Nervous System: Function & Organization

The brain and spinal cord; integrates sensory information

Consists of nervous tissues (nerves, ganglia) that are outside the CNS; sends information to and from the CNS, allowing it to communicate with the rest of the body.

Neurons of the PNS that transmit impulses TO CNS

These neurons transmit impulses to effectors (the parts of your body that respond to signals from the nervous system; e.g. muscles, glands, or organs that carry out actions based on the instructions they receive from said neurons.

Controls voluntary movements

Controls involuntary movements. 2 subdivisions: Sympathetic Division and Parasympathetic Division.

Activates “rest and digest” functions.

Activates “fight or flight” response.

• Mechanoreceptors • Chemoreceptors • Photoreceptors • Thermoreceptors • Nociceptors

Respond to pressure or tension changes.

Detect chemicals on tongue and in nose (olfactory)

Respond to light

Sense temperature changes

Detect pain

Exteroceptors: Transmit info about external environment. Proprioceptors: Provide info about movement, position, and equilibrium. Interoceptors: Provide info about internal stimuli.

Nerve impulses tell the brain (hypothalamus) how the body is doing. The hypothalamus tells the pituitary gland to release hormones. These hormones control other glands in the endocrine system.

The nervous system 2regulates heart rate, digestion, body temperature, movement, and brain functions. It’s like the conductor of an orchestra, making sure all the instruments play in harmony.