisO: Inferior two thirds of lateral surface of fibula I: Dosral surface of tuberosity of base of 5th metatarsalSuperficial Fbular Nerve– Evert ankle

Posterior Compartment of Leg

Muscles Attachements Nerve Supply Actions
Tibialis PosteriorO: Interosseous membrane, posterior surface of tibia
I: Tuberosity of the navicular, cuneiforms, cuboid and bases of 2nd- 4th metatarsals
Tibial Nerve– Plantarflexes ankles,
– Inverts ankle
GastrocnemiusO: Lateral head: Lateral aspect of lateral condyle of femur
Medial Head: Popliteal surface of femur I: Achilles tendon
Tibial Nerve– Plantarflexes ankle when knee is extended,
– Flexes knee
SoleusO: Soleal Line of tibia
I: Achilles tendon
Tibial Nerve– Plantarflexes ankle
Flexor Hallucis LongusO: Inferior two thirds of posterior surface of fibula
I: Base of distal phalanx of the big toe
Tibial Nerve– Flexes big toe
Flexor Digitorum LongusO: Medial part of posterior surface of tibia
I: Bases of distal phalanges of lateral four digits
Tibial Nerve– Flexes lateral four digits.
– Supports longitudinal arches of the foot

Want to learn how to self-massage these areas? Click here.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s