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LEA FINAL EXAM > lateral compartment of the leg > Flashcards

lateral compartment of the leg Flashcards

1
Q

subtalar joint

A

talus and calcaneus

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2
Q

Lateral malleolus comprises what dermatomes?

A

S1 and L5

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3
Q

What two structure running in the superficial fascia are posterior to the incision site?

A

small saphenous vein and sural nerve

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4
Q

What retinaculum covers the lateral compartment?

A

superior and inferior peroneal retinaculum

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5
Q

What is the relationship of the fibularis brevis and longus to the fibular trochlea of the calcaneus?

A

brevis is superficial (anterior) to the trochlea, longus is deep (inferior)

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6
Q

What ligament would need to be cut transversely to open the talocalcaneal joint capsule?

A

Calcaneofibular ligament

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7
Q

What is contained in the lateral osteofascial compartment?

A

Superficial fibular nerve, fib brevis and fib longus

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8
Q

What is the main blood supply to the lateral compartment?

A

branches of the fibular and anterior tibial arteries

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9
Q

What is the common action/fxn?

A

eversion of foot and weak ankle plantarflexion

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10
Q

Where does the fibular artery begin?

A

It arises from the posterior tibial artery at 2.5 cm distal to the inferior border of popliteus.

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11
Q

What artery gives off lateral calcaneal branches?

A

posterior lateral malleolar artery from the fibular artery, from the posterior tibial artery

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12
Q

What are the origins of fibularis longus?

A

head and sup 2/3 of lateral surface of fibular shaft, ant and post intermuscular septa, crural fascia, lat tib condyle, ASTFL

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13
Q

Fib longus tendon runs posterior to what structure of the ankle

A

Lateral malleolus, then runs inferior to peroneal trochlea to peroneal notch, traveling in close correspondence with the peroneal sulcus.

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14
Q

What are the insertions of fib longus?

A

Mainly MT 1 base, medial cuneiform

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15
Q

What are the actions of Fib longus?

A

everts foot, weak plantarflexion

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16
Q

What are the origins of fib brevis?

A

inferior 2/3s of lateral surface of fibula , ant and post intermuscular septa

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17
Q

Fib brevis tendons runs ant or post to the FL around the lat malleolus?

A

anterior and within the malleolar sulcus

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18
Q

What is the insertion of fib brevis?

A

lateral dorsum of MT 5’s tuberosity

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19
Q

what are the actions of fib brevis?

A

everts the foot , weakly plantarflexes the foot

20
Q
A

C- Tibialis anterior D - extensor digitorum longus E- fibularis longus

21
Q
A

C- Tibialis anterior D- extensor digitorum longus O- Extensor hallucis longus J- Ant tib vessels and deep fib nerve, E- Fibularis longus P- fibularis brevis N- fibular vessels

22
Q
A

R- medial malleolus C- tibialis anterior O- extensor hallucis longus, D- extensor digitorum lognus and fibularis tertius, E- fibularis longus P- fibularis brevis Q- achilles tendon

23
Q

What is the attachment site for the posterior intermuscular membrane?

A

post border of the fibula

24
Q

What do we know about the muscles of the lateral compartment?

A

developmentally dorsal (post axial) muscles innervated by a nerve that is composed of posterior division fibers, major evertors, they travel posterior to the lat malleolar sulcus f. longus more superficial)

25
Q

On the lateral side of the calcaneus, how do f brevis and longus travel?

A

brevis travels above and longus travels below the peroneal trochlea. The two share a common synovial sheath up to the peroneal trochlea

26
Q

If there is an os vesalianum, where will it be invested?

A

It will be invested in Fib. brevis

27
Q

How does F longus travel down the lateral compartment?

A

It makes its way to the lateral side o f the cuboid where it travels through the peroneal notch, envelop its sesamoid (os peroneum) and then travels in close proximity to its peroneal sulcus.

28
Q

On rare occasions, there may be an accessory bone close to its insertion sites called__________

A

The pars peronea metatarsalis primi

29
Q

What is the origin, inn and insertion of FLongus?

A

supeiror 2/3 of lateral surface of fibula, superficial fibular nerve (L5-S2), insertion: base of 1st MT and medial cuneiform

30
Q

What is the main action of fib brevis and longus?

A

everts foot and weakly plantarflexes the ankle

31
Q

How does the peroneus longus run in relation to Fib brevis down the leg?

A

FL runs superficially to FB down the leg

32
Q

What muscle is palpable throughout much of its course in the leg?

A

peroneus longus

33
Q

What does eversion contribute to ?

A

pronation ( Pro Bed ) abduction eversion dorsiflexion

34
Q

Supination corresponds with …..

A

plantarflexion, inversion, adduction

Out of all the meninges, the PIAS DEAP

35
Q

Supination and inversion of the calcaneus causes what movements?

A

adduction of calcaneus, navicular, and cuboid, plantarflexion of the calcaneus, navicular and cuboid. *** TALUS moves in opposite direction so talus abducts and dorsiflexes

36
Q

With pronation, what movements occur?

A

the calcaneus everts, calcaneus, navic, cuboid dorsiflex, calc, navic, cub abduct. *** TALUS plantarflexes and adducts

37
Q

As the foot lowers to the ground for foot flat, _____ occurs and continues to midstance. Late midstance to toe-off , the foot __________.

A

pronation occurs, the foot supinates

38
Q

stance phase includes:

A

initial contact/heel strike: supination

foot flat to midstance: pronation ( pronating adaptor)

heel up to toe off: supination (stiff lever)

39
Q

During gait, both lateral compartment muscles are active prior to initital contact to prepare the foot for weight acceptance and to prevent _____________

A

excessive inversion at heel strike

40
Q

During gait, Fibularis longus ONLY does what??

A

aids in the pronation necessary for foot to accomodate, at midstance plantarflexes the first ray providing stability to this digit as weight is transferred to the forefoot.

41
Q

Lateral compartment muscles receive blood supply from where?

A

anterior tibial and fibular arteries

42
Q

Which branch is last off of the common fibular nerve before the nerve terminates into superficial and deep?

A

recurrent articular nerve. It runs with the ant tibial recurrent artery and also pierces the tibialis anterior m.

43
Q

What are the rami of the common fibular nerve?

A

L4-S2

44
Q
A
45
Q
A

LEA FINAL EXAM (4 decks)

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