Muscle chart: Leg

Question 1

Extensor Digitorum Longus

Origin

Insertion

Action

Innervation

Answer 1

Origin:

• Anterior Fibula
• Lateral Tibial Condyle
• Interosseous Membrane

Insertion:

• Base of Middle Phalanges 2-5
• Base of Distal Phalanges 2-5

Action:

• Ankle Dorsiflexion
• Evert Inter-tarsal
• Extension Metatarsal 2-5
• Extension Interphalangeal 2-5

Innervation:
-Deep Fibular Nerve

Question 2

Extensor Hallucis Longus

Origin

Insertion

Action

Innervation

Answer 2

Origin:

• Medial Fibula
• Interosseous Membrane

Insertion:
-Base of 1st Distal Phalanx

Action:

• Dorsiflex Ankle
• Evert/Invert Intertarsal
• Extension Metatarsal Phalange 1
• Extension Interphalange 1

Innervation:
-Deep Fibular Nerve

Question 3

Fibularis (Poroneus) Longus

Origin

Insertion

Action

Innervation

Answer 3

Origin:

• Proximal Lateral Fibula
• Head of Fibula

Insertion:

• Medial Cuneiform
• Base of 1st Metatarsal

Action:

• Ankle Plantar Flexion
• Evert Intertarsal

Innervation:
-Superficial Fibular Nerve

Question 4

Fibularis (Peroneus) Brevis

Origin

Insertion

Action

Innervation

Answer 4

Origin:

• Distal Lateral Fibula
• Interosseous Membrane

Insertion:
-Base of 5th Metatarsal

Action:

• Ankle Plantar-flexion
• Evert Intertarsal (STJ)

Innervation:
-Superficial Fibular Nerve

Question 5

Fibularis (Peroneus) Tertius

Origin

Insertion

Action

Innervation

Answer 5

Origin:
-Distal Anterior Fibula w/Extensor Digitorum Longus

Insertion:
-Base of 5th Metatarsal

Action:

• Ankle Dorsiflexion
• Evert Intertarsal (STJ)

Innervation:
-Deep Fibular Nerve

Question 6

Soleus

Origin

Insertion

Action

Innervation

Answer 6

Origin:

• Soleal Line of tibia
• Head/Neck of Fibula

Insertion:
-Calcaneal tuberosity Via Achilles Tendon

Action:

• Ankle Plantar Flexion
• Invert Intertarsal (STJ)

Innervation:
-Tibial Nerve

Question 7

Gastrocnemius

Origin

Insertion

Action

Innervation

Answer 7

Origin:
-Medial & Lateral Epicondyle Femur

Insertion:
-Calcaneal Tuberosity Via Achilies Tendon

Action:

• Ankle Plantar Flexion
• Invert Intertarsal (STJ)
• Knee Flexion

Innervation:
-Tibial Nerve

Question 8

Plantaris

Origin

Insertion

Action

Innervation

Answer 8

Origin:
-Lateral Epicondyle Femur

Insertion:
-Cancaneal Tuberosity Via Achilles Tendon

Action:

• Ankle Plantar Flexion
• Knee Flexion
• Invert Intertarsal (STJ)

Innervation:
-Tibial Nerve

Question 9

Tibialis Posterior

Origin

Insertion

Action

Innervation

Answer 9

Origin:

• Posterior Tibia
• Interosseous Membrane
• Posterior Fibula

Insertion:

• Navicular
• Medial Cuneiform
• Lateral Cuneiform
• Intermediate Cuneiform
• Base of Metatarsals 2-4

Innervation:
-Tibial Nerve

Question 10

Flexor Digitorum Longus

Origin

Insertion

Action

Innervation

Answer 10

Origin:
-Middle Posterior Tibia

Insertion:
-Base of Distal Phalanges 2-5

Action:

• Ankle Plantar Flexion
• Invert Intertarsal (STJ)
• Flex Metatarsal Phalange 2-5
• Flex Inner-Phalange 2-5

Innervation:
-Tibial Nerve

Question 11

Flexor Hallucis Longus

Origin

Insertion

Action

Innervation

Answer 11

Origin:
-Distal Posterior Fibula

Insertion:
-Base of 1st Distal Phalanx

Action:

• Ankle Plantar Flexion
• Invert Intertarsal (STJ)
• Flex MTP 1
• Flex IP 1

Innervation:
-Tibial Nerve

Question 12

Tibialis Anterior

Origin

Insertion

Action

Innervation

Answer 12

Origin:

• Upper Lateral Tibia
• Interosseous Membrane

Insertion:
-Medial Cuniform

Action:

• Ankle Dosriflexion
• Invert Intertarsal
• Subtalar Joint STJ

Innervation:
-Deep fibular nerve

Question 13

Name all the Tibia Internal Rotators

5 Total

Answer 13

1. Sartorius
2. Gracillis
3. Semi-Membranosus
4. Semitendinosis
5. Popliteus

Question 14

Name all the Tibia External Rotators

2 Total

Answer 14

1. Biceps Femoris (Long Head)

2. Biceps Femoris (short Head)