Muscular System Pt. 10 - Muscles of the Leg

Question 1

Origin of Popliteus

Answer 1

Lateral condlye of femur

Question 2

Insertion of Popliteus

Answer 2

Proximal Tibia

Question 3

Actions of Popliteus

Answer 3

Medial rotation of tibia

Unlock extended knee; popliteus unlocks knee joints before flexion of knee occurs

Question 4

Origin of Gastrocnemius

Posterior; crosses knee and ankle joint

Answer 4

Medial and lateral condyles of femur

Question 5

Insertion of Gastrocnemius

Answer 5

Calcaneus via calcaneal (achilles) tendon

Question 6

Actions of Gastrocnemius

Answer 6

Plantar flexion & Knee flexion

Plantar flexion because calcaneal tendon moves up towards origin

Question 7

Origin of Plantaris

Posterior

Answer 7

Above lateral femoral condyle of femur (deep to gastrocnemius)

Question 8

Insertion of Plantaris

Answer 8

Calcaneus via calcaneal tendon

Same as gastrocnemius

Question 9

Actions of Plantaris

Answer 9

Plantar flexion & Knee flexion

Question 10

Origin of Soleus

Posterior; does not cross knee joint

Answer 10

Head of fibula and medial tibia

Deep to gastrocnemius

Question 11

Actions of Soleus

Answer 11

Plantar flexion

Question 12

What are the muscles of the deep posterior muscles of the leg

Answer 12

1. Tibialis Posterior
2. Flexor Digitorum Longus
3. Flexor Hallucis Longus

All do plantar flexion of ankle; Tendons run medial for all three

Question 13

Origin of Tibialis Posterior

Answer 13

Tibia, Fibula, and Interosseus Membrane

Cross on medial side of heel

Question 14

Insertion of Tibialis Posterior

Answer 14

Broad attachment of plantar surface of foot

Question 15

Actions of Tibialis Posterior

Answer 15

Inversion of foot
Ankle Plantar Flexion

Question 16

Origin of Flexor Digitorum Longus

Answer 16

Posterior surface of tibia

Question 17

Insertion of Flexor Digitorum Longus

Answer 17

Distal phalanges of digits 2-5

Question 18

Actions of FDL (Flexor Digitorum Longus)

Answer 18

Ankle Plantar Flexion
Toe Flexion (all joints)

Question 19

Origin of Flexor Hallucis Longus

Answer 19

Posterior inferior surface of fibula

Question 20

Insertion of Flexor Hallucis Longus

Answer 20

Distal phalanx of big toe (hallux)

Question 21

Actinos of Flexor Hallucis Longus

Answer 21

Ankle Plantar flexion
Flexion of big toe (all joints of hallux)

Question 22

What are the muscles in the anterior muscles of the leg

Answer 22

1. Tibialis Anterior
2. Extensor Digitorum Longus
3. Extensor Hallucis Longus

Question 23

Origin of Tibialis Anterior

Answer 23

• Lateral condyle of tibia
• Tibia
• Interosseus membrane

Question 24

Insertion of Tibialis Anterior

Answer 24

• Metatarsal I
• Medial (Second) Cuneiform

Question 25

Actions of Tibialis Anterior

Answer 25

Ankle Dorsiflexion Foot Inversion

Question 26

Origin of Extensor Digitorum Longus

Answer 26

* Lateral condyle of tibia * Fibula * Interosseus membrane

Question 27

Insertion of Extensor Digitorum Longus

Answer 27

Middle and distal phalanges of digits 2-5

Question 28

Actions of Extensor Digitorum Longus

Answer 28

Ankle Dorsiflexion Extension of toes

Question 29

Origin of Extensor Hallucis Longus

Answer 29

* Anterior surface of fibula * Interosseus membrane

Question 30

Insertion of Extensor Hallucis Longus

Answer 30

Distal phalanx of big toe

Question 31

Actions of Extensor Hallucis Longus

Answer 31

Ankle Dorsiflexion Extension of big toe ## Footnote Extension of big toe includes metatarsal phalangeal and interphalangeal joints (in btwn. phalanges and metatarsals)

Question 32

What are the names of the Lateral Muscles of the Leg?

Answer 32

1. Peroneus (Fibularis) Longus 2. Peroneus (Fibularis) Brevis 3. Peroneus (Fibularis) Tertius ## Footnote Tertius sometimes considered apart of anterior group

Question 33

Origin of Fibularis Longus

Answer 33

Head and body of fibula ## Footnote Superficial to fibularis brevis

Question 34

Insertion of Fibularis Longus

Answer 34

* Metatarsal I * Medial (second) cuneiform ## Footnote Joint wraps underneath the heel and goes to the first metatarsal

Question 35

Actions of Fibularis Longus

Answer 35

* Ankle eversion * Plantar flexion ## Footnote Plantar flexion at the ankle

Question 36

Origins of Fibularis Brevis

Answer 36

Fibula

Question 37

Insertion of Fibularis Brevis

Answer 37

Base of fifth metatarsal

Question 38

Actions of Fibularis Brevis

Answer 38

* Ankle eversion * Plantar flexion

Question 39

Origin of Fibularis Tertius ## Footnote More anterior than lateral

Answer 39

* Distal surface of fibula * Interosseus membrane

Question 40

Insertion of Fibularis Tertius

Answer 40

Base of fifth metatarsal ## Footnote Similar to Fibularis Brevis

Question 41

Actions of Fibularis Tertius

Answer 41

* Ankle eversion * Dorsiflexion