Leg and ankle Flashcards
name the borders of tibia:
anterior, medial, interosseous borders
name surfaces of tibia:
lateral, medial and posterior surfaces
name the borders of fibula:
anterior, posterior, interosseous
name surfaces of fibula:
medial, lateral, posterior
most inferior projection of tibia:
medial malleolus
most inferior projection of fibula:
lateral malleolus
list main groups of bones in the foot:
- proximal group tarsals
- intermediate tarsal bone
- distal group of tarsals
- metatarsals
- phalanges
list bones of proximal group of tarsals:
- talus
- calcaneus
list bones of distal group of tarsals:
cuneiforms:
- medial
- intermediate
- lateral
cuboid
list bones of intermediate tarsals:
navicular
superior tibiofibular joint: classification
synovial plane
superior tibiofibular joint: articulating surfaces
- lateral condyle of tibia
- inferior surface w/ head of fibula
- superomedial surface
superior tibiofibular joint: ligaments
- anterior
- posterior ligs
superior tibiofibular joint: movements
very little
middle tibiofibular joint: features
- interosseous membrane
apertures for:
- anterior tibial vessels
- perforating branch of fibular artery
inferior tibiofibular joint: classification
fibrous joint, syndesmosis
inferior tibiofibular joint: articulating surfaces
distal part of fibula w/ fibular notch of tibia
inferior tibiofibular joint: ligaments
- anterior tibiofibular
- post tibiofibular
- interosseous tibiofibular ligs
inferior tibiofibular joint: movements
minimal:
- slight movement of bones away from each other during dorsiflexion
ankle joint: classification
synovial hinge
ankle joint: articulating surfaces
‘socket’ formed by:
- interior surface of tibia,
- medial malleolus of tibia,
- lateral malleolus of fibula
w/ articular surfaces of talus
ankle joint: ligaments
medially:
- deltoid lig
laterally
- anterior talofibular
- calcaneofibular
- posterior talofibular
ankle joint: movements
dorsiflexion
plantarflexion
ankle joint: stability
- most stable in dorsiflexion
- excess side to side movement limited by ligaments (deltoid very strong, ant talofibular the weakest)
name the compartments of the leg:
- post
- lateral
- ant
list the leg muscles: (3) superficial post com
- gastrocnemius
- soleus
- plantaris
list the leg muscles: (4) deep post com
- popliteus
- tibialis posterior
- flexor hallucis longus (FHL)
- flexor digitorum longus (FDL)
list the leg muscles: lateral com
- peroneus longus
- peroneus brevis
list the leg muscles: anterior com
- tibialis anterior
- extensor hallucis long (EHL)
- extensor digitorum longus (EDL)
- peroneus tertius (part of EDL)
gastrocnemius: location
post com of leg, superficial
gastrocnemius: origin
medial head:
- post surface of distal femur, superior to medial condyle
lateral head:
- post surface of lateral condyle
gastrocnemius: insertion
post surface of calcaneus (via calcaneal tendon)
gastrocnemius: innervation
tibial n
gastrocnemius: action
- plantarflexes foot (at ankle joint)
- flexes leg at knee joint
plantaris: location
post com of leg, superficial
plantaris: origin
- inferior part of lateral supracondylar line (femur)
- oblique popliteal ligament (knee)
plantaris: insertion
- post surface of calcaneus (via calcaneal tendon)
plantaris: innervation
tibial n
plantaris: action
- plantarflexes foot at ankle j
- flexes leg at knee
soleus: location
post com leg, deep to gastronemius
soleus: origin
- soleal line
- medial border of tibia
- post proximal fibula
- tendinous arch btw tibia and fibula
soleus: insertion
post surface of calcaneus (via calcaneal tendon)
soleus: innervation
tibial n
soleus: action
plantarflexes foot at ankle j
popliteus: location
post com leg, deep
popliteus: origin
lateral femoral condyle
popliteus: insertion
post surface of proximal tibia
popliteus: innervation
tibial n
popliteus: action
- stabilises knee joint
- unlocks knee (lateral rotation of femur)
- weak flexor of knee
flexor hallucis longus: location
post com leg, deep
flexor hallucis longus: origin
- post surface of fibula,
- interosseous membrane
flexor hallucis longus: insertion
distal phalanx of great toe (plantar surface)
flexor hallucis longus: innervation
tibial n
flexor hallucis longus: action
flexes great toe
flexor digitorum longus: location
post com leg, deep
flexor digitorum longus: origin
post surface of tibia (medial side)
flexor digitorum longus: insertion
bases of distal phalanx of lateral 4 toes (plantar surface)
flexor digitorum longus: innervation
tibial n
flexor digitorum longus: action
flexes lateral 4 toes
tibialis posterior: location
post com of leg, deep
tibialis posterior: origin
- post surface of interosseous membrane,
- adjacent surfaces of tibia and fibula
tibialis posterior: insertion
tuberosity of navicular, medial cuneiform
tibialis posterior: innervation
tibial n
tibialis posterior: action
- inversion and plantarflexion of foot
- supports medial arch of foot
to remember positions of 3 tendons:
from A-P
Tom, Dick, Harry
- post Tibial
- flex Digitorum longus
- flex Hallucis longus
fibularis longus: location
lateral com leg
fibularis longus: origin
head, upper 2/3 of lateral surface of tibia
fibularis longus: insertion
base of 1st metatarsal and medial cuneiform
fibularis longus: innervation
superficial fibular n
fibularis longus: action
- eversion and plantarflexion of foot,
- supports arches
fibularis brevis: location
lateral com of leg
fibularis brevis: origin
lower 2/3 of lateral surface of tibia
fibularis brevis: insertion
lateral tubercle at base of 5th metatarsal
fibularis brevis: innervation
superficial fibular n
fibularis brevis: action
eversion of foot
tibialis anterior: location
anterior com of leg
tibialis anterior: origin
- lateral surface of tibia
- interosseous membrane
tibialis anterior: insertion
- medial cuneiform
- base of 1st metatarsal
tibialis anterior: innervation
deep fibular n
tibialis anterior: action
- dorsiflexion, inversion of foot
- support medial plantar arch
extensor hallucis longus: location
anterior com leg
extensor hallucis longus: origin
- medial surface of fibula (middle part)
- interosseous membrane
extensor hallucis longus: insertion
- base of distal phalanx of great toe (dorsal surface)
extensor hallucis longus: innervation
deep fibular n
extensor hallucis longus: action
- ext of great toe
- dorsiflexion of foot
extensor digitorum longus: location
ant com leg
extensor digitorum longus: origin
- lateral tibial condyle
- medial surface of fibula (proximal part)
- interosseous membrane
extensor digitorum longus: insertion
via dorsal digital expansions into bases of distal, middle phalanges of lateral 4 toes
extensor digitorum longus: innervation
deep fibular n
extensor digitorum longus: action
- extension of lateral 4 toes,
- dorsiflexion of foot
extensor digitorum longus: location
ant com leg
extensor digitorum longus: origin
- lateral tibial condyle
- medial surface of fibula (proximal part)
- interosseous membrane
extensor digitorum longus: insertion
via dorsal digital expansions into bases of distal and middle phalanges of lateral 4 toes
extensor digitorum longus: innervation
deep fibular n
extensor digitorum longus: action
- extension of lateral 4 toes
- dorsiflexion of foot
fibularis tertius: location
ant com of leg
fibularis tertius: origin
medial surface of fibular (distal part)
fibularis tertius: insertion
base of 5th metatarsal
fibularis tertius: innervation
deep fibular n
fibularis tertius: action
dorsiflexion, eversion of foot