Muscles of the Lower Extremity: Intinsic Muscles of the Foot Flashcards
Extensor Digitorum Brevis Proximal Attachment
Dorsolateral surface of the calcaneus
Extensor Digitorum Brevis Distal Attachment
Joins lateral sides of EDL tendons of toes 2-4
Extensor Digitorum Brevis Innervation
Deep fibular n. [L5,S1]
Extensor Digitorum Brevis Action
Extends MTP, PIP, & DIP joints of toes 2-4
Extensor Hallucis Brevis Proximal Attachment
Dorsal surface of the calcaneus
Extensor Hallucis Brevis Distal Attachment
Dorsal surface of the proximal phalanx of the great toe
Extensor Hallucis Brevis Innervation
Deep fibular n. [L5,S1]
Extensor Hallucis Brevis Action
Extends MTP joint of great toe
First Layer Muscles
Abductor Hallucis
Flexor Digitorum Brevis
Abductor Digiti Minimi
Abductor Hallucis Proximal Attachment
Medial tubercle of the calcaneus
Abductor Hallucis Distal Attachment
Medial side of the proximal phalanx of the great toe
Abductor Hallucis Innervation
Medial plantar n. [S2,S3]
Abductor Hallucis Action
Abducts MTP joint of great toe
Flexes MTP joint of great toe
Flexor Digitorum Brevis Proximal Attachment
Medial tubercle of the calcaneus
Flexor Digitorum Brevis Distal Attachment
Medial sides of the middle phalanx of digits II-V
Flexor Digitorum Brevis Innervation
Medial plantar n. [S2,S3]
Flexor Digitorum Brevis Action
Flexes MTP & PIP joints of lateral 4 toes
Abductor Digiti Minimi Proximal Attachment
Tuberosity of the calcaneus and plantar aponeurosis
Abductor Digiti Minimi Distal Attachment
Lateral side of proximal phalanx of digit V
Abductor Digiti Minimi Innervation
Lateral plantar n. [S2,S3]
Abductor Digiti Minimi Action
Abducts MTP joint of little toe
Flexes MTP joint of little toe
Second Layer Muscles
Quadratus Plantae
Lumbricals
Quadratus Plantae Proximal Attachment
Plantar aspect of the calcaneus
Quadratus Plantae Distal Attachment
Lateral margin of FDL tendons
Quadratus Plantae Innervation
Lateral plantar n. {S2,S3]
Quadratus Plantae Action
Assists FDL in flexing lateral 4 toes
Lumbricals Proximal Attachment
Tendons of the flexor digitorum longus muscle
Lumbricals Distal Attachment
Medial side of the proximal phalanx of digits II-V via the extensor hoods
Lumbricals Innervation
1st: Medial plantar n. [S2,S3]
2nd-4th: Lateral plantar n. [S2,S3]
Lumbricals Action
Flexes the MTP joints of the lateral 4 toes
Extends the PIP & DIP joints of lateral 4 toes
Third Layer Muscles
Flexor Hallucis Brevis
Adductor Hallucis
Flexor Digiti Minimi
Flexor Hallucis Brevis Proximal Attachment
Plantar surface of cuboid and lateral cuneiform
Flexor Hallucis Brevis Distal Attachment
Both sides of the proximal phalanx of the great toe
Flexor Hallucis Brevis Innervation
Medial plantar n. [S2,S3]
Flexor Hallucis Brevis Action
Flexes MTP joint of great toe
Adductor Hallucis Proximal Attachment
Oblique head: bases of metatarsals II-IV
Transverse head: from ligaments near the heads of metatarsals III-V
Adductor Hallucis Distal Attachment
Lateral side of the proximal phalanx of the great toe
Adductor Hallucis Innervation
Lateral plantar n. [S2,S3]
Adductor Hallucis Action
Adducts MTP joint of great toe
Flexes MTP joint of great toe
Flexor Digiti Minimi Proximal Attachment
Base of metatarsal V
Flexor Digiti Minimi Distal Attachment
Lateral side of the proximal phalanx of the little toe
Flexor Digiti Minimi Innervation
Lateral plantar n. [S2,S3]
Flexor Digiti Minimi Action
Flexes MTP joint of little toe
Fourth Layer Muscles
Dorsal Interossei
Plantar Interossei
Dorsal Interossei Proximal Attachment
Adjacent sides of 2 metatarsals
Dorsal Interossei Distal Attachment
1st: Medial side of proximal phalanx of digit II
2nd, 3rd, 4th: Lateral sides of proximal phalanx of digits II-IV
Dorsal Interossei Innervation
Lateral plantar n. [S2,S3]
Dorsal Interossei Action
Abducts MTP joints of toes 2-4
Flexes MTP joints of toes 2-4
Extends PIP & DIP joints of toes 2-4
Plantar Interossei Proximal Attachment
Medial sides of MT III-V
Plantar Interossei Distal Attachment
Medial sides of proximal phalanx of digits III-V
Plantar Interossei Innervation
Lateral plantar n. [S2,S3]
Plantar Interossei Action
Adducts MTP joints of toes 3-5
Flexes MTP joints of toes 3-5
Extends PIP & DIP joints of toes 3-5