Первый слайд презентации: Types of nervous system
Aim of lesson: Compare the types of nervous system of animals
Слайд 2: Jellyfish and hydra
They have very simple nervous system. They don’t have brain or spinal cord. Just nervous cells.
Слайд 3: Flatworms
Their nervous system is ladder like. At the head region, there are two simple brain like structures, which are called ganglia.
Слайд 4: Annelids(earthworm) and Arthropods
They have segmented bodies, each segment has ganglion. Every ganglion controls own segment. Ventral (lower) nerve cord connects all of ganglia to each other. A simple brain connects sensory organs of head.