Tarsal flexors Flashcards
M. tibialis cranialis
o Origin: cranial margin of lateral condyle and crest of tibia
o Insertion: medial side on os tarsi I. and Mt I-II.
o Action: flexes tarsus
M. peroneus longus
– also called: m. fibularis longus
o Origin: cranial margin of tibia’s lateral condyle, head of fibula, lateral collateral ligament
o Insertion: first attaches to os tarsi 4+5 (on its plantar surface), then extends to all metatarsal bones’ plantar base
o Action: flexes tarsus
M. peroneus brevis – also called: m. fibularis brevis
o Origin: laterally on distal third of fibula (and partly on tibia)
o Insertion: base of Mt. V.
o Action: flexes tarsus
M. extensor digitorum longus
o Origin: fossa extensoria on lateral femoral condyle
o Insertion: extensor processes of distal phalanx of digits II-V.
o Action: extends stifle and joints of digits and flexes tarsus
M. extensor digitorum lateralis
o Origin: proximal third of fibula
o Insertion: unites with long digital extensor’s tendon to reach digit V. distal phalanx
o Action: extension and abduction of digit V. (and flexes tarsus)
M. extensor digiti I. [hallucis] longus
o Origin: from middle third of fibula
o Insertion: radiates into fascia over metatarsophalangeal joint of digit II.
o Action: extends digit II. (and digit I. if it’s present) (and flexes tarsus)
m. extensor hallucis longus
interspecies differences
not present in Eq
m. peroneus longus
interspecies differences
not present in Eq
m. peroneus brevis
interspecies differences
not present in Eq
m. peroneus tertius
- purely tendinous
o Origin: together with m. extensor digitorum longus from fossa extensoria
o Insertion: on distal tarsal bones, proximal end of Mt, splitting into two branches
o Action: flex the tarsus, extends stifle, important part of passive stay apparatus
m. tibialis cranialis (in Eq)
Doesn’t cover m. extensor digitorum longus,
it’s inserting tendon runs between the two branches of m. peroneus
tertius
