Topography of the neurovascular bundle exit
The main neurovascular bundle of the posterior leg region has a strictly defined exit topography, which is crucial for understanding the operative surgery of this area. The main anatomical landmark is the soleus muscle (m. soleus). The exit of the bundle is localized directly at its medial border.
The lower exit opening of the cruropopliteal canal (canalis cruropopliteus) is located in this zone. Relative to other structures, the bundle is positioned medial to the Achilles tendon. The layered structure at the exit site has an important surgical feature: here the vessels and nerves lie rather superficially. They are covered exclusively by the deep and superficial layers of the crural fascia, making them more accessible, yet more vulnerable to injuries of the posterior aspect of the leg.
Fibular artery
The posterior leg region also contains the fibular artery (a. fibularis, also known as a. peronea). This is an important vascular trunk ensuring blood supply to the structures of the lateral and posterior parts of the leg, which must be considered when planning surgical approaches.
Connections of the fascial spaces of the posterior leg
The cellular tissue of the deep fascial space of the leg is not isolated. It actively communicates with adjacent anatomical regions along the course of the blood vessels passing here. Knowledge of these pathways is critically important for understanding how purulent processes (phlegmons) can spread.
Main pathways of cellular tissue communication:
- In the distal direction (downward): The space communicates with the medial malleolar canal, and through it directly with the fascial spaces of the foot.
- In the proximal direction along the anterior tibial artery (a. tibialis anterior): The tissue is connected to the anterior fascial compartment of the leg.
- In the proximal direction along the posterior tibial artery (a. tibialis posterior): The space communicates with the adipose tissue of the popliteal fossa.
Briefly: answers to topical questions
Which muscles form the walls of the cruropopliteal canal?
The cruropopliteal canal is located between the superficial and deep muscle groups of the posterior leg region. The following muscles take part in forming its walls and openings:
- Popliteus muscle (m. popliteus) — limits the inlet anteriorly and the upper outlet superiorly.
- Soleus muscle (m. soleus) — its tendinous arch (arcus tendineus m. solei) bounds the inlet posteriorly.
- Tibialis posterior muscle (m. tibialis posterior) — its origin limits the upper outlet medially and inferiorly.
Which elements make up the main neurovascular bundle of the posterior leg region?
The main neurovascular bundle of the posterior leg region includes the following elements:
- Posterior tibial artery (a. tibialis posterior) — is the direct continuation of the popliteal artery.
- Posterior tibial veins (vv. tibiales posteriores) — accompany the artery of the same name.
- Tibial nerve (n. tibialis) — lies lateral to the artery and occupies the most superficial position in the bundle.
Fibular vessels (a. et vv. fibulares) are not part of the main bundle, but lie lateral to it.
Which muscles make up the deep layer of the posterior leg region?
The deep layer of the posterior leg region includes flexor muscles. From the medial side to the lateral side, they are arranged as follows:
- Flexor digitorum longus (m. flexor digitorum longus) — lies medially.
- Tibialis posterior muscle (m. tibialis posterior) — is located in the middle.
- Flexor hallucis longus (m. flexor hallucis longus) — lies laterally (however, its tendon runs medially toward the big toe).
These muscles occupy the deep space of the fascial compartment.
To remember the pathways of tissue communication, keep the "Three Arteries" rule in mind: downward to the foot (via the malleolar canal), upward to the popliteal fossa (along the posterior tibial), and forward into the anterior compartment (along the anterior tibial).
Class and exam questions
Where exactly does the neurovascular bundle of the leg emerge?
It emerges at the medial border of the soleus muscle (m. soleus), through the inferior opening of the cruropopliteal canal, positioned medial to the Achilles tendon.
What covers the neurovascular bundle at its exit site?
In the area of the lower outlet opening of the cruropopliteal canal, the bundle is covered only by the deep and superficial layers of the crural fascia.
How does the cellular tissue of the posterior leg region communicate with the foot?
In the inferior direction, the tissue of the deep fascial space transitions into the medial malleolar canal, from which access to the foot spaces opens up.
Through which pathway can infection spread from the posterior compartment to the anterior one?
Communication with the anterior fascial compartment of the leg occurs in the upper part along the course of the anterior tibial artery (a. tibialis anterior).
What else to study on this topic
- Detailed topography of the fibular artery (a. fibularis) and its branches
- Boundaries and walls of the cruropopliteal canal (canalis cruropopliteus)
- Topography of the medial malleolar canal
- Structure of fascial nodes and layers of the crural fascia
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