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BIOL212
Majors animal: Anatomy of a tapeworm
| Structure | Fucntion |
|---|---|
| Scolex | Anterior end of a tapeworm; lacks sensory structures but possesses modifications for attachment to intestinal wall of host |
| Hooks and suckers | Modified structures on scolex for attachment to host |
| Neck | Constricted portion signifying posterior end of scolex; marks the site of origin of immature proglottids |
| Immature proglottid | Newly produced segment of the tapeworm that has undeveloped reproductive organs |
| Excretory canals | Longitudinal channels running along the outer margins of the body that deliver metabolic waste products out of the tapeworm |
| Mature proglottid | Tapeworm segment that has functional reproductive organs |
| Yolk gland and yolk duct | Ova are combined with yolk and shelled before passing to the uterus |
| Uterus | Shelled, fertilized ova are stored here until proglottid drops off of tapeworm body |
| Ovary | Produces ova |
| Vagina | Point of entry into female reproductive tract through which sperm travel to reach ova; joins with the genital pore |
| Testes | Produce sperm |
| Vas deferens | Canal through which sperm pass as they exit the proglottid through the genital pore |
| Genital pore | External opening common to the male and female reproductive tracts of the tapeworm; sperm exit and enter proglottids through this opening |
| Gravid proglottid | Tapeworm segment containing ripe fertilized ova; this segment is ready to drop off the tapeworm body and be eliminated from the host in feces |