Joints are structures that connect individual bones and may allow bones to move against each other to cause movement. There are two divisions of joints, diarthroses which allow extensive mobility between two or more articular heads, and false joints or synarthroses, joints that are immovable, that allow little or no movement and are predominantly fibrous. Synovial joints, joints that are not directly joined, are lubricated by a solution called synovia that is produced by the synovial membranes. This fluid lowers the friction between the articular surfaces and is kept within an articular capsule, binding the joint with its taut tissue.

Nervous tissue is made of two general cell types. Neurons, the conducting cell type, transmit nerve messages and Glial cells, the non-conducting cell type, serve as support cells and help to protect the neurons.The neuron is the cell that receives and sends the messages received from chemical reactions. Humans have approximately 100 billion neurons in their brain alone. All neurons have three parts. Dendrites receive information from another cell and trasnport the message to the cell body. The cell body, or soma contains the organelles typical of eukaryotic cells and the axon conducts messages away from the cell body, acting as a transport for the message.