Fig. 17.1
Gross dissection of the popliteal fossa showing the intact sciatic nerve tightly surrounded by the paraneural sheath
Fig. 17.2
Before the dissection of this nerve, an ultrasound-guided injection of water with a drop of blue dye was made inside the paraneural sheath near the nerve division
Fig. 17.3
The paraneural sheath is cut open. A forceps holds the sheath aside to expose the sciatic nerve
Fig. 17.4
The paraneural sheath is cut open distally to the division of the nerve and sheath
Fig. 17.5
This sciatic nerve actually comprises two separate nerve components colored by blue dye and enveloped in a common paraneural sheath
Fig. 17.6
The tibial nerve component is cut open through the epineurium to show that the injection was not placed intraneurally
Fig. 17.8
A needle is inserted laterally through the biceps muscle
Fig. 17.9
The needle is directed toward the nerve between the two nerve components.
Fig. 17.10
The needle tip has penetrated the paraneural sheath, and dye is injected between the nerve components
Fig. 17.11
Dye between the nerve components has expanded the paraneural sheath, which now can be seen clearly now
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