The Leg Flashcards

1
Q

Which two long bones make up the osteology of the leg?

A

Tibia and Fibula

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2
Q

Anteriorly, which long bone is most lateral?

A

Fibula

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3
Q

From superior to inferior, what are the main features of the tibia?

A
Intercondylar eminence
Lateral and medial condyles
Tibial tuberosity
Shaft and IO border
Fibular Notch
Medial malleolus
Talar Articular Surface
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4
Q

Which feature can be seen on the posterior surface of the tibia?

A

Soleal Line

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5
Q

What is acute osetomyelitis?

A

A new bone infection

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6
Q

Where is the tibia unprotected?

A

Anteromedially

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7
Q

Why is the tibia the commonest long bone to be fractured?

A

Unprotected anteromedially

Slender in its lower third

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8
Q

What is a compound injury?

A

When the bone breaks in such a way that fragments stick out through the skin or the wound penetrates down to open bone

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9
Q

Why is the tibia good for donation for bone grafts?

A

Extensive subcutaneous surface

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10
Q

From superior to inferior, what are the main features of the fibula?

A
Superior tibiofibular articular surface
Head of fibula
Neck of fibula
Shaft of fibula
Lateral malleolus
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11
Q

What are the functions of the interosseous membrane in the leg?

A

A form of fibrous going which separates the muscles of anterior and posterior compartments as well as unite the long bones of the leg. Also acts as a site for muscle attachment

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12
Q

What is the function of the superior aperture in the interosseous membrane?

A

Passage of the anterior tibial vessels

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13
Q

What is the function of the inferior aperture in the interosseous membrane?

A

Passage of the anterior perineal vessels

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14
Q

Which muscles are in the anterior compartment of the leg?

A

Tibialis anterior
Extensor digitorum longs
Extensor hallucis longus
Fibularis tertius

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15
Q

What is the collective function of the muscles in the anterior compartment of the leg?

A

Dorsiflexion and inversion at the ankle

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16
Q

Which nerve innervates the muscles of the anterior compartment?

A

The deep fibular nerve (L4-L5)

17
Q

Which vessel supplies the muscles of the anterior compartment?

A

Anterior tibial artery

18
Q

Which of the 4 muscles in the anterior compartment is the strongest dorsiflexor of the foot?

A

Tibialis anterior

19
Q

What are the attachments of tibialis anterior?

A

Originates from the lateral surface of the tibia

Inserts on the medial cuneiform and the base of metatarsal I

20
Q

What is the arrangement of the muscles in the anterior compartment, from superficial to deep?

A

Tibialis anterior
Extensor Digitorum Longus
Extensor Hallucis Longus
(Fibularis tertius) - not present in all individuals

21
Q

Which muscle in the anterior compartment is not present in all individuals?

A

Fibularis tertius

22
Q

What are the attachments of extensor digitorum longus?

A

Originates from the lateral condyle of the tibia and the medial surface of the fibula

The fibres converge into a tendon, which travels to the dorsal surface of the foot. The tendon splits into four, each inserting onto the middle and distal phalynx of the lateral 4 toes

23
Q

What are the attachments of extensor hallucis longus?

A

Originates from the medial surface of the fibular shaft. The tendon crosses anterior to the ankle joint and attaches to the base of the distal phalanx of the great toe

24
Q

What are the attachments of fibulas tertius?

A

Originates with the extensor digitorum longus from the medial surface of the fibula. The tendon descends with the EDL, until they reach the dorsal surface of the foot. The fibularis tertius tendon then diverges and attaches to metatarsal V

25
Q

What is the function of fibularis longus?

A

Eversion and dorsiflexion of the foot

26
Q

Which muscle must be retracted in order to access the anterior tibial artery?

A

Extensor digitorum longus

27
Q

Describe the origin and course of the anterior tibial artery

A

Arises from the popliteal artery and passes from the posterior to anterior compartment via the superior hiatus in the interosseous membrane

28
Q

What is the deep fibular nerve a branch of?

A

The common fibular nerve

29
Q

What are the two muscles in the lateral compartment of the leg?

A

Fibularis (peroneus) longus

Fibularis (peroneus) brevis

30
Q

Where do the tendons of the muscles of the lateral compartment pass in relation to the lateral malleolus

A

Posterior

31
Q

What are the attachments of fibularis longus?

A

Origin: Superior and lateral surface of the fibula and the lateral tibial condyle

Insertion: As a tendon, to the medial cuneiform and base of metatarsal 1

32
Q

What are the actions of fibularis longus?

A

Eversion and plantarflexion of the foot. Also supports the lateral and tranverse arches of the foot.

33
Q

What is the innervation of fibularis longus?

A

Superficial fibular (perineal) nerve (L4-S1)

34
Q

What are the attachments of fublaris brevis

A

It originates from the inferior and lateral surface of the fibular shaft. The muscle belly forms a tendon, which descends with the fibularis longus tendon. It travels into the foot, posterior to the lateral malleolus, passing over the calcaneus and the cuboidal bones. The tendon of the fibularis brevis attaches to a tubercle on metatarsal V

35
Q

What are the actions of fubularis bravis?

A

Eversion of the ankle

36
Q

What is the innervation of fibularis brevis?

A

Superior fibular (perineal) nerve L4-S1

37
Q

What is the arrangement of the tendons from the muscles of the posterior compartment of the leg at the medial malleolus, anterior to posterior.

A

Tom, Dick And Very Nervous Harry

Tibialis posterior
flexor Digitorum longus
posterior tibial Artery
posterior tibial Vein
tibial Nerve
flexor Hallicus longus