Foot Muscles Flashcards
Extensor Digitorum Brevis
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
Extensor Hallucis Brevis
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
Abductor Hallucis
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
Flexor Digitorum Brevis
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
Abductor Digiti Minimi
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
Quadratus Plantae
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
Lumbricals
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
Flexor Hallucis Brevis
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
Adductor Hallucis
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
Flexor Digiti Minimi Brevis
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
Plantar Interossei
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
Dorsal Interossei
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