SHEATHS II Flashcards

1
Q

name this sheath of the anterior crural compartment

  • extends from just proximal to the transverse crural ligament to midway between the bands of the cruciate crural ligament
  • passes within the transverse crural ligament and the upper band of the
    cruciate crural ligament; begins and ends most proximal
A

Tibialis Anterior Synovial Sheath

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2
Q

name this sheath of the anterior crural compartment

  • extends from just proximal to the upper band of the cruciate crural
    ligament (near the level of the malleoli) to the base of the first metatarsal - begins and ends more distally than the synovial sheath of the tibialis
    anterior tendon
  • passes within the cruciate crural ligament
A

Extensor Hallucis Longus Synovial Sheath

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3
Q

name this sheath of the anterior crural compartment

  • the 4 slips of the extensor digitorum longus tendon and the tendon of
    peroneus tertius muscles are enclosed within the same synovial sheath; begins more narrowly and expands distally; short when compared to the
    other two synovial sheaths of the extensor compartment
  • extends from just proximal to the upper band of the inferior extensor retinaculum (the level of the malleoli) to the level of the base of the
    fifth metatarsal
  • passes within the cruciate crural ligament
A

Extensor Digitorum Longus and Fibularis Tertius / Peroneus Tertius
Synovial Sheath

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4
Q

name this sheath of the lateral crural compartment

  • extends from a level just superior to the lateral malleolus to the level of the cuboid; passes deep to both the superior and inferior fibular / peroneal retinacula
  • the inferior fibular retinaculum has fibers that attach to the fibular tubercle and splits the synovial sheath as the tendons pass around the fibular tubercle
A

Fibular / Peroneal Synovial Sheath

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5
Q

name this sheath of the lateral crural compartment

  • extends plantarly across the foot
  • may be a continuation of the combined fibular synovial sheath or a separate sheath

*subtype of the fibular/peroneal synovial sheath

A

Fibularis Longus Synovial Sheath

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6
Q

name this sheath of the posterior crural compartment

i. Proximal Sheath
- surrounds the flexor digitorum longus tendon as it courses posterior to
the ankle joint and into the plantar foot
- begins posterior to the medial malleolus and ends proximal to the knot
of Henry
- passes within the laciniate ligament

ii. Distal Sheaths
- a second sheath is present and surrounds each of the four tendons as
they pass along the plantar aspects of the lesser digits from the
metatarsophalangeal joints to the middle phalanges

A

Flexor Digitorum Longus Synovial Sheaths

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7
Q

name this sheath of the posterior crural compartment

i. Proximal Sheath
- surrounds the flexor hallucis longus tendon as it courses posterior to
the medial malleolus and inferior to the sustentaculum tali
- begins at the distal end of the tibia and ends at the knot of Henry
- begins and ends most distally
- passes within the flexor retinaculum

ii. Distal Sheath - surrounds the flexor hallucis longus tendon as it passes along the plantar aspect of the hallux from the metatarsal head to the central proximal phalanx

A

Flexor Hallucis Longus Synovial Sheaths

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8
Q

name this sheath of the posterior crural compartment

  • surrounds the tibialis posterior tendon as it courses posterior to the ankle joint
  • begins at the proximal posterior medial malleolus and ends after passing
    through the porta pedis
  • begins and ends most proximally
  • passes within the laciniate ligament
A

Tibialis Posterior Synovial Sheath

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