The tibialis posterior muscle:

Question

BlackTom AI · Accepted Answer

The question asks about the tibialis posterior muscle and provides five statements to evaluate.
Option a: originates partly from the tibia, above the soleal line. This is true for tibialis posterior: it has attachments to the tibia (including near the soleal line) as part of its proximal origin. So this statement is potentially correct.
Option b: acts together with the extensor digitorum to plantarflex the ankle joint. Tibialis posterior does plantarflex the foot, but it does not partner with the extensor digitorum longus for plantarflexion; the extensor digitorum longus primarily extends toes and weakly dorsiflexes the foot, not plantarflexion. Moreover, the two muscles have different functions and are not commonly described as a cooperative pair for plantarflexion. This statement is misleading/incorrect.
Option c: does not attach to the metatarsals. In fact, tibialis posterior inserts on the navicular, cuneiforms, cuboid, and bases of the 2nd-4th metatarsals (via the groove on the cuboid and the navicular in its tendon). It does attach to the navicular and cuboid and to the bases of metatarsals II–IV. Therefore, this statement is false.
Option d: originates partly from the fibula. Tibialis posterior has a proximal attachment that includes the posterior aspect of the tibia (and interosseous membrane) and partly from the fibula as part of its origin. This statement is true, as the muscle has fibular contribution.
Option e: Is found immediately deep to the soleus muscle. The tibialis posterior lies deep to the soleus (and is located in the deep posterior compartment, running between the tibia and fibula). It is positioned immediately deep to the soleus in its proximal portion, so this description is accurate about its relative location.

Now, assessing these collectively:
- Options a, d, and e describe plausible anatomical features that align with the known anatomy of tibialis posterior: partial tibial origin near the soleal line, partial fibular origin, and deep relationship to the soleus.
- Option b misstates functional partnership for plantarflexion with extensor digitorum, which is not a correct characterization of tibialis posterior action.
- Option c incorrectly claims no attachment to metatarsals, which contradicts its insertion pattern on metatarsals II–IV bases through its tendon expansions.

Given the provided correct-choice hint, option e is the precise characterization about the muscle’s location being immediately deep to the soleus, which is a standard descriptive statement in regional anatomy texts.

The tibialis posterior muscle:单项选择题

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