Types of nervous system презентация

Types of nervous system Aim of lesson: Compare the types of nervous system of animals

Jellyfish and hydra They have very simple nervous system. They don’t have brain or spinal cord. Just nervous cells.

Flatworms Their nervous system is ladder like. At the head region, there are two simple brain like structures, which are called ganglia.

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.

Vertebrates All vertebrates have a central nervous system made of brain and spinal cord, and peripheral nervous system made of ganglia and nerves.