4) Lateral Compartment of the Leg

Question 1

Lateral compartment of the leg

Answer 1

Formed by fibula and anterior/posterior IM septa

Question 2

Muscles of lateral compartment characteristics

Answer 2

Attach proximally to LATERAL tibular shaft

Evertors (aid in plantarflexion)

Question 3

Innervation to lateral compartment muscles

Answer 3

Superficial fibular nerve

Question 4

Blood supply to lateral compartment muscles

Answer 4

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

Question 5

Tendons of muscles of lateral compartment

Answer 5

Visible at lateral ankle, posterior to lateral malleolus

retromalleolar groove

Question 6

Origin of Fibularis Longus

Answer 6

Fibular head and proximal 1/2 of lateral fibular shaft

Crural fascia

Question 7

Insertion of Fibularis Longus

Answer 7

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

Question 8

Fibularis Longus path

Answer 8

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

Question 9

Groove of cuboid

Answer 9

Converted to tunnel by long plantar ligament

Question 10

Function of Fibularis Longus

Answer 10

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

Question 11

Origin of Fibularis brevis

Answer 11

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)

Question 12

Insertion of Fibularis Brevis

Answer 12

Styloid process of 5th met

Question 13

Fibularis Brevis Path

Answer 13

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

Question 14

Fibularis Brevis tendon

Answer 14

Anterior to fibularis longus tendon at ankle

Question 15

Function of Fibularis Brevis

Answer 15

Eversion
Plantarflexion
(pronation of Subtalar Joint)

Question 16

Peroneus (Fibularis) Quartus characteristic

Answer 16

Common ACCESSORY muscle

Can cause overcrowding of retromalleolar region/fibular groove

Question 17

Overcrowding by Peroneous (FIbularis) Quartus

Answer 17

Can cause degen/dislocation of Fibularis brevis

Question 18

Origin of Peroneus (Fibularis) Quartus

Answer 18

Actual muscle belly of fibularis brevis or longus

Lateral fibular shaft between origins of fibularis longus and brevis

Question 19

Insertion of Peroneus (Fibularis) Quartus

Answer 19

Retrotrochlear eminence (Cuboid and 5th met base)

Question 20

Fibular Synovial Sheath path

Answer 20

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

Question 21

Tendons in the fibular synovial sheath

Answer 21

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

Question 22

Fibular Synovial Sheath divide at fibular trochlea

Answer 22

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

Question 23

Fibularis longus tendon’s synovial sheath

Answer 23

As it passes along plantar foot

May or may communicate with proximal fibular synovial sheath

Question 24

Fibular (Peroneal Retinacula)

Answer 24

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

Question 25

Superior Fibular Retinaculum

Answer 25

Continuous with superior extensor retinaculum (transverse crural ligament)

Question 26

Superior Fibular Retinaculum attaches

Answer 26

Posterinferior lateral malleolus and retrotrochlear eminence | pulley for tendons as they pass posterior to lateral malleolus

Question 27

Inferior Fibular Retinaculum

Answer 27

Continuous with stem of inferior extensor retinaculum (frondiform ligament)

Question 28

Inferior Fibular Retinaculum attaches

Answer 28

Sinus tarsi | Peroneal trochlea and lateral calcaneus

Question 29

Blood supply to Lateral compartment of the leg

Answer 29

Branches from fibular and anterior tibial arteries | penetrate through Ant and Post IM septa

Question 30

Nerve supply to Lateral compartment of the leg

Answer 30

Common Fibular Nerve (L4-S2)

Question 31

Common Fibular supply to Lateral compartment

Answer 31

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

Question 32

Common fibular terminal branches

Answer 32

Deep fibular | Superficial fibular

Question 33

Superficial fibular nerve

Answer 33

L4-S1 | From common fibular in lateral compartment

Question 34

Superficial fibular nerve path

Answer 34

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)

Question 35

Branches of superficial fibular nerve

Answer 35

Medial dorsal cutaneous nerve | Intermediate dorsal cutaneous

Question 36

Medial dorsal cutaneous nerve

Answer 36

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

Question 37

Intermediate dorsal cutaneous

Answer 37

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

Question 38

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

Answer 38

N O

Question 39

Branches of medial and intermediate dorsal cutaneous nerve

Answer 39

ON PAPER (TOO COMPLICATED)

Question 40

Lateral dorsal cutaneous nerve

Answer 40

After lateral malleolus Continuation of sural Supplies lateral foot border

Question 41

Branch of lateral dorsal cutaneous

Answer 41

10th proper dorsal digital nerve (dorsolateral 5th toe) | Continuation of lateral dorsal cutaneous

Question 42

Saphenous nerve

Answer 42

Supplies: Medial midfoot/arch Medial ankle

Question 43

Medial dorsal cutaneous nerve

Answer 43

Crosses ankle centrally | Supplies dorsomedial foot

Question 44

Intermediate dorsal cutaneous nerve

Answer 44

Anterior to lateral malleolus | Supplies dorsolateral midfoot