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28 terms

2 Intrinsic Muscles of the Foot

STUDY
PLAY
Actions of intrinsic muscles of the foot
1.hold/lengthen/spread toes on floor while standing
2.propel the foot in stepping and springing
3.maintain arch when ligaments are lax
4.aid in shaping of the foot and toes and completing the curve of the foot in plantar flexion
The bone in the foot that has no muscle attached
Talus, has no action on pronation, supination, plantar and dorsi flexion
actions of 12 muscles with origin on leg and insertion in the foot
all move the ankle and/or tarsus, while 4 flex or extend the toes
(anterior pathway) dorsiflexors
tibialis anterior (supinate)
extensor digitorum longus (pronate)
extensor hallicus longus (supinate)
Tibialis anterior overuse
limitation of depth of plie (acts as an antigravity muscle)
How to prevent tibialis overuse
soften across the front of the ankle, helps to deepen plie by disengaging the tibialis anterior
(lateral pathway) perneals=pronators
peroneus longus (plantar flex)
peroneus brevis (plantar flex)
proneus tertius (dorsiflex)
Perneus Longus and Brevis
muscles that produce "beveled foot"
pass behind lateral malleolus
longus is most superficial
peroneus tertius
some son't have-runs into EDL tendons
Peroneals
-support the lateral arch of the foot due to direction of pull and skeletal bracing
-provide lateral stability to the tarsus on half-toe
-supports calcaneus by passing under the peroneal tubercle
-supports cuboid
Implications for strengthening pronators
-assist with correction of flat lateral arch
-help reduce lateral wobble on half toe
-compensate for morton's short toe or sloped metatarsals
(posterior pathway) plantar flexors
gastrocnemius
soleus
plantaris
Reasons the gastrocnemius is the most powerful muscle in the body
longest force arm
sheer size
diagonal fibers
accepts transfer of force/power in muscle chain
actions of the gastrocnemius
plantar flexion, knee flexion
when the gastrocnemius is most employed
locomotion, pressing on half toe, when knee is straight
soleus
most employed when knee is bent and during adage work, and susceptible to "shin splints" injuries
when to stretch the soleus
after extensive adage work on bent leg
when to stretch gastrocnemius
after extensive work in releve or en pointe
plantaris
vestigial structure
susceptible to tears with quick direction changes
cause of achilles tendonitis
overuse of gastroc/soleus complex (seek medical attention immediately
(medial pathway) supinators + plantar flexors
tibial posterior
flexor digitorum longus
flexor hallucis longus
Tom, Dick, and Harry
all pass behind medial malleolus
produce sickled foot
tight with habitual pronation
flexor digitorum longus, tibialis posterior
prone to over-engagement in dancers (neutralize by engaging intrinsics and EDL)
flexor hallucis longus
prone to tendonitis from overuse, because tendon goes clear down to big toe and gets a lot of friction
muscles that support the medial arch
adductor hallucis
tibialis posterior
peroneus longus
flexor hallucis longus
Functions of the FHL at medial arch
supports arch like the string of a bow
supports the calcaneus medially
supports the talus at its posterior groove
muscles that support medial and lateral arch
tendons of peroneus longus and tibialis posterior, coming from opposite side
implications of strengthening pronators and supinators
assists with correction of pronation and pes planus