Foot Muscles Flashcards

1
Q

Extensor Digitorum Brevis

A

O:
Anterior part of dorsal surface of calcaneus
Anterior and medial to lateral malleolus
Inferior extensor retinaculum

I:
Lateral 3 tendons attach to tendons of extensor digitorum longus to digits 2-4

A:
Extend toes 2-4 at MTP joint
Assist extensor digitorum longus

N:
Deep peroneal L5-S1

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2
Q

Extensor Hallucis Brevis

A

O:
Anterior part of dorsal surface of calcaneus
Anterior and medial to lateral malleolus
Inferior extensor retinaculum

I:
Medial tendon of 4 tendons to base of proximal phlanx of hallux

A:
Extend hallux at MTP joint
Assist extensor hallucis longus

N:
Deep peroneal n L5, S1

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3
Q

Abductor Hallucis

A

O:
Medial process of tuber calcaneus
Flexor retinaculum
Plantar aponeurosis

I:
Medial side of base of proximal phalanx of hallux

A:
Abducts and flexes hallux

N:
Medial plantar n S1, S2

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4
Q

Flexor Digitorum Brevis

A

O:
Medial process of tuber calcaneus
Plantar aponeurosis
Intermuscular septum

I:
Both sides of middle phalanx of lateral 4 digits

A:
Flexes lateral 4 digits (PIP)

N:
Medial plantar n S1, S2

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5
Q

Abductor Digiti Minimi

A

O:
Medial and lateral processes of tuber calcanei
Plantar aponeurosis
Intermuscular septum

I:
Lateral side of base of proximal phalanx of 5th digit

A:
Abducts and flexes 5th digit

N:
Lateral plantar n S2, S3

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6
Q

Quadratus Plantae

A

O:
Medial surface and lateral margin of plantar surface of calcaneus

I:
Posterolateral margin of tendon of flexor digitorum longus

A:
Assists FDL in flexing lateral 4 digits

N:
Lateral plantar n S2, S3

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7
Q

Lumbricals

A

O:
Tendons FDL

I:
Medial sides of bases of proximal phalanges of lateral 4 digits
Extensor expansions of tendons of extensor digitorum longus

A:
Flex proximal phalanges and extend middle and distal phalanges of lateral 4 digits

N:
Medial lumbrical–medial plantar n S2, S3
Lateral 3 lumbricals–lateral plantar n S2, S3

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8
Q

Flexor Hallucis Brevis

A

O:
Plantar surface of cuboid
Lateral cuneiform bones

I:
Both sides of base of proximal phalanx of hallux

A:
Flexes proximal phalanx of hallux

N:
Medial plantar n S1, S2

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9
Q

Adductor Hallucis

A

O:
Oblique head–bases of metatarsals 2-4
Transverse head–plantar ligaments of MTP joints

I:
Tendons of both heads attach to lateral side of base of proximal phalanx of hallux

A:
Adducts hallux
Assists in maintaining transverse arch

N:
Lateral plantar n S2, S3

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10
Q

Flexor Digiti Minimi Brevis

A

O:
Base of 5th metatarsal bone

I:
Base of proximal phalanx of 5th digit

A:
Flexes proximal phalanx of 5th digit

N:
Lateral plantar n S2, S3

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11
Q

Plantar Interossei

A

O:
Bases and medial sides of metatarsals bones 3-5

I:
Medial side of bases of proximal phalanges of digits 3-5

A:
Adducts digits 3-5
Flexes MTP joints

N:
Lateral plantar n S2, S3

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12
Q

Dorsal Interossei

A

O:
Adjacent sides of metatarsal bones 1-5

I:
1st–medial side of proximal phalanx of 2nd digit
2-4–lateral sides of digits 2-4

A:
Abducts digits (2-4)
Can adduct the already abducted 2nd toe
Abducts MTP joints

N:
Lateral plantar n S2, S3

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