Leg muscles

Leg Muscles

The leg musculature is divided into three regions:

• Previous Region
• Lateral Region
• Later Region

Previous Region

1. PREVIOUS TIBIAL

Proximal Insertion: Lateral tibial condyle and proximal ½ of tibial lateral face and interosseous membrane
Distal Insertion: Medial cuneiform and base of the 1st metatarsal
Innervation: Deep Fibular Nerve (L4 & #8211; S1)
Action: Dorsal Flexion and Inversion of the Foot

2. FINGER EXTENDER

Proximal Insertion: Lateral tibial condyle, proximal fibula and interosseous membrane
Distal Insertion: Middle and distal phalanx of the 2nd to 5th fingers
Innervation: Deep Fibular Nerve (L4 & #8211; S1)
Action: Extension of MF, IFP and IFD from 2nd to 5th fingers

3. HALUX LONG EXTENSOR

Proximal Insertion: 2/4 intermediate fibula and interosseous membrane
Distal Insertion: Distal Hallux Phalanx
Innervation: Deep Fibular Nerve (L4 & #8211; S1)
Action: Hallux Extension, Dorsal Flexion, and Foot Inversion

4. THIRD FIBER

Proximal Insertion: 1/3 distal to the anterior aspect of the fibula
Distal Insertion: Base of the 5th metatarsal
Innervation: Deep Fibular Nerve (L5 & #8211; S1)
Action: Foot Eversion

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Lateral Region

1. SHORT FIBER

Proximal Insertion: 2/3 distal to the lateral aspect of the fibula

Distal Insertion: Base of the 5th metatarsal
Innervation: Superficial Fibular Nerve (L4 & #8211; S1)
Action: Plantar Flexion and Foot Eversion

2. LONG FIBER

Proximal Insertion: Head, 2/3 proximal to the lateral surface of the fibula and lateral tibial condyle
Distal Insertion: 1st metatarsal and medial cuneiform
Innervation: Superficial Fibular Nerve (L4 & #8211; S1)
Action: Plantar Flexion and Foot Eversion

Later Region – Surface layer

1. MEDIAL GASTROCNEMIUM

Proximal Insertion: Medial condyle of the femur
Distal Insertion: Calcaneal
Innervation: Tibial Nerve (S1 & #8211; S2)
Action: Knee Flexion and Plantar Ankle Flexion

2. SIDE GASTROCNEMIUM

Proximal Insertion: Femoral lateral condyle
Distal Insertion: Calcaneal
Innervation: Tibial Nerve (S1 & #8211; S2)
Action: Knee Flexion and Plantar Ankle Flexion

3. SOLID

Proximal Insertion: 1/3 middle of tibial medial face and fibular head
Distal Insertion: Calcaneal (gastrocnemius tendon)
Innervation: Tibial Nerve (L5 & #8211; S1)
Action: Plantar Ankle Flexion

4. SLANT PLANTING

Proximal Insertion: Femoral lateral condyle
Distal Insertion: Calcaneal
Innervation: Tibial Nerve (L4 & #8211; S1)
Action: Helps the Sural Triceps

Posterior Region & #8211; Deep layer

1. POPLITE

Proximal Insertion: Femoral lateral condyle
Distal Insertion: Sole line of the posterior tibial surface
Innervation: Tibial Nerve (L4 & #8211; S1)
Action: Knee Flexion and Medial Rotation

2. LONG FLEXOR OF FINGERS

Proximal Insertion: Posterior face of tibia
Distal Insertion: Distal Phalanges of 2nd to 5th Finger
Innervation: Tibial Nerve (L5 & #8211; S1)
Action: Plantar Flexion and Ankle Inversion, MF Flexion, IFP and IFD 2nd to 5th Fingers

3. HALUX LONG FLEXOR

Proximal Insertion: 2/3 distal to the posterior surface of the fibula and interosseous membrane
Distal Insertion: Distal Hallux Phalanx
Innervation: Tibial Nerve (L5 & #8211; S2)
Action: Hallux Flexion, Plantar Flexion and Ankle Inversion

4. AFTER TIBIAL

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

Leg Muscles Previous View & #8211; Superficial Dissection

FSource: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.

Leg Muscles Previous View & #8211; Deep Dissection

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

Leg Muscles Side view

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

Leg Muscles Rear View & #8211; Superficial Dissection

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

Leg Muscles Rear View & #8211; Intermediate Dissection

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

Leg Muscles Rear View & #8211; Deep Dissection

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

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