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Y1 - LEA Quiz- 9/10 > 9-1. Lateral Compartment Overview > Flashcards

9-1. Lateral Compartment Overview Flashcards

1
Q

other name for fibular?

other name for fibularis?

A
  • fibular = peroneal
  • fibularis = peroneus
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2
Q

course of the common peroneal/ fibular nerve in the posterior leg?

A

heads anterolaterally

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3
Q

the lateral compartment muscules are developmentally:

  1. dorsal/ ventral, and preaxial/ postaxial?
  2. innervation?
  3. action?
A
  • dorsal, postaxial muscles
  • innervated by composed of posterior division fibers
  • act: major foot evertors
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4
Q

course of the lateral compartment muscles

A
  • They travel posterior to the lateral malleolar sulcus
    • fibularis longus more superficially
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5
Q

relationship between fibularis longus and fibularis brevis in the lateral compartment?

A
  • Reaching the lateral side of the calcaneus, f. brevis travels above and f. longus travels below the peroneal/fibular trochlea/tubercle
  • Fibularis brevis and fibularis longus share a common synovial sheath up to the peroneal trochlea
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6
Q

If an os vesailanum is present, where will it be?

A
  • this is an accessory ossice
  • would be invested in the fibularis brevis
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7
Q

After fibularis longus travels below the peroneal/fibular trochlea/tubercle, what is it’s path?

A
  • F. longus will make its way to the lateral side of the cuboid where it travels through the peroneal notch, envelop its sesamoid (os peroneum)
  • Then travelS in close proximity to the peroneal sulcus
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8
Q

On rare occasions close to the insertion sites of the fibularis longus, there may be an accessory bone called what?

A

pars peronea metatarsalis primi

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9
Q

2 muscles of the lateral compartment

A
  • fibularis longus
  • fibularis brevis
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10
Q

which muscle belly fills most of superior half of lateral compartment becoming tendinous as it passes inferiorly?

A

Fibularis/ peroneus longus

(then runs superficially to Fibularis brevis down the leg)

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11
Q

Fibularis/ peroneus longus

  1. origin
  2. insertion
  3. innervation
  4. main action
A
  1. o: head and sup. 2/3 of lateral surface of fibula
  2. ins: base of 1st MT and medial cuneiform
  3. inn: superficial fibular nerve (L5, S1, S2)
  4. act: everts foot and weekly plantarflexes ankle
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12
Q

Fibularis/ peroneus brevis

  1. origin
  2. insertion
  3. innervation
  4. main action
A
  1. o:
    • inferior 2/3 of lateral surface of fibula
  2. ins:
    • dorsal 2/3 of lateral surface of fibula
  3. inn:
    • superficial fibular nerve (L5, S1, S2)
  4. act:
    • everts foot and weekly plantarflexes ankle
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13
Q

what is the common innervation of the lateral compartment?

A

superficial fibular nerve (L5, S1, S2)

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14
Q

which muscle belly fills the inferior half of lateral compartment?

A

fibularis/ peroneus brevis

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15
Q

In rare cases, what can happen with the fibularis longus and fibularis brevis tendons?

A

in rare occasions, the tendons can be fused

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16
Q

Do not confuse the fibularis brevis insertion site w/ that of the Fibularis tertius. Where does F. tertius insert?

A
  • F tertius inserts on the dorsum of the MT 5 base or proximal shaft
  • F brevis inserts on base of MT1 and medial cuneiform
17
Q

Where else can the fibularis brevis send a slip?

A

distally to the 5th toe directly, or by joining the EDLT (extensor digitorum longus tendon)

18
Q

which muscle is palpable from the fibular head to the lateral malleolus?

A

fibularis/ peroneus longus is palpable throughout most of its course in the leg

19
Q

INVERSION or EVERSION:

which contributes to foot pronation?

which muscles are involved?

A
  • EVERSION contributes to foot PRONATION
  • Muscles used are the accessory ankle plantarflexors
20
Q

what is the mnemonic:

remember, out of all the meninges, the PIAS DEEP

A
  • PIAS
    • Plantarflexion
    • Inversion
    • ADduction
    • Supination
  • DEAP
    • Dorsiflexion
    • Eversion
    • ABduction
    • Pronation
21
Q

During supination, which bones:

  1. INVERT
  2. PLANTARFLEX/ dorsiflex
  3. ADDUCT/ abduct
A

During supination,

  1. Inversion: calcaneus
  2. Plantarflex: calcaneus,navicular, cuboid
    • Dorsiflex: talus
  3. ADduct: calcaneus, navicular, cuboid
    • Abduct: talus
22
Q

during pronation, the following bones move during:

  1. EVERSION
  2. DORSIFLEXION, plantarflexion
  3. ABDUCTION, adduction
A
  1. EVERSION - calcaneus
  2. DORSIFLEXION - calcaneus, navicular, cuboid
    • plantarflexion - talus
  3. ABDUCTION - calcaneus, navicular, cuboid
    • adduction - talus
23
Q

what are the steps between the foot becoming a (1) mobile pronating adaptor –> (2) stiff lever for propulsion?

A

*Prior to becoming pronating adaptor, foot enters STANCE PHASE in a SUPINATED position

  1. mobile, pronating adaptor

As foot lowers to ground for FOOT FLAT, PRONATION occurs and continues into midstance

  1. stiff lever for propulsion

Late midstance to toe-off, the foot SUPINATES/ STIFF EVER

24
Q

what is the basic 3 step summary of stance phase?

A
25
Q

what is the function of the lateral compartment muscles during gait?

A
  • Both lateral compartment muscles are active PRIOR to initial contact
    • Prepares the foot for weight acceptance
    • Prevents excessive inversion at heel strike
26
Q

what is the function of the FIBULARIS LONGUS ONLY during gait?

A
  • Heel Strike to Foot Flat:
    • aids in the pronation necessary for foot to accommodate substrate
  • Midstance:
    • plantarflexes the first ray providing stability to this digit as weight is transferred to the forefoot
27
Q

lateral muscular compartment:

innervation and blood supply

A
  • inn: superficial fibular nerve
  • artery: from the anterior tibial and fibular arteries
28
Q

how often is the peroneus quartus present?

A
  • up to ~20% of study samples
  • various names, origin, and insertion
  • *unique to humans
29
Q

peroneus quartus:

potential origins,

potential insertions

A
  • Potential Origins:
    • lateral surface of the fibula below or above the origin of fibularis brevis,
    • posterior intermuscular septum, or
    • directly from either the fibularis brevis or longus muscle bellies
  • Potential Insertions:
    • retrotrochlear eminence,
    • peroneal tubercle,
    • inferior peroneal retinaculum,
    • cuboid, and
    • fibularis longus or brevis tendons
30
Q

what structure(s) needs to be protected while finding where the deep fibular and superficial fibular nerves split?

what may need to be cut?

A
  • may need to cut thru 1-2 muscles (fibularis longus, and extensor digitorum longus)
  • when making the incision, protect the common fibular and its branches
31
Q

what is usually the last branch off of the common fibular nerve before it terminates into superficial and deep fibular nerves? what is it’s course?

A
  • recurrent articular nerve branch is usually the last branch
    • runs w/ the anterior tibial recurrent artery
    • pierces the tibialis anterir muscle

Y1 - LEA Quiz- 9/10 (13 decks)

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