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Earthworm Structure Model

Название Продукция: Earthworm Structure Model
модель: ZM073

Подробно о продукте: Earthworm Structure Model

Model of Earthworm Anatomy
Usage
This model is a visual aid for teaching zoology in high schools or colleges.
Content
It shows anterior-mouth section, surrounding-mouth section, body sections, between-section gyri, bracelet belt, bristles, a pair of male gonopores which are at the lateral-ventral part of the 18th body section, one female gonopore which is at the middle ventral part of the 14th body section, three pairs of inseminating openings at the lateral sides of the between-section gyri of 6/7, 7/8 and 8/9.
the cross section shows epithelia, bristles, vertical and loop muscles of the body wall, appendix, intestinal wall, intestinal cavity and the cross sections of dorsal vessel, ventral-nerve vessel and ventral neurochord.
the digestive system shows mouth, throat(3rd,4th sections), esophagus (5th--8th sections), gizzard (8th--9th sections), stomach (9th--14th sections), intestine (since 15th section), appendix (16th-23rd sections) the blood circulatory system shows the dorsal vessel, the ventral vessel, the esophagus vessel (lateral-ventral side of the esophagus in the front 13 sections), stomach vessel, anterior loop vessel (two pairs, located at the 10th and 11th sections), ventral-nerve vessel, 4 pairs of hearts (long-sack-shaped, located at the 7th, 9th, 12th and 13th sections, each connects to the dorsal and the ventral vessel; the branches of the back two hearts connect to stomach vessel). the nerve system shows a pair of dorsal-throat ganglions (3rd section dorsal-throat), ventral-throat ganglion which connects to the neurocord at the ventral 3rd section. The ventral neurocord swells at the center of each section and branches out three pairs of peripheral nerves. The model shows surrounding-throat nerves as well.
the reproductive system shows two pairs of seminal sacs, which located at the 10th and 11th sections. One side opens up to show the seminal sac and seminal funnel, and two pairs of seminal vesicles, which are located at the 11th and 12th sections. The spermaducts parallel from 13th section to 18th section and converge with the prostate ducts; one pair of ovaries attached to the membrane back of sections 12/13. The ovaries are grape-shaped. One pair of ovary funnels located at the membrane front of sections 13/14 facing the ovaries. One pair of oviducts pass through the membrane and merge at the 14th section; There are three pairs of inseminating sacs located at the sections no. 7, 8, and 9.
Size: 60 cm in length
Maintenance:
Don't use chemical detergent to clean; use clean wet cloth.
coat it with a plastic bag and place in a cool and dry place.