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  2. Supraesophageal ganglion - Wikipedia

    en.wikipedia.org/wiki/Supraesophageal_ganglion

    The supraesophageal ganglion (also "supraoesophageal ganglion", "arthropod brain" or "microbrain" [1]) is the first part of the arthropod, especially insect, central nervous system. It receives and processes information from the first, second, and third metameres .

  3. Suboesophageal ganglion - Wikipedia

    en.wikipedia.org/wiki/Suboesophageal_ganglion

    Neurons in the suboesophageal ganglion control movement of the head and neck as well. [1] Supraesophageal ganglion(5), Subesophageal ganglion(31) It is composed of three pairs of fused ganglia, each of which is associated with a pair of mouthparts. Therefore, the fused parts are called the mandibular, maxillary and labial ganglia.

  4. Nervous system - Wikipedia

    en.wikipedia.org/wiki/Nervous_system

    Typically, each body segment has one ganglion on each side, though some ganglia are fused to form the brain and other large ganglia. The head segment contains the brain, also known as the supraesophageal ganglion. In the insect nervous system, the brain is anatomically divided into the protocerebrum, deutocerebrum, and tritocerebrum.

  5. Arthropod head problem - Wikipedia

    en.wikipedia.org/wiki/Arthropod_head_problem

    The classical view was that the chelicerae were homologous to the second antennae of crustaceans (i.e., they are innervated from the tritocerebrum), a view based partly on the fact that the chelicerae were innervated from the same ganglion that innervates the labrum, which is the tritocerebrum in crustaceans and insects.

  6. Ganglion - Wikipedia

    en.wikipedia.org/wiki/Ganglion

    A ganglion (pl.: ganglia) is a group of neuron cell bodies in the peripheral nervous system. In the somatic nervous system , this includes dorsal root ganglia and trigeminal ganglia among a few others.

  7. Ventral nerve cord - Wikipedia

    en.wikipedia.org/wiki/Ventral_nerve_cord

    Like the vertebrate spinal cord, the function of the ventral nerve cord is to integrate and transmit nerve signals. It contains ascending and descending neurons that relay information to and from the brain, motor neurons that project into the body and synapse onto muscles, axons from sensory neurons that receive information from the body and environment, and interneurons that coordinate ...

  8. Sympathetic ganglia - Wikipedia

    en.wikipedia.org/wiki/Sympathetic_ganglia

    There are usually 22–23 pairs of these ganglia: three cervical ganglia, 12 thoracic ganglia (the stellate ganglion (cervicothoracic) is formed from the fusion of the first thoracic ganglion with the inferior cervical ganglion), four lumbar ganglia, and four or five sacral ganglia. In the area of the coccyx there is a small ganglion impar. The ...

  9. Parasympathetic ganglia - Wikipedia

    en.wikipedia.org/wiki/Parasympathetic_ganglia

    Each has three roots entering the ganglion and a variable number of exiting branches. The motor root carries presynaptic parasympathetic nerve fibers that terminate in the ganglion and synapse with the postsynaptic fibers that, in turn, project to target organs.