Muscles of Joel's Lower Limb

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)


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)


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



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,



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)


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)


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)


8/23

Soleus

Posterior Leg Superficial Muscles

Origin: Superior posterior medial suface of Tibia, superior posterior of FibulaInsertion: Calcaneus via calcaneal tendon

Action: Plantarflexion



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)


10/23

Tibialis Posterior


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)


11/23

Flexor Hallucis Longus


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,



12/23

Flexor Digitorum Longus


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



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)


14/23

Abductor Hallucis

Ventral Foot First Layer (Most Superficial)

\

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)


15/23

Flexor Digitorum Brevis


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)


16/23

Abductor Digiti Minimi


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)


17/23

Quadratus Plantae

Ventral Foot Second Layer

Origin: Medial surface of calcanealInsertion: Lateral to FDL tendon

Action: Assists flexion of lateral toes


(S1-S3)


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)


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)


20/23

Adductor Hallucis


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


(S2-S3)


21/23

Flexor Digiti Minimi Brevis


Origin: Base of 5th metatarsal

Insertion: Lateral side of base of proximal phalanx of 5th toe

Action: Flexes 5th toe at MTP joint


(S2-S3)


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


(S2-S3)


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


(S2-S3)

Muscles of Joel's Lower Limb

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