Chapter 29 Sparkpage assignment

Central Nervous System (CNS)

The complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord.

Peripheral Nervous System (PNS)

The nervous system outside of the Brain and Spinal Cord.

Somatic Nervous System

Associated with skeletal muscle voluntary control. The SoNS consists of afferent nerves or sensory nerves, and efferent nerves or motor nerves.

Autonomic Nervous System

Nervous system responsible for doing involuntary actions within the body that the person has no control over. Some examples are digestion, *breathing, and hearthrate.

Parasympathetic- Relating to when the person is unconscious. Some examples are eye movements and sweating.

Sympathetic- Responsible for up and down regulating in many homeostatic mechanisms in organisms.

Sensory Neuron

Sensory neurons are nerve cells within the nervous system responsible for converting external stimuli from the organism's environment into internal electrical impulses. They react to stimuli.


A neuron that works as the middle one that transmits signals between neurons.

Motor Neuron

Located in the spinal cord, indirectly controls effector organs, mainly muscles and glands.

Neuromuscular Junction

Chemical synapse formed by the contact between a motor neuron and a muscle fiber. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction.


Organic chemical within the brain that helps nerves transmit signals to eachother.


Hormone within the brain.


Hormone within the brain.


A synapse is a junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter.

White and Gray matter

White matter is composed of bundles of myelinated nerve cell projections (or axons), which connect various gray matter areas (the locations of nerve cell bodies) of the brain to each other, and carry nerve impulses between neurons.

Grey matter contains most of the brain's neuronal cell bodies. The grey matter includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision making, and self-control.

Cerebral Cortex

The outer layer of the cerebrum, composed of folded gray matter and playing an important role in consciousness.

Limbic System

The primary structures within the limbic system include the amygdala, hippocampus, thalamus, hypothalamus, basal ganglia, and cingulate gyrus. The amygdala is the emotion center of the brain, while the hippocampus plays an essential role in the formation of new memories about past experiences.

Created By
Dan Russo


To my marvelous teacher Mr. G enjoying his stay with Michael Mouse in Diddly Land.

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