BIOL 1030 Lecture Notes - Lecture 6: Paracrine Signalling, Juvenile Hormone, Cardiac Muscle

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Kevin G.Scott

Document Summary

49. 1 nervous systems consist of circuits of neurons and supporting cells. Cnidarians (hydra: nerve net through entire body. Lacks clusters of neurons that perform specialized functions. Have radial nerves connecting to a central nerve ring. Have eyespots, brain, nerve chords and transverse nerves. Have a central nervous system: annelids (leech) Have ventral nerve cords with ganglia, and segmentally arranged clusters of neurons: molluscs (chiton) Some have no cephalization, some have highly intricate nervous system cephalization: vertebrates. Spinal chord, takes information to and from the brain, also acts fast for reflexes excluding the brain. During embryonic development in vertebrates, the central nervous system develops from the hollow dorsal nerve cord. The cavity gives rise to the central canal of the spinal cord as well as the ventricles of the brain, which both fill with cerebrospinal fluid. Grey matter: consists of neurons, unmyelinated axons, anf glia: white matter: bundled axons.