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LEA > LEA Origins, Insertions, Actions > Flashcards

LEA Origins, Insertions, Actions Flashcards

1
Q

muscles in first plantar layer

A

abductor hallucis, flexor digitorum brevis, abductor digiti minimi

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2
Q

abductor hallucis origin: bone

A
  1. medial process of calcaneal tuberosity
  2. tuberosity of navicular
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3
Q

abductor hallucis origin: soft tissue

A

deep surface of plantar aponeurosis, deep surface of flexor retinaculum

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4
Q

abductor hallucis fibers blend with

A

medial tendon of FHB, extensor hood

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5
Q

abductor hallucis tendon attaches

A

base of the 1st proximal phalanx

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6
Q

flexor digitorum brevis origin: bone

A

medial process of calcaneal tuberosity

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7
Q

flexor digitorum brevis origin: soft tissue

A

deep surface of plantar aponeurosis

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8
Q

flexor digitorum brevis: course, insertion

A
  • tendon divides into 4 tendons, 1/digit
  • each tendon then splits at the base of a proximal phalanx to allow for passage of FDL tendon
  • tendon rejoins at head of proximal phalanx, inserts at plantar surface of shaft of middle phalanx
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9
Q

flexor digitorum brevis function

A

plantarflexion of proximal, middle phalanges of lesser digits

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10
Q

abductor digiti minimi origin: bone

A
  • lateral margin of medial process of calcaneal tuberosity
  • medial process of calcaneal tuberosity
  • tuberosity of 5th met base
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11
Q

abductor digiti minimi: soft tissue origin

A

deep surface of plantar aponeurosis

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12
Q

abductor digiti minimi: insertion

A

lateral side of base of 5th proximal phalanx

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13
Q

abductor digiti minimi course

A

distal, along lateral side of foot

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14
Q

abductor digiti minimi: action

A

abducts 5th digit, keeps 5th digit in sagittal plane during gait cycle

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15
Q

muscles in second plantar layer

A

quadratus plantae, lumbricals

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16
Q

quadratus plantae: origin

A
  • lateral head: inferior surface of calcaneus, distal to lateral process
  • medial head: medial surface of calcaneus, below groove for tendon of FHL
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17
Q

quadratus plantae: insertion

A

tendon of flexor digitorum longus

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18
Q

quadratus plantae: course

A
  • two heads are initially split by long plantar ligament
  • two heads join together before inserting into tendon of FDL
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19
Q

quadratus plantae: action

A

assists FDL in plantarflexion of lesser digits by pulling tendon of FDL during contraction

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20
Q

first lumbrical: origin

A

medial side of first tendon of FDL

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21
Q

first lumbrical: insertion

A

medial side of extensor wing, extensor trifurcation of first tendon of EDL (2nd digit)

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22
Q

first lumbrical: courses

A

in first interspace, inferior to deep transverse metatarsal ligament

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23
Q

second lumbrical: origin

A

adjacent sides of first and second tendons of FDL

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24
Q

second lumbrical: insertion

A

medial side of extensor wing, extensor trifurcation of 2nd tendon of EDL (3rd digit)

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25
Q

second lumbrical: courses

A

in second interspace, inferior to deep transverse metatarsal ligament

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26
Q

third lumbrical: origin

A

adjacent sides of 2nd and third tendons of FDL

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27
Q

third lumbrical: insertion

A

medial side of extensor wing, extensor trifurcation of third tendon of EDL ( fourth digit)

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28
Q

third lumbrical: courses

A

in third interspace, inferior to deep transverse metatarsal ligament

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29
Q

fourth lumbrical: origin

A

adjacent sides of 3rd and 4th tendon of FDL

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30
Q

fourth lumbrical: insertion

A

medial side of the extensor hood, extensor trifurcation of the 4th tendon of EDL (5th digit)

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31
Q

lumbricals: action

A

plantarflexes proximal phalanx, dorsiflexes middle and distal phalanges

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31
Q

fourth lumbrical: courses

A

in fourth interspace, inferior to deep transverse metatarsal ligament

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32
Q

flexor hallucis brevis: bony origin

A

lateral arm:
- plantar surface of the cuboid, posterior to the fibular groove
- lateral cuneiform

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33
Q

flexor hallucis brevis: soft tissue origin

A

medial arm: from plantar component of tibialis posterior tendon

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34
Q

flexor hallucis brevis: bone insertion

A

plantar surface of 1st proximal phalanx base

35
Q

flexor hallucis brevis: medial portion blends w/

A

abductor hallucis, extensor hood, plantar plate
- contains medial sesamoid

36
Q

flexor hallucis brevis: lateral portion blends w/

A
  • conjoined tendon of adductor hallucis
  • extensor hood, plantar plate
37
Q

flexor hallucis brevis: course

A

towards 1st met head, divides into 2 tendons

38
Q

flexor hallucis brevis: action

A

plantarflexes 1st proximal phalanx, keeps met head on ground during push-off

39
Q

muscles in third plantar layer

A

flexor hallucis brevis, flexor digiti minimi brevis, adductor hallucis

40
Q

adductor hallucis: bony origin

A

oblique head: plantar surface of 2nd-4th met bases

41
Q

adductor hallucis: soft tissue origin

A

oblique head: tendon of peroneus longus
transverse head: plantar plates of MTPs 3-5, DTM ligament

42
Q

adductor hallucis: fibers blend w/

A

lateral FHB tendon, lateral sesamoid, plantar plate, extensor hood

43
Q

adductor hallucis: tendon insertion

A

lateroplantar aspect of base of 1st proximal phalanx

44
Q

adductor hallucis: course

A

tendons unite to form conjoined tendon, courses through split in deep transverse metatarsal ligament

45
Q

adductor hallucis: action

A
  • adducts and plantarflexes hallux
  • assists in pulling met heads together
46
Q

flexor digiti minimi brevis: bony origin

A

plantar surface of 5th met base

47
Q

flexor digiti minimi brevis: soft tissue origin

A

tendon sheath of peroneus longus

48
Q

flexor digiti minimi brevis: insertion

A

lateroplantar aspect of 5th proximal phalanx

49
Q

flexor digiti minimi: course

A

distal, slightly lateral

50
Q

flexor digiti minimi: action

A

plantarflexes 5th proximal phalanx

51
Q

extensor hallucis brevis: bony origin

A

calcaneal portion of sinus tarsi

52
Q

extensor hallucis brevis: soft tissue origin

A
  • interosseous talocalcaneal ligament (in canal)
  • stem of deep surface of inferior extensor retinaculum
53
Q

extensor hallucis brevis: insertion

A

dorsum of base of first proximal phalanx

54
Q

extensor hallucis brevis: course

A

obliquely, lateral to medial
- deep to EHL
- crosses over dorsalis pedis artery

55
Q

extensor hallucis brevis: action

A

dorsiflexion of first MPJ

56
Q

extensor digitorum brevis: bony origin

A

calcaneal portion of sinus tarsi

57
Q

extensor digitorum brevis: soft tissue origin

A

interosseous talocalcaneal ligament (in canal)
- stem of deep surface of inferior extensor retinaculum

58
Q

extensor digitorum brevis: insertion

A
  • lateral side of EDL at level of base of proximal phalanges 2-4
59
Q

extensor digitorum brevis: course

A
  • obliquely, lateral to medial, deep to tendons of EDL
  • divides into 3 tendons
60
Q

extensor digitorum brevis: action

A

assists in dorsiflexion of the phalanges of digits 2-4

61
Q

tibialis anterior: insertions

A
  • medial side of anterior tubercle on plantar surface of medial cuneiform
  • base of first metatarsal
62
Q

tibialis anterior: clinical correlation

A

tibialis anterior weakness is most common cause of foot drop

63
Q

peroneus tertius: insertion

A

dorsum of base of 5th metatarsal

64
Q

lumbrical weakness: what happens?

A
  • limited dorsiflexion at IPJs, plantarflexion at MPJs
65
Q

first plantar interosseous: origin

A
  • inferior surface of base and medial surface of shaft of 3rd metatarsal
66
Q

first plantar interosseous: insertion

A

medial base of 3rd proximal phalanx

67
Q

second plantar interosseous: origin

A

inferior surface of base, medial surface of shaft of 4th metatarsal

68
Q

second plantar interosseous: insertion

A

medial base of 4th proximal phalanx

69
Q

third plantar interosseous: origin

A

inferior surface of base, medial surface of shaft of 5th metatarsal

70
Q

third plantar interosseous: insertion

A

medial base of 5th proximal phalanx

71
Q

first dorsal interosseous: origin

A

adjacent sides of shafts of 1st and 2nd mets

72
Q

first dorsal interosseous: insertion

A

medial base of 2nd proximal phalanx, extensor hood of 2nd digit

73
Q

second dorsal interosseous: origin

A

adjacent sides of shafts of 2nd, 3rd metatarsals

74
Q

second dorsal interosseous: insertion

A
  • lateral base of second proximal phalanx
  • extensor hood of second digit
75
Q

third dorsal interosseous: origin

A

adjacent sides of shafts of third, fourth metatarsals

76
Q

third dorsal interosseous: insertion

A
  • lateral side of base of third proximal phalax
  • extensor hood of third digit
77
Q

fourth dorsal interosseous: origin

A

adjacent sides of shafts of 4th, 5th metatarsals

78
Q

fourth dorsal interosseous: insertion

A
  • lateral side of base of fourth proximal phalanx
  • extensor hood of 4th digit
79
Q

superior extensor retinaculum: attachments, encloses

A

aka transverse crural retinaculum
- attaches distal, anterior aspect of fibula and tibia
- encloses peroneus tertius, extensor digitorum longus, extensor hallucis longus, tibialis anterior

80
Q

inferior extensor retinaculum: stem attachments, encloses

A
  • stem attaches calcaneal portion of sinus tarsi
  • encloses common tendon sheath of peroneus tertius, extensor digitorum longus
81
Q

inferior extensor retinaculum: superior limb attaches, encloses

A
  • attaches medial malleolus
  • encloses tibialis anterior, extensor hallucis longus
82
Q

inferior extensor retinaculum: inferior portion attaches, encloses

A
  • attaches plantar aponeurosis
  • continuous w/ inferior peroneal retinaculum
  • encloses tibialis anterior, extensor hallucis longus
83
Q

superior portion of peroneal retinaculum: attachments

A
  • lateral malleolus
  • lateral surface of calcaneus
84
Q

inferior portion of peroneal retinaculum: attaches

A
  • fibular trochlea of calcaneus
  • continuous w/ inferior extensor retinaculum

LEA (3 decks)

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