Exam 4 notes - A Nervous system is a control center for the...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
A Nervous system is a control center for the body and organizes all animal behavior Main functional unit is neuron Glial cells play a supporting role The nervous system How do billions function together? In vertabrates CNS is composed of brain and spinal cord PNS is nerves and ganglia Glial cells in the nervous system Oligodendrocytes (in CNS) and Schwann cells (in PNS) form the myelin sheaths around axons Astrocytes play a variety of support roles in CNS Microglia protect nervous system from microorganisms A The central canal of the spinal cord and the ventricles of the brain are hollow and filled with cerebrospinal fluid Alzheimer’s-ventricles will start to get bigger, lose brain cells The autonomic nervous system: Enteric division controls activity of the digestive tract, pancreas, and gallbladder Sympathetic division correlates with fight or flight Parasympathetic is known as rest and digest Development During embryonic development of nervous system Neurons compete for growth-supporting factors in order to survive Some undergo apoptosis, suicide
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Only half of the synapses that from during embryonic development remain As a human brain develops, most profound change occurs in forebrain, which gives rises to cerebrum Brainstem contains centers for receipt and integration of sensory information and controls breathing, cardiovascular activity, swallowing, vomiting, and digestion Arousal and Sleep Also controls arousal and sleep Brainstem has diffuse network of neurons called the reticular formation This regulates the amount and type of information that reaches the cerebral cortex and affects alertness Awake but quiet: alpha waves Awake and intense mental activity: beta waves Deep sleep: delta REM is beta Sleep is essential and may play a role in consolidation of learning and memory The EEG shows special states in sleep Delta waves, alpha, etc. Cerebellum Importat for coordination and error checking during motor, perceptual, and cognitive functions Also involved in learning and remembering motor skills and sequencing of thoughts Thalamus and Hypothalamus The diencephalon includes Thalamus is main input center for sensory information to the cerebrum and main output center for motor info leaving the cerebrum Hypothalamus regulates homeostasis, and circadian rhythms such as the sleep/wake cycle
Background image of page 2
Mammals usually have a pair of suprachiasmatic nuclei (SCN) in the hypothalamus that function as biological clock Biological clocks usually require external cues to remain synchronized with environmental cycles Cerebrum has right and left cerebral hemispheres Right controls left, vice versa Each side of the cerebral cortex has 4 lobes: frontal, temporal, occipital and parietal Frontal: frontal association area, speech Temporal: Smell, Hearing, Auditory association area
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 15

Exam 4 notes - A Nervous system is a control center for the...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online