Tibialis posterior muscle
| Tibialis posterior muscle |
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| The mucous sheaths of the tendons around the ankle. Medial aspect. (Tibialis posterior labeled at top center.) |
| Latin |
musculus tibialis posterior |
| Gray's |
subject #129 484 |
| Origin: |
tibia, fibula |
| Insertion: |
navicular, medial cuneiform |
| Artery: |
posterior tibial artery |
| Nerve: |
tibial nerve |
| Action: |
inversion of the foot, plantar flexion of the foot at the ankle |
| Antagonist: |
Tibialis anterior muscle |
| Dorlands/Elsevier |
m_22/12551177 |
The Tibialis posterior is the most central of all the leg muscles.
It is the key stabilising muscle of the lower leg.
Origin and insertion
It originates on the inner posterior borders of the tibia and fibula. It is also attached to the interosseous membrane, which attaches to the tibia and fibula.
The tendon of tibialis posterior the decends down posterior to the medial malleolus and to the plantar surface of the foot where it inserts on to the tuberosity of the navicular, the first and third cuneiforms, the cuboid and the second, third and fourth metatarsals.
Function
As well as being a key muscle for stabilisation, the tibialis posterior muscle also contracts to produce inversion of the foot and assists in the plantar flexion of the foot at the ankle.
Additional images
Tibialis posterior also has a major role in supporting the medial arch of the foot and therefore dysfunction can lead to flat feet in adults (as well as unopposed eversion as inversion is lost, leading to a valgus deformity).
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List of muscles of lower limbs |
| ILIAC REGION/ILIOPSOAS |
psoas major/psoas minor - iliacus |
| BUTTOCKS |
gluteals: (maximus, medius, minimus) - tensor fasciae latae
lateral rotator group: piriformis - obturator externus/obturator internus - inferior gemellus/superior gemellus - quadratus femoris |
| THIGH |
anterior compartment: sartorius - quadriceps (rectus femoris, vastus lateralis, vastus intermedius, vastus medialis) - articularis genu
posterior compartment/hamstring: biceps femoris - semitendinosus, semimembranosus
medial compartment: gracilis - pectineus - adductor (brevis, longus, magnus) |
| LEG |
anterior compartment: tibialis anterior - extensor hallucis longus - extensor digitorum longus - fibularis tertius
posterior compartment: superficial - calf/triceps surae (gastrocnemius, soleus) - plantaris - deep - popliteus - tarsal tunnel (flexor hallucis longus, flexor digitorum longus, tibialis posterior)
lateral compartment: fibularis muscles (longus, brevis) |
| FOOT |
dorsal - extensor digitorum brevis - extensor hallucis brevis
plantar - 1st layer (abductor hallucis, flexor digitorum brevis, abductor digiti minimi) - 2nd layer (quadratus plantae, lumbrical muscle) - 3rd layer (flexor hallucis brevis, adductor hallucis - flexor digiti minimi brevis) - 4th layer (dorsal interossei, plantar interossei) |
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