CHA 101L - Lab 17 (3 out of 3)

Anterior compartment of the leg innervation and supply

Deep fibular nerve

Anterior tibial artery

Muscles of the anterior compartment of the leg

Tibialis anterior

Extensor hallucis longus

Extensor digitorum longus

Tibialis anterior

Origin: Lateral condyle and lateral surface of the tibia

Insertion: Base of first metatarsal

Main action of the tibialis anterior

Dorsiflexes ankle

Inverts foot

Extensor hallucis longus

Origin: Anterior fibula and interosseous membrane

Insertion: Dorsal aspect of distal phalanx of great toe

Main action of Extensor hallucis longus

Extends great toe

Dorsiflexes ankle

Extensor digitorum longus

Origin: Lateral tibial condyle, medial surface of fibula, interosseous membrane

Insertion: Middle and distal phalanges of digits 2-5

Main action of Extensor digitorum longus

Extends digits 2-5

Dorsiflexes ankle

What are shin splints?

Micro-fractures on the tibia tuberosity

Lateral compartment of the leg innervation and supply

Superior fibular nerve

Perforating branches of the fibular arterty

Lateral compartment of the leg

Fibularis longus

Fibularis brevis

Fibularis longus

Origin: Head and superolateral fibula

Insertion: Base of the first metatarsal

Main action of the fibularis longus

Everts foot

Plantarflexes foot

Fibularis brevis

Origin: Inferolateral fibula

Insertion: Base of the 5th metatarsal

Main action of the fibularis brevis

Everts foot

Plantarflexes foot

Posterior compartment of the leg innervation and supply

Tibial nerve

Posterior tibial artery

Posterior compartment of the leg - Superficial layer

Gastrocnemius

Soleus

Plantaris

Gastrocnemius

Origin: Lateral and medial femoral condyles

Insertion: Calcaneal tendon (Achilles heel)

Main action of gastrocnemius

Plantarflexes ankle

Flexes leg

Soleus

Origin: Posterior fibular head, tibial soleal line

Insertion: Calcaneal tendon (Achilles heel)

Main action of the soleus

Plantarflexes ankle

Plantaris

Origin: Lateral supracondylar line

Insertion: Calcaneal tendon (Achilles heel)

Main action of the plantaris

Weakly assists gastrocnemius

Posterior compartment of the leg - Deep layer

Flexor hallucis longus

Flexor digitorum longus

Tibialis posterior

Flexor hallucis longus

Origin: Posterior fibula, interosseous membrane

Insertion: Bases of the distal phalanx of the great toe

Main action of flexor hallucis longus

Flexes the great toe

Plantarflexes ankle

Flexor digitorum longus

Origin: Posterior tibia and fibula

Insertion: Distal phalanges 2-5

Main action of flexor digitorum longus

Flexes digit 2-5

Plantarflexes ankle

Tibialis posterior

Origin: Interosseous membrane, posterior surface of tibia and fibula

Insertion: Navicular, cuneiform, cuboid, bases of metatarsals 2-4

Main action of tibialis posterior

Plantarflexes ankle

Inverts foot

Plantar compartment of the foot are innervated by the...

Terminal branches of the tibial nerve (medial plantar nerve and lateral plantar nerve)

Deep to the plantar aponeurosis, the plantar compartment is divided into ___ layers

4

Plantar compartment - 1st Layer

ABductor hallucis

Flexor digitorum brevis

ABductor digiti minimi

ABductor hallucis

Origin: Calcaneus, plantar aponeurosis

Insertion: Medial base of proximal phalanx of great toe

Main action and innervation of ABductor hallucis

ABducts and flexes great toe

Medial plantar nerve

Flexor digitorum brevis

Origin: Calcaneus, plantar aponeurosis

Insertion: Both sides of middle phalanx digits 2-5

Main action and innervation of Flexor digitorum brevis

Flexes digits 2-5

Medial plantar nerve

ABductor digiti minimi

Origin: Calcaneus, plantar aponeurosis

Insertion: Lateral proximal phalanx of digit 5

Main action and innervation of ABductor digiti minimi

ABducts digit 5

Lateral plantar nerve

Planar compartment - 2nd layer

Quadratus plantae

Lumbricals

Quadratus plantae

Origin: Calcaneus

Insertion: Flexor digitorum longus tendon

Main action and innervation of quadratus plantae

Assist FDL, flexes digits 2-5

Lateral plantar nerved

Lumbricals of the foot

Origin: Flexor digtorum longus tendon

Insertion: Medial aspect of extensor expansion of digits 2-5

Main action and innervation of lumbricals

Flexes MP joints 2-5, extends IP joints 2-5

Medial plantar (1) and lateral plantar (2-5) nerve

Plantar compartment - 3rd layer

Flexor hallucis

ADductor hallucis

Flexor digit minimi

Flexor hallucis brevis

Origin: Cuboid, lateral cuneiforms

Insertion: Both sides of the base of great toe proximal phalanx

Main action and innervation of flexor hallucis brevis

Flexes great toe

Medial plantar nerve

The 4th layer of the plantar compartment contain...

3 plantar and 4 dorsal interossei muscles

Innervated by the lateral plantar nerve

Main action and innervation of ADductor hallucis

ADducts great toe

Lateral plantar nerve

ADductor hallucis

Origin: Base of metatarsals 2-4

Insertion: Proximal phalanx of great toe

Main action and innervation of Adductor hallucis

Flexes digit 5

Lateral plantar nerve

Main action and innervation of flexor digits minimi

Flexes digit 5

Lateral plantar n

Flexor digiti minimi (brevis)

Origin: 5th metatarsal

Insertion: Proximal phalanx of digit 5

Tom, Dick, And Nervous Harry refers to...

Tibialis posterior

flexor Digitorum longus

posterior tibial Artery

tibial Nerve

flexor Hallucis longus