Anterior and Lateral Leg Flashcards
What does the tibia articulate with?
Femur and the Talus
Which of the leg bones is weight bearing?
The tibia
Fibula is for muscle attachments
What does the fibula articulate with inferiorly?
Talus
Name the 3 compartments of the leg, separated by crural (sp?) fascia
Anterior, Lateral, Posterior
The deep fascia in the leg is important in preventing swelling of the leg muscles by promoting venous (blood) return, which helps to form the…
Calf pump
The compartment of the leg that is the dorsi flexor/extensor
Anterior
What innervates the anterior compartment of the leg?
Deep Fibular/Peroneal Nerve
Name the 4 muscles of the anterior compartment of the leg
Tibialis Anterior
Extensor Digitorum Longus
Fibularis/Peroneus Tertius
Extensor Hallucis Longus
The muscle that is just lateral to the tibia and has a strong tendon located lateral to the medial malleolous, and is the strongest dorsiflexor and invertor of the foot
Tibialis Anterior
Origin and Insertion of the tibialis anterior
Origin: Lateral condyle, interosseous membrane
Insertion: Medial cuneiform and 1st metatarsal
Innervation of the tibialis anterior
Deep Fibular Nerve, branch of the sciatic nerve
Actions of the tibialis anterior
Dorsiflexion and inversion of the foot
The most laterally placed muscle in the anterior compartment of the leg, divides into 4 tendons
Extensor Digitorum Longus
Origin and Insertion of the extensor digitorum longus
Origin: Lateral condyle of the tibia, Fibula, Interosseous membrane
Insertion: Phalanges of toes 2,3,4,5 via extensor expansion hood
Innervation of the extensor digitorum longus
Deep Fibular Nerve
Action of the extensor digitorum longus
Extend the toes, dorsiflexion, and eversion of the foot
The muscle that is fused with the extensor digitorum longus. Just above the ankle joint a small portion of the muscle gives rise to a tendon which inserts on the dorsum of the foot, not the toes
Fibularis Tertius
Origin and insertion of the fibularis tertius
Origin: Distal part of fibula, interosseeous membrane
Insertion: Dorsum of 5th metatarsal
Action of the fibularis tertius
Deep fibular Nerve
Action of the fibularis tertius
Dorsiflexion and eversion
The muscle deeply placed between the tibialis anterior and the extensor digitorum longus.
What does hallux mean?
Extensor Hallucis Longus
Great Toe
Origin and insertion of the extensor hallucis longus
Origin: Fibula, Interosseous membrane
Insertion: Distal phalynx of the great toe
Innervation of the extensor hallucis longus
Deep Fibular Nerve
Action of the extensor hallucis longus
Extends big toe and helps with dorsiflexion of the foot
The thick band of fibers holding the tendons on the anterior side of the ankle
Superior and inferior extensor retinacula
Edema and pain the the area of the distal 2/3 of the tibia.
Anterior tibialis strain results from micro tears in the periosteum of the tibia, results from injury or athletic overuse of the muscle in the anterior compartment
Shin Splints
Results from injury to the deep fibular/peroneal nerve, the foot cannot be dorsiflexed
Foot Drop from Shin slins
What do the muscles of the lateral compartment do?
Plantar flexion and eversion
What innervates the lateral compartment of the leg?
Superficial fibular/peroneal nerve
Name the two muscle of the lateral compartment of the leg
Fibularis Longus
Fibularis Brevis
The superficial lateral compartment muscle
Fibularus Longus
Origin and insertion of the fibularis longus
Origin: Fibula, more superiorly than brevis
Insertion: 1st metatarsal and medial cuneiform
Innervation of the fibularis longus
Superficial fibular nerve
Action of the fibularis longus
Plantar flexion, eversion, support arches of the foot
The lateral compartment muscle that lies deep
Fibularis Brevis
Origin and insertion of the fibularis brevis
Origin: fibula, distal to longus insertion
Insertion: 5th metatarsal tuberosity
Innervation of the fibularis brevis
Superficial fibular nerve
Action of the fibularis brevis
Plantar flexion and eversion
Fibrous bands holding the peroneal/fibular tendons behind the lateral malleolus
Peroneal Retinacula