Muscles of the leg Flashcards
Gastrocnemius
Ori:
1.)Medial head:
Medial condyle of femur
2.)Lateral head:
Lateral condyle of femur
Ins:
1.) Calcaneus via calcaneal (Achilles)tendon
Fun: (2)
1.) Plantar flex. of foot (ankle J.)
2.) Flex. of leg (knee J.)
N: Tibial
(super. post. comp)
Solleus
Ori:
1.) Soleal line of tibia.
2.) Head of the fibula
3.) Proximal posterior surface of body of fibula
Ins:
1.) Calcaneus via calcaneal (Achilles)tendon
Fun: (1)
Plantar flexion of the foot (ankle J.)
N: Tibial
(super. post comp)
Plantaris
FUN FACT***
Ori:
1.) Lower part of the lateral supracondylar ridge of femur.
Ins:
1.)Calcaneus via calcaneal (Achilles)tendon
Fun: (2)
1.) Plantar flex. of foot (ankle J.)
2.) Flex. of leg (Knee J.)
N: Tibial
(super. post. comp.)
** Has a long tendon and can be removed and gratfed **
Flexor hallucis longus
Ori:
1.) Inferior 2/3 of posterior surface of fibula and interosseous membrane.
Ins:
1.) Distal phalanx of big toe
Fun:
1.) Flex. of big toe @ MTP & IP joints.
2.) Plantar flexion of foot @ the ankle J.
3.) Inversion of foot @ the subtalar J.
N: tibial
(deep post. comp)
(CROSS: lat bone to medial)
Flexor digitorum longus
Ori:
1.) middle 1/3 of tibia
Ins:
2.) Base of distal phalanges of toes 2-5
Fun:
1.) Flex. of toes #2-5 @ MTP and PIP & DIP joints.
2.) Plantar flexion of foot @ ankle J.
3.) Inversion of foot @ subtalar J.
N: Tibial
(deep post. comp.)
(CROSS: med. bone to lateral bones)
Tibialis posterior
Ori:
1.) Proximal of posterior surface of tibia, fibula and interosseous membrane
Ins:
1.) 2nd & 3rd & 4th metatarsals
2.) Navicular
3.) All three cuneiforms
4.) Cuboid
5.) Calcaneus
(ALL TARSALS AND MTs except talus and 1st/5th metatarsals)
Fun:
1.) Plantar Flex. of foot @ ankle J.
2.) Inversion of foot @ subtalar J.
N: tibial
(deep. post. comp)
(CROSS: between EDL and FHL connects to both tib and fib to center metatarsals)
Popliteus
Ori:
1.) Lateral surface of lateral condyle of femur
Ins:
1.) above the soleal line on the posterior
Fun:
1.) Flex. of leg @ the knee J.
2.) Med. Rot. of leg @ knee J. (to UNLOCK the extended knee)
N: tibial
(deep post. comp.)
POPLITEUS IS THE KEY TO UNLOCK THE KNEE
Tibialis anterior
Ori:
1.) lateral condyle and upper 2/3 of lateral surface of tibia; and interosseous membrane.
Ins:
1.) 1st (medial) cuneiform
2.) Base of the 1st metatarsal
Fun:
1.) Dorsiflexion of foot @ ankle J. (prime mover of DF)
2.) Inversion of foot @ subtalar J.
N: Deep fibular (peroneal)
Extensor hallucis longus
Ori:
middle 1/3 of anterior surface of fibula and interosseous membrane.
Ins:
Base of distal phalanx of big toe
Fun:
1.) Ext. of big toe @ MTP and IP joints
2.) Dorsiflexion of foot @ ankle J.
3.) Inversion of foot @ subtalar J.
N: Deep fibular (peroneal)
Extensor digitorum
Ori:
1.) lateral condyle of tibia
2.) Proximal 2/3 of anterior surface of fibula
interosseous membrane.
Ins:
1.) Middle and distal phalanges of toes 2-5 (Via dorsal digital expansion)
Fun:
1.) Ext. of toes # 2-5 @ MTP and IP joints
2.) Dorsiflexion of foot @ ankle J.
3.) Eversion of foot @ subtalar J.
N: Deep fibular (peroneal)
Fibularis (peroneus) tertius
Ori:
1.) Distal 1/3 of anterior surface of fibula and interosseous membrane
Ins:
1.) Base of the 5th metatarsal
Fun:
1.) Dorsiflexion of foot @ ankle J.
2.) Eversion of foot @ subtalar J.
N: Deep fibular (peroneal)
Fibularis (peroneus) longus
Ori:
1.) Head of fibula
2.) Proximal 1\2 of lateral surface of fibula.
Ins:
1.) Base of the 1st metatarsal
2.) 1st cuneiform
(Same as tibialis anterior)
Fun: (2)
1.) Eversion of foot @ subtalar J.
2.) Plantar flexion of foot @ ankle J.
N: superficial fibular (peroneal)
Fibularis (peroneus) brevis
Ori:
1.) Distal 1/2 of lateral surface of fibula
Ins:
1.) Tuberosity of the 5th metatarsal bone
Fun: (2)
1.) Eversion of foot @ subtalar J.
2.) Plantar flexion of foot @ ankle J.
N: superficial fibular (peroneal)
What are the 3 compartments of the leg? Functions? Nerve?
Anterior- dorsi flexion, extension of toes, inversion and eversion (deep fibular nerve)
Lateral- eversion and plantar flexion (superficial fibular nerve)
posterior- plantar flexion, flexion of toes, plantar flexion and inversion (tibial nerve)
Anterior compartment muscles of leg? Vasculature? Nerve?
Extensors:
1.) tibialis anterior
2.) extensor digitorum longus
3.) extensor hallucis longus
4.) fibularis (peroneus) tertius
Ant. tibial artery and veins
deep fibular (peroneal) nerve
