PT ANAT - Lower Quarter - Sole of Foot

Abductor Hallucis - Origin - 1st Layer

Medial tubercle of tuberosity of calcaneus; flexor retinaculum; plantar aponeurosis

Abductor Hallucis - Insertion - 1st Layer

Medial side of base of proximal phalanx of 1st digit

Abductor Hallucis - Peripheral Innervation - 1st Layer

Medial plantar nerve

Abductor Hallucis - Segmental Innervation - 1st Layer

L5, S1

Abductor Hallucis - Action - 1st Layer

Great toe abduction and flexion (at 1st MTP joint)

Abductor Digiti Minimi - Origin - 1st Layer

Medial and lateral tubercles of tuberosity of calcaneus; plantar aponeurosis

Abductor Digiti Minimi - Insertion - 1st Layer

Lateral side of base of proximal phalanx of 5th digit

Abductor Digiti Minimi - Peripheral Innervation - 1st Layer

Lateral plantar nerve

Abductor Digiti Minimi - Segmental Innervation - 1st Layer

S1-S3

Abductor Digiti Minimi - Action - 1st Layer

5th digit abduction and flexion (at 5th MTP joint)

Flexor Digitorum Brevis - Origin - 1st Layer

Medial tubercle of tuberosity of calcaneus; plantar aponeurosis

Flexor Digitorum Brevis - Insertion - 1st Layer

Both sides of middle phalanges of digits 2-5

Flexor Digitorum Brevis - Peripheral Innervation - 1st Layer

Medial plantar nerve

Flexor Digitorum Brevis - Action - 1st Layer

Flexes digits 2-5 at MTP and PIP joints

Quadratus Plantae - Origin - 2nd Layer

Medial surface and lateral margin of plantar surface of calcaneus

Quadratus Plantae - Insertion - 2nd Layer

Tendon of flexor digitorum longus

Quadratus Plantae - Peripheral Innervation - 2nd Layer

Lateral plantar nerve

Quadratus Plantae - Action - 2nd Layer

Assists flexor digitorum longus in flexing digits 2-5 at MTP, PIP, and DIP joints

Lumbricals - Origin - 2nd Layer

Tendons of flexor digitorum longus

Lumbricals - Insertion - 2nd Layer

Medial aspect of expansion over digits 2-5

Lumbricals - Peripheral Innervation - 2nd Layer

1st lumbrical: medial plantar nerve; 2nd-4th lumbricals: lateral plantar nerve

Lumbricals - Action - 2nd Layer

Flex MTP joints 2-5; extend PIP and DIP joints 2-5

Flexor Hallucis Brevis - Origin - 3rd Layer

Plantar surfaces of cuboid and lateral cuneiform

Flexor Hallucis Brevis - Insertion - 3rd Layer

Both sides of base of proximal phalanx of 1st digit

Flexor Hallucis Brevis - Peripheral Innervation - 3rd Layer

Medial plantar nerve

Flexor Hallucis Brevis - Action - 3rd Layer

1st MTP joint flexion

Adductor Hallucis (Oblique and Transverse Heads) - Origin - 3rd Layer

Oblique: bases of metatarsals 2-4; Transverse: plantar ligaments of metatarsophalangeal (MTP) joints

Adductor Hallucis (Oblique and Transverse Heads) - Insertion - 3rd Layer

Tendons of both heads attach to lateral side of base of proximal phalanx of 1st digit

Adductor Hallucis (Oblique and Transverse Heads) - Peripheral Innervation - 3rd Layer

Deep branch of lateral plantar nerve

Adductor Hallucis (Oblique and Transverse Heads) - Action - 3rd Layer

Adducts 1st MTP joint; helps maintain transverse arch of foot

Flexor Digiti Minimi Brevis - Origin - 3rd Layer

Base of 5th metatarsal

Flexor Digiti Minimi Brevis - Insertion - 3rd Layer

Base of proximal phalanx of 5th digit

Flexor Digiti Minimi Brevis - Peripheral Innervation - 3rd Layer

Superficial branch of lateral plantar nerve

Flexor Digiti Minimi Brevis - Action - 3rd Layer

5th MTP flexion

Plantar Interossei (Three) - Origin - 4th Layer

Plantar aspect of medial sides of shafts of metatarsals 3-5

Plantar Interossei (Three) - Insertion - 4th Layer

Medial sides of bases of proximal phalanges of 3rd-5th digits

Plantar Interossei (Three) - Peripheral Innervation - 4th Layer

Lateral plantar nerve

Plantar Interossei (Three) - Action - 4th Layer

Adducts MTP joints 3-5; flexes MTP joints 3-5

Dorsal Interossei (Four) - Origin - 4th Layer

Adjacent sides of shafts of metatarsals 1-5

Dorsal Interossei (Four) - Insertion - 4th Layer

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

Dorsal Interossei (Four) - Peripheral Innervation - 4th Layer

Lateral plantar nerve

Dorsal Interossei (Four) - Segmental Innervation - 4th Layer

S1-S3

Dorsal Interossei (Four) - Action - 4th Layer

Abducts MTP joints 2-4; flexes MTP joints 2-4