lateral compartment of the leg

Question 1

subtalar joint

Answer 1

talus and calcaneus

Question 2

Lateral malleolus comprises what dermatomes?

Answer 2

S1 and L5

Question 3

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

Answer 3

small saphenous vein and sural nerve

Question 4

What retinaculum covers the lateral compartment?

Answer 4

superior and inferior peroneal retinaculum

Question 5

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

Answer 5

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

Question 6

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

Answer 6

Calcaneofibular ligament

Question 7

What is contained in the lateral osteofascial compartment?

Answer 7

Superficial fibular nerve, fib brevis and fib longus

Question 8

What is the main blood supply to the lateral compartment?

Answer 8

branches of the fibular and anterior tibial arteries

Question 9

What is the common action/fxn?

Answer 9

eversion of foot and weak ankle plantarflexion

Question 10

Where does the fibular artery begin?

Answer 10

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

Question 11

What artery gives off lateral calcaneal branches?

Answer 11

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

Question 12

What are the origins of fibularis longus?

Answer 12

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

Question 13

Fib longus tendon runs posterior to what structure of the ankle

Answer 13

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

Question 14

What are the insertions of fib longus?

Answer 14

Mainly MT 1 base, medial cuneiform

Question 15

What are the actions of Fib longus?

Answer 15

everts foot, weak plantarflexion

Question 16

What are the origins of fib brevis?

Answer 16

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

Question 17

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

Answer 17

anterior and within the malleolar sulcus

Question 18

What is the insertion of fib brevis?

Answer 18

lateral dorsum of MT 5’s tuberosity

Question 19

what are the actions of fib brevis?

Answer 19

everts the foot , weakly plantarflexes the foot

Question 20

Answer 20

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

Question 21

Answer 21

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

Question 22

Answer 22

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

Question 23

What is the attachment site for the posterior intermuscular membrane?

Answer 23

post border of the fibula

Question 24

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

Answer 24

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)

Question 25

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

Answer 25

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

Question 26

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

Answer 26

It will be invested in Fib. brevis

Question 27

How does F longus travel down the lateral compartment?

Answer 27

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.

Question 28

On rare occasions, there may be an accessory bone close to its insertion sites called\_\_\_\_\_\_\_\_\_\_

Answer 28

The pars peronea metatarsalis primi

Question 29

What is the origin, inn and insertion of FLongus?

Answer 29

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

Question 30

What is the main action of fib brevis and longus?

Answer 30

everts foot and weakly plantarflexes the ankle

Question 31

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

Answer 31

FL runs superficially to FB down the leg

Question 32

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

Answer 32

peroneus longus

Question 33

What does eversion contribute to ?

Answer 33

pronation ( Pro Bed ) abduction eversion dorsiflexion

Question 34

Supination corresponds with .....

Answer 34

plantarflexion, inversion, adduction Out of all the meninges, the PIAS DEAP

Question 35

Supination and inversion of the calcaneus causes what movements?

Answer 35

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

Question 36

With pronation, what movements occur?

Answer 36

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

Question 37

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

Answer 37

pronation occurs, the foot supinates

Question 38

stance phase includes:

Answer 38

initial contact/heel strike: supination foot flat to midstance: pronation ( pronating adaptor) heel up to toe off: supination (stiff lever)

Question 39

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

Answer 39

excessive inversion at heel strike

Question 40

During gait, Fibularis longus ONLY does what??

Answer 40

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.

Question 41

Lateral compartment muscles receive blood supply from where?

Answer 41

anterior tibial and fibular arteries

Question 42

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

Answer 42

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

Question 43

What are the rami of the common fibular nerve?

Answer 43

L4-S2