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Lower Extremity Anatomy > 4) Lateral Compartment of the Leg > Flashcards

4) Lateral Compartment of the Leg Flashcards

1
Q

Lateral compartment of the leg

A

Formed by fibula and anterior/posterior IM septa

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2
Q

Muscles of lateral compartment characteristics

A

Attach proximally to LATERAL tibular shaft

Evertors (aid in plantarflexion)

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3
Q

Innervation to lateral compartment muscles

A

Superficial fibular nerve

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4
Q

Blood supply to lateral compartment muscles

A

Perforating branches from fibular artery and anterior tibial
(branches pierce IM septa)
no major artery in compartment

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5
Q

Tendons of muscles of lateral compartment

A

Visible at lateral ankle, posterior to lateral malleolus

retromalleolar groove

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6
Q

Origin of Fibularis Longus

A

Fibular head and proximal 1/2 of lateral fibular shaft

Crural fascia

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7
Q

Insertion of Fibularis Longus

A

Lateral/plantar aspect of medial cuneiform and 1st met (tuberosity)

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8
Q

Fibularis Longus path

A

Posterior to lateral malleolus WITHIN fibular groove
Deep to superior fibular retinaculum
Inferior to peroneal (fibular) trochlea, deep to inferior fibular retinaculum
Fibular sulcus and groove of cuboid (inf surface), crosses sole of foot to insert on medial side

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9
Q

Groove of cuboid

A

Converted to tunnel by long plantar ligament

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10
Q

Function of Fibularis Longus

A

Eversion
Plantarflexion
Pronation of subtalar and midtarsal joints
Helps support 1st met during propulsion

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11
Q

Origin of Fibularis brevis

A

Distal 1/2 of lateral fibular shaft
Crural fascia
Med and inf to Fib Longus
Ant to Fib Longus (as they pass around Lat Malleolus)

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12
Q

Insertion of Fibularis Brevis

A

Styloid process of 5th met

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13
Q

Fibularis Brevis Path

A

Post to Lat Malleolus (Ant to Fib Longus tendon)
Deep to super fib retinaculum
Superior to peroneal (fibular) trochlea, deep to inferior fib retinaculum
Heading anteriorly toward insertion

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14
Q

Fibularis Brevis tendon

A

Anterior to fibularis longus tendon at ankle

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15
Q

Function of Fibularis Brevis

A

Eversion
Plantarflexion
(pronation of Subtalar Joint)

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16
Q

Peroneus (Fibularis) Quartus characteristic

A

Common ACCESSORY muscle

Can cause overcrowding of retromalleolar region/fibular groove

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17
Q

Overcrowding by Peroneous (FIbularis) Quartus

A

Can cause degen/dislocation of Fibularis brevis

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18
Q

Origin of Peroneus (Fibularis) Quartus

A

Actual muscle belly of fibularis brevis or longus

Lateral fibular shaft between origins of fibularis longus and brevis

19
Q

Insertion of Peroneus (Fibularis) Quartus

A

Retrotrochlear eminence (Cuboid and 5th met base)

20
Q

Fibular Synovial Sheath path

A

Immediately superior to Lat Malleolus (4cm above)
Divides at fibular trochlea
Ends at level of cuboid

21
Q

Tendons in the fibular synovial sheath

A

Share sheath proximally (passing post to lateral malleolus in retromalleolar groove)

22
Q

Fibular Synovial Sheath divide at fibular trochlea

A

separated by fascial extensions of inferior fibular retinaculum that attaches to peroneal trochlea

23
Q

Fibularis longus tendon’s synovial sheath

A

As it passes along plantar foot

May or may communicate with proximal fibular synovial sheath

24
Q

Fibular (Peroneal Retinacula)

A

Thickening of crural fascia and deep fascia of the foot (pedis fascia)
Anchors tendons of lateral compartment

25
Q

Superior Fibular Retinaculum

A

Continuous with superior extensor retinaculum (transverse crural ligament)

26
Q

Superior Fibular Retinaculum attaches

A

Posterinferior lateral malleolus and retrotrochlear eminence

pulley for tendons as they pass posterior to lateral malleolus

27
Q

Inferior Fibular Retinaculum

A

Continuous with stem of inferior extensor retinaculum (frondiform ligament)

28
Q

Inferior Fibular Retinaculum attaches

A

Sinus tarsi

Peroneal trochlea and lateral calcaneus

29
Q

Blood supply to Lateral compartment of the leg

A

Branches from fibular and anterior tibial arteries

penetrate through Ant and Post IM septa

30
Q

Nerve supply to Lateral compartment of the leg

A

Common Fibular Nerve (L4-S2)

31
Q

Common Fibular supply to Lateral compartment

A

From sciatic
Passes around fibular neck
Enters lateral compartment (through post IM septa)
Piereces through Fib Longus

32
Q

Common fibular terminal branches

A

Deep fibular

Superficial fibular

33
Q

Superficial fibular nerve

A

L4-S1

From common fibular in lateral compartment

34
Q

Superficial fibular nerve path

A

Descends between fibularis muscles (supplies lat comp muscles)
Pierces anterolateral crural fascia in distal 1/3 of leg (cutaneous innervation to distal anterolateral leg, dorsum of foot)

35
Q

Branches of superficial fibular nerve

A

Medial dorsal cutaneous nerve

Intermediate dorsal cutaneous

36
Q

Medial dorsal cutaneous nerve

A

Supplies cutaneous to medial hallux and adjacent 2nd and 3rd digit
Branches give rise to 3 digital branches

37
Q

Intermediate dorsal cutaneous

A

Supplies cutaneous to adjacent 3rd and 4th, 4th and 5th digits
Branches give rise to 4 digital branches

38
Q

Is lateral side of 5th digit innervated by Medial or Intermediate dorsal cutaneous?

A

N O

39
Q

Branches of medial and intermediate dorsal cutaneous nerve

A

ON PAPER (TOO COMPLICATED)

40
Q

Lateral dorsal cutaneous nerve

A

After lateral malleolus
Continuation of sural
Supplies lateral foot border

41
Q

Branch of lateral dorsal cutaneous

A

10th proper dorsal digital nerve (dorsolateral 5th toe)

Continuation of lateral dorsal cutaneous

42
Q

Saphenous nerve

A

Supplies:
Medial midfoot/arch
Medial ankle

43
Q

Medial dorsal cutaneous nerve

A

Crosses ankle centrally

Supplies dorsomedial foot

44
Q

Intermediate dorsal cutaneous nerve

A

Anterior to lateral malleolus

Supplies dorsolateral midfoot

Lower Extremity Anatomy (9 decks)

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