functional anatomy of the leg and foot Flashcards
muscle of the leg- posterior superfical
gastrocnemius- plantarflexion
soleus- plantar flexion ( inversion )
plantarus- plantarflexion
popliteus- medial rotaion of knee
gastrocnemius
femoral codyles to the calcaneus via the achelies tendon
medial is larger
plantarflexion
soleus
inversion plantarflexion
deep to gastrocnemius
soleal line to calcaneal via acheleis tendon
planatarus
lateral condyles to calcaneus
small muscle belly
plantarflexion
muscle of the leg posterior deep
flexor hallicus longus- plantarflexion- flexor of big toe
tibialis posterior - plantarflexion and inversion
flexor digitorium longus - plantarflexion and flex digits
tom dick and harry
medial to lateral
flexor hallicus longus
goes to the big toe
flexor big toe
plantar flexion
tibalis posterior
tibia and fibular
interoseus membrane
plantar flexion and inversion
flexor digitorium longus
plantar flexion
flex digits
leg muscle lateral
fibularis longus -eversion and plantar flexion
perineus bravis - dorsi flexion and inversion
fibularis longus
behind lateal malleoulus to first metartarsal
and eversion and plantar flexion
perineus bravis
base of 5th metaratarsal
eversion and plantar flexion
leg muscle anterior
tibialis anterior - dorsiflexion and inversion
extensor hallicaus longus - dorsiflexion
prineus tertius- dorsiflexion and eversion
retinacula of the foot
over tendons
to hold tendons in place and prevent bow string
extensor retinacula
peroneal
flexor
superior extensor retinacula of the foot
bind to tendons of the
TA, EHL, EDL, PT
horizontal above the ankle
inferior extensor retinacula of the foot
bind the TA, EHL,EDL,PT
Y SHAPED AND ANTERIOR TO TALOCURAL LIGAMENTS
peroneal retinacula of the foot
superior and inferior
ninds down P.L AND P.B behind the lateral malleolous
flexor retinacula of the foot
converts bone grooves into cannals for tendons TP FDL FHL
bridges over posterior tibial vessels and nerves
synovial sheath
double layer of synovial membrane
sorrounds tendons as pass through retinacula
smmoth tendons
prevent friction
muscle of the foot dorsal
extensor digitorium bravis
extensor hallucius bravis
muscle of the foot plantar layer 1
flexor digitorium brevis
abductor hallucius
abductor digit minimi
muscles of the foot plantar layer 2
flexor digitorium
flexor hallucus longus
flexor accessorius
lumbricals
muscle of the foot plantar layer 3
adductor halllucus
flexor digit minni
felxor hallucis bravis
muscles of the foot plantar 4th layer
perioneus longus
tibialis posterior
plantar interoseus- 3rd digit adduct
dorsal interossei- 4th digit abduct
function of the foot
weight bear
propulsion
shock absorbs
Gait 2 parts
step off
heel strike
step off
1- plantarflexion extends the MTP joint
tightens plantar aponeurosis
raises medial longnitude arch
head of talus moves superiorly
subtalar joint supernates and foot becomes
rigid as mid tarsal joint is rigid
locks and becomes more stable
increase ability to poperl and push off
heel strike
subtalar joint pronates and mid tarasal joint unlocks and
increase flexibility able to shock absorb
increas ability to adjust to uneven ground
aids change o direction
shifiting surfaces
foot arches
lateral - relative flat but more rigid
medial- higher curve more elastic/ flexible
transverse
bones in medial foot arch
calcaneus talus navicular cunneforms metartarsals 1,2,3
bones is lateral foot arch
calcaneus
talus
cuboid
metartarsals 4,5
why no flat foot
because tibia would take greater force
arch alllows flexibile and shock absorbe
efficent weight bear
foot abilit to change on uneven ground
efficent propulsion
static sructures
are passive support
shape of bones and ligaments
dynamic support structure
muscular support
Medial- FHL, FDL,TP,TA,AH
Lateral- PL PB PT TP ADH
INVERSION
SOLE POINT IN
add
supernate
plantar flex
EVRSION
SOLE POINT OUT
abd
pronate
dorsir
digital expansion
tendon spread- via extensor aponeurosis
forms connective tissue layer on dorsum
allows toes to extend simulatainous
inportant in digital sweep
takes longest possible pathway to flex
flex at MTP JOINT FIRST
THEN IP JOINTS KEPT EXTENDED
THEN PROXIMAL O DISTAL
from interplay of extrinsic and intrinsic foot muscles