Your female patient is unable to walk on her tiptoes. You immediately suspect damage to which of the following nerves
**Core Concept**
The ability to walk on tiptoes is primarily governed by the **gastrocnemius** and **soleus muscles**, which are innervated by the **tibial nerve**, a branch of the **sciatic nerve**. Damage to this nerve can lead to weakness or paralysis of these muscles.
**Why the Correct Answer is Right**
The correct answer is related to the nerve responsible for innervating the muscles that enable toe walking. The **tibial nerve** controls the **gastrocnemius** and **soleus muscles**, which are essential for plantarflexion, the movement that allows walking on tiptoes.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not directly related to the primary action of walking on tiptoes.
**Option B:** Incorrect as it does not primarily control the muscles used for toe walking.
**Option C:** Incorrect because, although it is involved in foot movements, it is not the primary nerve for the action described.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the **tibial nerve** is crucial for plantarflexion, and its damage can lead to **foot drop**, making it difficult to walk on tiptoes.
**Correct Answer:** D. Tibial nerve