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aortic arch a muscular blood vessel that links the blood vessels from the dorsal and ventral parts of an animal's body http://o.quizlet.com/i/vvhWDRW1zRH5ppWBKH-QYA.jpg cerebral ganglion one of a pair of nerve cell clusters that serve as a primitive brain at the anterior end of some invertebrates, such as annelids http://o.quizlet.com/i/ExX3G-0ECPa0sIf62qf2pA.jpg clitellum in leeches and earthworms, a thick depression of the body wall that functions in reproduction http://o.quizlet.com/i/kn42MZfHZWcG7naRP1jP8Q.jpg crop in the digestive systems of birds and some invertebrates, a sac or pouch that temporarily stores food http://o.quizlet.com/i/TUf5iqu_ef6hDzZtaMJJTg.jpg cuticle a waxy or fatty and watertight layer on the external wall of epidermal cells http://o.quizlet.com/i/9oy6fcn4DXBqokDJZ6xpxA.jpg ectoparasite a parasite that lives on a host but does not enter the host's body http://o.quizlet.com/i/OYYkjfkBqNOpmA4CJ2w0DA.jpg endoparasite any of various parasites that live in the internal organs of animals (especially intestinal worms) http://o.quizlet.com/i/D0EbjLwMTCTs_jLpkHvp9g.jpg esophagus a muscular tube that connects the pharynx to the stomach http://o.quizlet.com/i/Iu1vLuW8UpkjlLFHo4y22A.jpg flame cell in a flat worm, cell that has flagella/cillia that move waste products through the body http://o.quizlet.com/i/8Gk6zAW_y2IKt5-bc3iCFA.jpg gizzard an enlargement of the digestive tract of some invertebrates, such as annelids and insects, that grinds food; a muscular region in the digestive tract of birds that grinds and softens food http://o.quizlet.com/i/Wkra_rENj1jQQhyT6LU99g.jpg intermediate host a host that gives food and shelter to immature stages of a parasite http://o.quizlet.com/i/_0c3KhLHcxhSze4lTD8u8w.jpg nephridium a tubule through which some invertebrates eliminate wastes http://o.quizlet.com/i/p_wSAlDTGs9QH-ktjIqgIg.jpg parapodium in polychaete annelid worms, one of the two flap-shaped appendages that are used for locomotion or gas exchange http://o.quizlet.com/i/GOvNwPmNulU0cGSASuJuGg.jpg pharynx in flatworms, the muscular tube that leads from the mouth to the gastrovascular cavity; in animals with a digestive tract, the passage from the mouth to the esophagus http://o.quizlet.com/i/VPvidY9BVGMi-ad4Pn4fYQ.jpg primary host the host from which an adult parasite gets its nourishment and in which reproduction occurs http://o.quizlet.com/i/BSeyV6ozJbaeZ5MwK9CKPg.jpg proglottids one of the many body sections of a tapeworm; contains reproductive organs http://o.quizlet.com/i/AmVeWeiycA1_ec_OnV2cCA.jpg scolex the head of a tapeworm, which has hooks and suckers to adhere to the host tissues http://o.quizlet.com/i/y0c_rO2O3YXNK_sp5ajQIg.jpg seminal receptacle a saclike organ of female or hermaphroditic invertebrates that stores sperm http://o.quizlet.com/i/H36l5eO_h8ugM43zZ_Yyrg.jpg seminal vesicle one of two glandular structures in male vertebrates that hold and secrete seminal fluid http://o.quizlet.com/i/04QDUy_2AEJJooNysME2HA.jpg tegument the external skin of an organism; on the external surface of a parasitic invertebrate, a layer that counters the defenses of the host's body http://o.quizlet.com/i/8N8njq6hStRqBxFC8uuT2A.jpg setae bristle-like structures that help segmented worms move http://o.quizlet.com/i/NuJKRuFSUH3lV8Kuh3qtSA.jpg