Muscles O/I/A - Lower Extremity

Question 1

Vastus Lateralis

AND

Vastus Medialis

Answer 1

O: Linea Aspera

I: Tibial Tuberosity via patella tendon

A: Knee Extension

Question 2

Vastus Intermedius

Answer 2

O: Anterior Femur

I: Tibial Tuberosity via patella tendon

A: Knee Extension

Question 3

Gastrocnemius

Answer 3

O: Medial and Lateral Condyles of Femur

I: Posterior Calcaneus

A: Knee Flexion, Ankle Plantar Flexion

Question 4

Soleus

Answer 4

O: Posterior Tibia and Fibula

I: Posterior Calcaneus

A: Plantar Flexion of ankle

Question 5

Tibialis Posterior

Answer 5

O: Interosseous membrane, adjacent Tibia and Fibula

I: Navicular and most tarsals and metatarsals

A: Ankle Inversion, assist Plantar Flexion

Question 6

Peroneus Brevis

Answer 6

O: Lateral Distal Fibula

I: Base of 5th Metatarsal

A: Ankle Eversion, assist Plantar Flexion

Question 7

Peroneus Longus

Answer 7

O: Lateral Proximal Fibula and interosseous membrane

I: Plantar surface of 1st Cuneiform and 1st Metatarsal

A: Anlke eversion, assist Plantar Flexion

Question 8

Tibialis Anterior

Answer 8

O: Lateral Tibia, Interosseous membrane

I: 1st Cuneiform and 1st Metatarsal

A: Ankle Inversion and Dorsiflexion

Question 9

Lumbricales (action only)

Answer 9

A: Flexes MP joints and extends PIP and DIP joints of toes 2-5

Question 10

Flexor Hallucis Brevis (Action only)

Answer 10

A: Flexes MP joint of great toe

Question 11

Extensor Digitorum Brevis (I & A only)

Answer 11

I: Middle phalanx of toes 2-4

A: Extends MP, PIP, nd DIP joints of toes 2-4

Question 12

Extensor Digitorum Longus (I & A only)

Answer 12

I: Distal phalanx of 4 lesser toes

A: Extends 4 lesser toes, assist Dorsiflexion

Question 13

Flexor Digitorum Longus (I & A only)

Answer 13

I: Distal phalanx of four lesser toes

A: Flexion of four lesser toes; assist inversion and plantar flexion

Question 14

Flexor Digitorum Brevis (I & A only)

Answer 14

I: Middle phalanx of toes 2-5

A: Flexes MP and PIP joits of toes 2-5