Bulbous swelling of the cuticle at tip of the anterior end. Inflation of the cuticle in the region of the anterior end of of the esophagus. Oesophagostomum Transverse cervical groove . A cuticular groove that runs transversely as a posterior constriction the cervical inflation in the region of the esophagus. Caudal alae are often confused with bursa.
Spicules usually occur in pairs that are even length or uneven and some species have only one.
Neck of nematodes in the Superfamily Trichuroidea that is made up of a single row of cells called stichocytes .