pedunculus

Basally the pedunculus is much broader than the adjoining oviduct.

Oviduct about half as long as the proximal part of the pedunculus, which is longer than the distal part.

Oviduct is measuring about 2/3 of the length of the proximal part of the pedunculus, which is clearly shorter than its much narrower distal segment.

The calyx (or joined calyces) then continue into a stalk or pedunculus of nerve fibres which ends deep in the brain by a complicated root system composed of a recurrent alpha-lobe, a beta-lobe and sometimes even a third gamma-lobe.

Proximal part of the pedunculus about as broad as the proximal half of the oviduct, which is twice as broad as the distal half; the much narrower diverticulum reaches somewhat further than the bursa of the bursa copulatrix, which is separate from the spermoviduct.