The Nervous System: An Intro Biology 12

Joke of the day:

Brain Review

Use pages 428-430 as well!

FRONTAL LOBE Emotions, reasoning, planning, movement, and parts of speech. Purposeful acts such as creativity, judgment, problem solving, and planning.

PARIETAL LOBE Connect with the processing of nerve impulses related to the senses, such as touch, pain, taste, pressure, and temperature. Language functions

TEMPORAL LOBE Responsible for hearing, memory, meaning, and language Role in emotion and learning. Interpreting and processing auditory stimuli

OCCIPITAL LOBE Involved with the brain's ability to recognize objects Responsible for vision

What is the nervous system? The system of cells, tissues, and organs that regulates the body's responses to internal and external stimuli. In vertebrates it consists of the brain, spinal cord, nerves, ganglia, and parts of the receptor and effector organs. Consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS)

Central Nervous System CNS Coordinating centre for information coming in and going out Includes brain and spinal cord

Peripheral Nervous System PNS Consists mainly of nerves, which are long fibres that connect the CNS to every other part of the body. It is further subdivided into two systems: Somatic Autonomic

Somatic vs. Autonomic Somatic nerves (voluntary) control skeletal muscle, bones, skin and senses. Autonomic nerves (involuntary) control internal organs of the body.

One last subdivision…… Autonomic nerves can be divided into: Sympathetic “on” switch to prepare for stress Parasympathetic “off” switch to return to normal resting levels

Review: Divisions

Cells of the nervous system: The nervous system is composed of trillions of nerve cells and other cells that maintain and support the nerve cells. Glial cells: maintain and support neurons, they do not carry impulses. Neurons: cells that conduct nerve impulses. They function electrically to create thought and action in our bodies (there are three types of neurons)

Neuron Glial Cell

Types of Neurons: Sensory neurons: sense and relay information from the environment to the CNS for processing, collecting information from sensory organs (ears, eyes, etc.) Interneurons: link other neurons together, they relay information Motor neurons:relay information from CNS to effectors (effectors include: mucsles, organs, etc.)

Nerves: Many neurons connected together form a nerve Length is quite variable

To do: Nervous System WS Page 417 Page 437 Questions 1, 2