The Nematodes

Cuticle modifications - anterior end

The following six images illustrate nematodes with anterior cuticular modifications. Click on each image with a blue border to show an enlarged, labeled version of the same image.

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cervpapillae.JPG (29549 bytes)

Fig. 1.
Anterior end of an equine strongyle showing a leaf crown (A) surrounding the opening to the buccal cavity.
Fig. 2. Oesophagostomum with cuticular modifications at the anterior end:
A = cephalic vesicle
B = cervical vesicle
C = Cervical alae
Fig. 3.
Anterior end of Ostertagia showing a pair of spine-like cervical papillae (A) in the esophageal region
semsmoster.JPG (12592 bytes) Tcalaesm.gif (23363 bytes)
Fig. 4.
Scanning electron micrograph of Haemonchus contortus showing cervical papillae, cuticular striations and the buccal lancet used for slitting capillaries during blood feeding
Fig. 5.
Scanning electron micrograph of Ostertagia ostertagi showing circular(B) and longitudinal cuticular striations(C). The small mouth opening or stoma is labeled A.

Fig. 6.
Anterior end of Toxocara canis, the roundworm of dogs, showing the tapering lance-shaped cervical alae (A)




Parasites and Parasitic Diseases of Domestic Animals
Dr. Colin Johnstone (principal author)
Copyright 1998 University of Pennsylvania
This page was last modified on January 24, 2000