Where is the cruropopliteal canal located?
The canal is located in the deep posterior compartment (fascial space) of the leg. Its course runs downwards from the popliteal fossa towards the medial malleolus.
The canal is formed between two muscle layers:
- Superficial layer: triceps surae muscle (m. triceps surae), specifically between the gastrocnemius (m. gastrocnemius) and soleus (m. soleus) muscles.
- Deep layer: tibialis posterior muscle (m. tibialis posterior), flexor digitorum longus (m. flexor digitorum longus), and flexor hallucis longus (m. flexor hallucis longus) muscles.
Proximally (superiorly), the canal is closed by the popliteal fascia.
Openings and their boundaries
The canal has one inlet and two outlet openings through which vessels and nerves pass.
- Inlet opening: through it, structures enter the canal from above.
- Anteriorly: bounded by the popliteus muscle (m. popliteus).
- Posteriorly: by the tendinous arch of the soleus muscle (arcus tendineus m. solei).
- Upper outlet opening: through it emerges the anterior tibial artery, which perforates the interosseous membrane and passes into the anterior fascial compartment of the leg.
- Laterally: neck of the fibula (collum fibulae).
- Superiorly: popliteus muscle (m. popliteus).
- Medially and inferiorly: origin of the tibialis posterior muscle (m. tibialis posterior).
- Lower outlet opening: distally, the canal opens via the interosseous aperture near the medial malleolus. It is localized at the medial margin of the soleus muscle (m. soleus), medial to the Achilles tendon. In this area, the neurovascular bundle is covered only by the deep and superficial layers of the leg fascia.
What passes through the cruropopliteal canal?
At the inlet opening (at the level of the tendinous arch), the popliteal artery (a. poplitea) divides into two terminal branches: the anterior and posterior tibial arteries. The anterior tibial artery leaves the canal through the upper outlet opening, while the posterior tibial artery, posterior tibial veins, and tibial nerve pass through the canal.
Contents of the canal:
- Tibial nerve (n. tibialis) — occupies the most superficial position relative to the artery within the bundle.
- Posterior tibial artery (a. tibialis posterior) — runs together with the nerve.
- Posterior tibial veins (vv. tibiales posteriores) — accompany the artery of the same name.
The bundle travels downwards towards the medial malleolus (into the tarsal tunnel).
Clinical significance
- Pseudo-intermittent claudication syndrome: occurs due to compression of the neurovascular bundle inside the cruropopliteal canal.
- Surgical approach: the canal serves as an anatomical landmark for surgical access to the posterior tibial artery.
- Tunnel syndrome: may develop when the posterior tibial artery is compressed posterior to the medial malleolus.
Class and exam questions
Where does the anterior tibial artery originate and how does it leave the canal?
It branches off from the popliteal artery almost immediately. It leaves the canal through the upper outlet opening, perforating the interosseous membrane, and enters the anterior fascial compartment of the leg.
What is the mutual arrangement of the artery and nerve in the cruropopliteal canal?
The tibial nerve (n. tibialis) is located most superficially in relation to the posterior tibial artery (a. tibialis posterior).
Where is the lower outlet opening of the canal located?
It is located distally at the medial margin of the soleus muscle, medial to the Achilles tendon. At this site, the neurovascular bundle is covered by the deep and superficial layers of the leg fascia.
What else to study on this topic
- Popliteal fossa (fossa poplitea)
- Posterior leg muscles
- Anterior fascial compartment of the leg
- Medial malleolus and flexor retinaculum
Study the complete topic in the Anatomy course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on the "Cruropopliteal canal" and 1,363 other subject pages
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 295 video lessons by subject
Other topics in the "Anatomical Structures" section
Free video lessons: AnatomyShort lessons with study notes — no registration required.
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.