Which of the following tendeons has attachment on sustentaculum Tali ?
**Core Concept**
The sustentaculum tali is a bony projection of the medial aspect of the calcaneus that provides attachment to the tendon of the flexor hallucis longus muscle. This anatomical structure plays a crucial role in the biomechanics of the foot and ankle.
**Why the Correct Answer is Right**
The flexor hallucis longus tendon attaches to the sustentaculum tali, which is a bony projection of the calcaneus. This attachment allows the flexor hallucis longus muscle to play a crucial role in plantarflexion of the first ray and flexion of the great toe. The sustentaculum tali provides a mechanical advantage to the tendon, enabling it to effectively transmit forces to the bone and joint.
**Why Each Wrong Option is Incorrect**
* **Option A:** The Achilles tendon attaches to the calcaneus, but not directly to the sustentaculum tali. It is the tendon of the gastrocnemius and soleus muscles that attaches to the calcaneus via the Achilles tendon.
* **Option B:** The plantar fascia is a fibrous band that supports the arch of the foot, but it does not attach to the sustentaculum tali.
* **Option D:** The peroneus longus tendon attaches to the cuboid bone and does not have a direct attachment to the sustentaculum tali.
**Clinical Pearl / High-Yield Fact**
The sustentaculum tali is a common site for enthesitis and tendonitis in patients with inflammatory conditions such as rheumatoid arthritis. This can lead to pain and dysfunction in the foot and ankle.
**Correct Answer: C. Flexor Hallucis Longus Tendon.**