Lecture 20: Nervous System (Part 1)

What is the function of the nervous system?

functions in information processing

What are the three ways we process information?

sensation, integration, and response

What are non bilateral animals have for nervous system?

just nerve net, circuits of neurons, and glial cell

What are bilateral animals have for nervous system?

circuits of neurons, glial cells, and cephalization

What is the CNS composed of?

Brain and Spinal Cord

What is function of spinal cord?

receives and transport information to the brain and PNS

What is the spinal cord composed of?

white matter (outer layer), gray matter (inner layer), central canal

What is the brain composed of?

white (inner layer) and gray matter (outer layer)

What is the function of PNS?

sends signals to and from the CNS

What does the PNS consist of?

cranial nerves, ganglia outside CNS, and spinal nerves

What carries signal towards the CNS?

sensory neurons

What carries signals away from the CNS?

motor neurons

What is the sympathetic divison?

flight or fight response, digestive system gets inhibitive, heart rate increase, dilation of pupil, lungs relax

What is the parasympathetic division?

rest and digest response and everything goes back to normal function

What is the brainstem?

Composed of midbrain (controls visual reflexes), pons (controls large scale body movements), and medulla oblangata (transfer info between PNS and diencephalon & cerebrum/control automatic function)

What is cerebellum?

controls balance, coordinates movement, involve in learning, memory and motor skills, and hand eye coordination

What is diencephalon?

composed of 3 parts thalamus (sorting center for info, sent to cerebrum), hypothalamus, epithalamus (pineal glands)

What is cerebrum?

controls skeletal muscle contraction and center for learning, perception, emotion, and memory

What connects the brain together?

corpus callosum

What if the corpus callosum is severed?

Spilt brain effect occurs; left and right side function indepedently. the right side is used for patterns, left side is used for thinking

What are the 4 cerebral cortex?

frontal, temporal, occipital, parietal lobe.