leg muscles

The leg musculature is divided into three regions:

• Previous Region
• Lateral Region
• posterior region

Previous Region

1. ANTERIOR TIBIAL

Proximal Insertion : Lateral condyle of the tibia and ½ proximal of the lateral surface of the tibia and interosseous membrane
Distal Insertion : Medial cuneiform and base of 1st metatarsal
Innervation : Deep Fibular Nerve (L4 – S1)
Action : Dorsal Flexion and Inversion of the Foot

2. LONG EXTENDER OF THE FINGERS

Proximal Insertion : Lateral condyle of tibia, proximal ¾ of fibula and interosseous membrane
Distal Insertion : Middle and distal phalanx of 2nd to 5th fingers
Innervation : Deep Fibular Nerve (L4 – S1)
Action : Extension of MF, IFP and IFD from 2nd to 5th fingers

3. HALUX LONG EXTENDER

Proximal Insertion : 2/4 fibula intermediates and interosseous membrane
Distal Insertion: Distal phalanx of hallux
Innervation : Deep Fibular Nerve (L4 – S1)
Action : Extension of the hallux, dorsiflexion and inversion of the foot

4. FIBULAR THIRD

Proximal Insertion : Distal 1/3 of the anterior surface of the fibula
Distal Insertion : Base of 5th metatarsal
Innervation : Deep Fibular Nerve (L5 – S1)
Action : Foot Eversion

Lateral Region

1. FIBULAR SHORT

Proximal Insertion : Distal 2/3 of the lateral aspect of the fibula

Distal Insertion : Base of 5th metatarsal
Innervation : Superficial Fibular Nerve (L4 – S1)
Action : Plantar flexion and foot eversion

2. FIBULAR LONG

Proximal Insertion : Head, proximal 2/3 of lateral surface of fibula and lateral condyle of tibia
Distal Insertion : 1st metatarsal and medial cuneiform
Innervation : Superficial Fibular Nerve (L4 – S1)
Action : Plantar flexion and foot eversion

Posterior Region - Surface Layer

1. MEDIAL GASTROCNEMIO

Proximal Insertion : Medial condyle of the femur
Distal Insertion : Calcaneus
Innervation : Tibial Nerve (S1 - S2)
Action : Knee Flexion and Ankle Plantar Flexion

2. SIDE GASTROCNEMIO

Proximal Insertion : Lateral condyle of the femur
Distal Insertion : Calcaneus
Innervation : Tibial Nerve (S1 - S2)
Action : Knee Flexion and Ankle Plantar Flexion

3. SOLE

Proximal Insertion : Intermediate 1/3 of medial aspect of tibia and head of fibula
Distal Insertion : Calcaneus (gastrocnemius tendon)
Innervation : Tibial Nerve (L5 - S1)
Action : Ankle Plantar Flexion

4. PLANTING SMALL

Proximal Insertion : Lateral condyle of the femur
Distal Insertion : Calcaneus
Innervation : Tibial Nerve (L4 - S1)
Action : Helps the Triceps Surae

Posterior Region - Deep Layer

1. POPLITEUS

Proximal Insertion : Lateral condyle of the femur
Distal Insertion : Solear line of the posterior surface of the tibia
Innervation : Tibial Nerve (L4 - S1)
Action : Flexion and medial rotation of the knee

2. FINGERS LONG FLEXOR

Proximal Insertion : Posterior surface of tibia
Distal Insertion : Distal phalanges of the 2nd to 5th finger
Innervation : Tibial Nerve (L5 – S1)
Action : Plantar Flexion and Ankle Inversion, MF Flexion, IFP and IFD of the 2nd to 5th Toes

3. LONG HALUX FLEXOR

Proximal Insertion : Distal 2/3 of the posterior surface of the fibula and interosseous membrane
Distal Insertion: Distal phalanx of hallux
Innervation : Tibial Nerve (L5 – S2)
Action : Flexion of the hallux, plantar flexion and inversion of the ankle

4. TIBIAL HEAD

Proximal Insertion : Posterior surface of tibia and proximal 2/3 of fibula and interosseous membrane
Distal Insertion : 3 cuneiform (medial, middle and lateral), cuboid, navicular and base of 2nd to 4th metatarsals
Innervation : Tibial Nerve (L5 and S1)
Action : Plantar flexion and foot inversion

LEG MUSCLES Anterior View - Superficial Dissection

Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.

LEG MUSCLES Anterior View - Deep Dissection

Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.

LEG MUSCLES Side view

Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.

LEG MUSCLES Posterior View - Superficial Dissection

Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.

LEG MUSCLES Posterior View - Intermediate Dissection

Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.

LEG MUSCLES Posterior View - Deep Dissection

Source: NETTER, Frank H.. Atlas of Human Anatomy. 2nd edition Porto Alegre: Artmed, 2000.