Anatomy & Physiology Flashcards

Which tarsal bone articulates with both the tibia and fibula to form the ankle mortise?

Answer: Talus

The talus is the only tarsal bone that articulates with the tibia and fibula superiorly, forming the talocrural (ankle) joint.

The plantar aponeurosis originates from which structure?

Answer: Medial calcaneal tuberosity

The plantar aponeurosis originates from the medial process of the calcaneal tuberosity and fans out to the metatarsal heads.

Which muscle is the primary plantarflexor of the foot and is innervated by the tibial nerve?

Answer: Gastrocnemius

The gastrocnemius is the primary plantarflexor, crossing both the knee and ankle, and is innervated by the tibial nerve (S1-S2).

The sinus tarsi is a canal between which two bones?

Answer: Talus and calcaneus

The sinus tarsi is a cone-shaped canal located between the talus and calcaneus, containing the interosseous talocalcaneal ligament.

Which nerve provides sensation to the first web space of the dorsum of the foot?

Answer: Deep peroneal nerve

The deep peroneal nerve provides cutaneous sensation exclusively to the first web space on the dorsum of the foot.

The Lisfranc joint complex refers to articulations between which structures?

Answer: Tarsometatarsal joints

The Lisfranc joint complex includes all five tarsometatarsal joints, with the Lisfranc ligament connecting the medial cuneiform to the second metatarsal base.

Which intrinsic muscle of the foot abducts the fifth toe and is innervated by the lateral plantar nerve?

Answer: Abductor digiti minimi

The abductor digiti minimi abducts the fifth toe and is innervated by the superficial branch of the lateral plantar nerve.