O's and I's Foot Intrinsics Flashcards
Abductor Hallucis Origin
- Medial process of Calcaneus
2. Plantar Aponeurosis
Abductor Hallucis Insertion
Medial side of base of proximal phalanx of big toe
Abductor Hallucis Action
- Abducts big toe
2. Assists in flexing Hallux
Abductor Hallucis Nerve
Medial Plantar
Flexor Digitorum Brevis Origin
- Anterior aspect of medial process of Calcaneus
2. Plantar Aponeurosis
Flexor Digitorum Brevis Insertion
Splits to attach on both sides of the middle phalanx of toes 2-5
Flexor Digitorum Brevis Action
Flexes toes 2-5
Flexor Digitorum Brevis Nerve
Medial Plantar
Abductor Digiti Minimi Origin
- Lateral process of Calcaneus
2. Plantar Aponeurosis
Abductor Digiti Minimi Insertion
Lateral side of the base of the proximal phalanx of the 5th toe
Abductor Digiti Minimi Action
Abducts and flexes 5th toe
Abductor Digiti Minimi Nerve
Lateral Plantar
Quadratus Plantae Origin
- Medial Head: Medial Calcaneus
2. Lateral Head: Lateral Calcaneus and long plantar ligament
Quadratus Plantae Insertion
Lateral edge of tendon of Flexor Digitorum Longus
Quadratus Plantae Action
Aids to flex toes 2-5 by offsetting the oblique pull of the Flexor Digitorum Longus
Quadratus Plantae Nerve
Lateral Plantar
Lumbricales Origin
From the tendon of the Flexor Digitorum Longus (4 Muscles)
Lumbricales Insertion
Onto tendons of Extensor Digitorum Longus
Lumbricales Action
- Flexes proximal phalanx at MTP joint
2. Extends middle and distal phalanges at IP joints
Lumbricales Nerve
1st- Medial Plantar
2nd-4th- Lateral Plantar
Flexor Hallucis Brevis Origin
Medial aspect of Cuboid
Flexor Hallucis Brevis Insertion
Base of proximal phalanx of Hallux
Flexor Hallucis Brevis Action
Flexes big toe
Flexor Hallucis Brevis Nerve
Medial Plantar
Adductor Hallucis Origin
- Oblique Head: Base of 2nd-4th Metatarsals and Long Plantar Ligament
- Transverse Head: Transverse Metatarsal Ligament and Plantar ligaments at MTP joint
Adductor Hallucis Insertion
Lateral aspect of the base of the proximal phalanx of Hallux
Adductor Hallucis Action
- Adducts big toe
2. Flexes big toe
Adductor Hallucis Nerve
Lateral Plantar
Flexor Digiti Minimi Brevis Origin
Base of 5th Metatarsal
Flexor Digiti Minimi Brevis Insertion
Lateral aspect of the base of the proximal phalanx of the 5th ray
Flexor Digiti Minimi Brevis Action
Flexes 5th toe
Flexor Digiti Minimi Brevis Nerve
Lateral Plantar
Plantar Interossei Origin
Medial aspect of 3rd-5th Metatarsals
Plantar Interossei Insertion
Medial aspect of base of proximal phalanx of the same ray (3rd-5th)
Plantar Interossei Action
- Adducts toes 3-5
2. Flexes toes 3-5
Plantar Interossei Nerve
Lateral Plantar
Dorsal Interossei Origin
From both metatarsals between which they lie
Dorsal Interossei Insertion
- Medial side of proximal phalanx of 2nd toe
- Lateral side of proximal phalanx of 2nd toe
- Lateral side of proximal phalanx of 3rd toe
- Lateral side of proximal phalanx of 4th toe
Dorsal Interossei Action
- Abducts toes 2-4
2. Flexes toes 2-4
Dorsal Interossei Nerve
Lateral Plantar
Extensor Hallucis Brevis Origin
Dorsal surface of Calcaneus
Extensor Hallucis Brevis Insertion
Base of proximal phalanx of hallux on dorsum
Extensor Hallucis Brevis Action
Extends big toe
Extensor Hallucis Brevis Nerve
Deep Peroneal
Extensor Digitorum Brevis Origin
Dorsal surface of anterolateral calcaneus
Extensor Digitorum Brevis Insertion
Lateral side of tendons of Extensor Digitorum Longus for 2nd-4th toes
Extensor Digitorum Brevis Action
Extends 2nd-4th toes
Extensor Digitorum Brevis Nerve
Deep Peroneal
Gastrocnemius Origin
- Medial Head: Just above the Medial Condyle of Femur
2. Lateral Head: Lateral Condyle of Femur
Gastrocnemius Insertion
Calcaneus
Gastrocnemius Action
- Plantar Flexes Ankle
2. Flexes Knee
Gastrocnemius Nerve
Tibial
Soleus Origin
- Soleal Line of Tibia
2. Upper Fibula
Soleus Insertion
Calcaneus
Soleus Action
Plantar Flexes Ankle
Soleus Nerve
Tibial
Plantaris Origin
Lateral Femoral Condyle
Plantaris Insertion
Calcaneus
Plantaris Action
- Weakly Plantar Flexes Ankle
2. Weakly Flexes Knee
Plantaris Nerve
Tibial
Popliteus Origin
Lateral Femoral Epicondyle
Popliteus Insertion
Soleal Line
Popliteus Action
- Insertion fixed: Laterally rotates Femur on Tibia and unlocks (flexes) knee
- Origin fixed: Medially rotates Tibia on Femur and unlocks (flexes) knee
Popliteus Nerve
Tibial
Tibialis Posterior Origin
- Posterior Tibia
2. Interosseus Membrane
Tibialis Posterior Insertion
- Navicular Tuberosity
- Plantar surface of Cuneiforms and Cuboid
- Bases of 2nd-4th Metatarsals
Tibialis Posterior Action
- Inversion
- Horizontal Adduction
- Weakly Plantar Flexes Ankle
- Functionally: Resists Hyperpronation
Tibialis Posterior Nerve
Tibial
Flexor Digitorum Longus Origin
Posterior Surface of Tibia
Flexor Digitorum Longus Insertion
Plantar Surface of the bases of 2nd-5th Distal Phalanges
Flexor Digitorum Longus Action
- Primarily Flexes 2nd-5th Toes
- Weakly Plantar Flexes Ankle
- Weakly Inverts and Adducts Foot
Flexor Digitorum Longus Nerve
Tibial
Flexor Hallucis Longus Origin
- Posterior, Inferior 2/3 Fibula
2. Interosseus Membrane
Flexor Hallucis Longus Insertion
Plantar Surface of Distal Phalanx of Hallux
Flexor Hallucis Longus Action
- Flexes Hallux
- Weakly Plantar Flexes Ankle
- Weakly Inverts and Adducts Foot
Flexor Hallucis Longus Nerve
Tibial
Peroneus (Fibularis) Longus Origin
- Head of Fibula
2. Upper Half of Fibula
Peroneus (Fibularis) Longus Insertion
- Base of 1st Metatarsal
- 1st Cuneiform
- Base of 2nd Metatarsal
Peroneus (Fibularis) Longus Action
- Everts and Horizontally Abducts Foot
2. Weakly Plantar Flexes Foot
Peroneus (Fibularis) Longus Nerve
Superficial Fibular
Peroneus (Fibularis) Brevis Origin
Lower Half of Fibula
Peroneus (Fibularis) Brevis Insertion
Tuberosity on Lateral Aspect of Base of 5th Metatarsal
Peroneus (Fibularis) Brevis Action
- Everts and Horizontally Abducts Foot
2. Weakly Plantar Flexes Foot
Peroneus (Fibularis) Brevis Nerve
Superficial Fibular
Tibialis Anterior Origin
Lateral Tibial Condyle and Anterolateral Surface of Tibia
Tibialis Anterior Insertion
- Medial and Plantar Surface of Base of 1st Metatarsal
2. Medial and Plantar Surface of 1st Cuneiform
Tibialis Anterior Action
- Dorsiflexes Foot
2. Helps Invert and Horizontally Adduct Foot
Tibialis Anterior Nerve
Deep Fibular
Extensor Hallucis Longus Origin
- Medial Aspect of Fibula
2. Interosseus Membrane
Extensor Hallucis Longus Insertion
Dorsal Surface of Base of Proximal and Distal Phalanx of Hallux
Extensor Hallucis Longus Action
- Extends Distal Phalanx of Big Toe
- Weakly Dorsiflexes Foot
- Weakly Inverts and Adducts Foot
Extensor Hallucis Longus Nerve
Deep Fibular
Extensor Digitorum Longus Origin
- Upper Anterior Surface of Fibula
2. Interosseus Membrane
Extensor Digitorum Longus Insertion
Dorsal Surface of the Bases of the Middle and Distal Phalanxes of the 2nd-5th Rays
Extensor Digitorum Longus Action
- Extends Lateral 4 Toes
2. Weakly Dorsiflexes and Everts Foot
Extensor Digitorum Longus Nerve
Deep Fibular
Peroneus Tertius Origin
Distal 1/3 of Anterior Fibula
Peroneus Tertius Insertion
Dorsal Surface of the Base of the 5th Metatarsal
Peroneus Tertius Action
Weakly Dorsiflexes and Everts Foot
Peroneus Tertius Nerve
Deep Fibular