Download - Muscles of Joel's Lower Limb
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8/3/2019 Muscles of Joel's Lower Limb
1/23
Muscles:
Tibialis Anterior
- Anterior Leg Superficial Layer
Origin: Lateral condyle & superolateral shaft of Tibia, Interosseus Membrane
Insertion: Medial/inferior surface of medial cuniform, base of 1st metatarsal
Action: Dorsiflexion, inversion of foot,
Medial arch supportInnervation: Deep Fibular (L4-L5)
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8/3/2019 Muscles of Joel's Lower Limb
2/23
Extensor Digitorum Longus
Anterior Leg Superficial Layer
Origin: Lateral Tibial condyle, Superior medial aspect of fibula, Interosseus Membrane
Insertion: Middle and Distal phalanges (2nd
-5th
digits)Action: Dorsiflexion, extension of digits 2-5
Innervation: Deep Fibular (L5-S1)
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8/3/2019 Muscles of Joel's Lower Limb
3/23
Extensor Hallucis Longus
Anterior Leg Superficial Layer
Origin: Anterior surface of Fibula, Interosseus Membrane
Insertion: Dorsal surface on the base of distal phalanx of Hallux
Action: Dorsiflexion, extension of Hallux
Innervation: Deep Fibular (L5-S1)
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8/3/2019 Muscles of Joel's Lower Limb
4/23
Peroneus Tertius
Anterior Leg Deep Layer
Origin: Inferior 1/3 of anterior Fibular, Interosseus Membrane
Insertion: Dorsomedial surface of base of 5
th
metatarsalAction: Dorsiflexion, Eversion of foot,
Innervation: Deep Fibular (L5-S1)
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8/3/2019 Muscles of Joel's Lower Limb
5/23
Peroneus Longus
Lateral Leg
Origin: Head and superior lateral surface of Fibula
Insertion: Base of 1st metatarsal, Medial cuneiform
Action: Foot Eversion, Weak plantar flexion,
Arch support
Innervation: Superficial Fibular (L5-S2)
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8/3/2019 Muscles of Joel's Lower Limb
6/23
Peroneus Brevis
Lateral Leg
Origin: Inferior 2/3rds, lateral surface of fibula
Insertion: Tuberosity on base of 5th metatarsal
Action: Foot Eversion, weak plantar flexion
Innervation: Superficial Fibular (L5-S2)
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8/3/2019 Muscles of Joel's Lower Limb
7/23
Gastrocnemius
Posterior Leg Superficial Muscles
Origin: Lateral Head- Lateral Femoral Condyle
Medial Head- Medial Femoral Condyle
Insertion: Calcaneus via calcaneal tendon
Action: Plantarflexion
Knee Flexion
Innervation: Tibial (S1-S2)
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8/3/2019 Muscles of Joel's Lower Limb
8/23
Soleus
Posterior Leg Superficial Muscles
Origin: Superior posterior medial suface of Tibia, superior posterior of FibulaInsertion: Calcaneus via calcaneal tendon
Action: Plantarflexion
Innervation: Tibial (S1-S2)
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8/3/2019 Muscles of Joel's Lower Limb
9/23
Popliteus
Posterior Leg Deep Muscles
Origin: Lateral condyle of femur, lateral meniscus
Insertion: Posterior proximal shaft of TibiaAction: Knee flexion,
Medial rotation of Tibia
Innervation: Tibial (L4-S1)
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8/3/2019 Muscles of Joel's Lower Limb
10/23
Tibialis Posterior
Posterior Leg Deep Muscles
Origin: Interosseus Membrane, posterior tibia inferior to soleal line, posterior fibular
Insertion: Tuberosity of navicular, cuniforms, base of 2nd-4th metatarsals
Action: Plantarflexion,
Inversion of foot,
Medial arch support
Innervation: Tibial (L4-L5)
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8/3/2019 Muscles of Joel's Lower Limb
11/23
Flexor Hallucis Longus
Posterior Leg Deep Muscles
Origin: Inferior 2/3rds of posterior fibula, inferior Interosseus Membrane
Insertion: Plantar surface of base of distal phalanx of hallux
Action: Flexes hallux,
Weak plantarflexion,
Innervation: Tibial (S2-S3)
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8/3/2019 Muscles of Joel's Lower Limb
12/23
Flexor Digitorum Longus
Posterior Leg Deep Muscles
Origin: Medial posterior tibia inferior to
soleal lineInsertion: Plantar surface of bases of distal phalanges of lateral 4 digits
Action: Flexes lateral 4 toes,
Plantarflexion
Innervation: Tibial (S2-S3)
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8/3/2019 Muscles of Joel's Lower Limb
13/23
Extensor Digitorum Brevis
Dorsal Foot
Origin: Superolateral surface of the calcaneus
Insertion: Proximal phalanx of great toe, lateral sides of extensor digitorum longus
Action: Extension of MTP joint of hallux, extends toes 2-5
Innervation: Deep Fibular (S1-S2)
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8/3/2019 Muscles of Joel's Lower Limb
14/23
Abductor Hallucis
Ventral Foot First Layer (Most Superficial)
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Origin: Medial process of calcaneal tendon
Insertion: Medial side of base of proximal phalanx of great toe
Action: Abducts and flexes great toe at MTP joint
Innervation: Medial Plantar (S1-S3)
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8/3/2019 Muscles of Joel's Lower Limb
15/23
Flexor Digitorum Brevis
Ventral Foot First Layer (Most Superficial)
Origin: Medial process of calcaneal tendon
Insertion: Plantar surface of base of middle phalanges of lateral toes
Action: Flexes lateral toes at PIP joint
Innervation: Medial Plantar (S1-S3)
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8/3/2019 Muscles of Joel's Lower Limb
16/23
Abductor Digiti Minimi
Ventral Foot First Layer (Most Superficial)
Origin: Lateral & medial process of Calcaneal tuberosity
Insertion: Lateral side of base of proximal phalanx of 5th toe
Action: Abducts little toe at MTP joint
Innervation: Lateral Plantar
(S1-S3)
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8/3/2019 Muscles of Joel's Lower Limb
17/23
Quadratus Plantae
Ventral Foot Second Layer
Origin: Medial surface of calcanealInsertion: Lateral to FDL tendon
Action: Assists flexion of lateral toes
Innervation: Lateral Plantar
(S1-S3)
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8/3/2019 Muscles of Joel's Lower Limb
18/23
Lumbicals
Ventral Foot Second Layer
Origin: 1st-Medial side of FDL tendon
2/3/4th- between adjacent FDL tendons
Insertion: Medial free margins of extensor hoods of toes 2-5
Action: Flexion at MTP, extension at interphalangeal joint
Innervation: 1st- Medial Plantar (S1-S3)
2/3/4th- Lateral Plantar (S2-S3)
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8/3/2019 Muscles of Joel's Lower Limb
19/23
Flexor Hallucis Brevis
Ventral Foot Third Layer
Origin: Plantar surface of cuboid and lat. cuneiform, Tibialis posterior tendon
Insertion: Lateral and medial sides of base of proximal phalanx of great toe
Action: Flexes MTP joint of great toe
Innervation: Medial Plantar
(S1-S2)
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8/3/2019 Muscles of Joel's Lower Limb
20/23
Adductor Hallucis
Ventral Foot Third Layer
Origin: Transverse Head- Ligs. of MTP joint of lateral 3 toes
Oblique Head- bases of metatarsals 2-4
Insertion: Lateral sides of base of proximal phalanx of great toe
Action: Adducts great toe at MTP joint
Innervation: Lateral Plantar
(S2-S3)
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8/3/2019 Muscles of Joel's Lower Limb
21/23
Flexor Digiti Minimi Brevis
Ventral Foot Third Layer
Origin: Base of 5th metatarsal
Insertion: Lateral side of base of proximal phalanx of 5th toe
Action: Flexes 5th toe at MTP joint
Innervation: Lateral Plantar
(S2-S3)
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8/3/2019 Muscles of Joel's Lower Limb
22/23
Ventral Foot Fourth Layer (Deepest)
Dorsal Interossei
Origin: Side of adjacent metatarsal
Insertion: Extensor hoods
Bases of proximal phalanges of lateral toes
Action: Abducts 2nd-4th toes at MTP joints
Innervation: Lateral Plantar
(S2-S3)
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8/3/2019 Muscles of Joel's Lower Limb
23/23
Plantar Interossei
Ventral Foot Fourth Layer (Deepest)
Origin: Medial side of metatarsals of toes 3-5
Insertion: Extensor hoods
Bases of proximal phalanges of lateral toesAction: Adducts 3rd-5th toes at MTP joint
Innervation: Lateral Plantar
(S2-S3)