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Anatomy of the Nervous System - Brain Structures

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  • What are the two main cerebral hemispheres separated by?
    The left and right cerebral hemispheres are separated by the longitudinal fissure.
  • What is the corpus callosum composed of and what is its function?
    The corpus callosum is composed of white matter and serves as the primary pathway for communication between the right and left cerebral hemispheres.
  • What is the cerebral cortex and what type of matter does it contain?
    The cerebral cortex is the wrinkled outer layer of the cerebrum and is composed of grey matter, which contains many neuron cell bodies and dendrites.
  • What are gyri and sulci on the cerebral cortex?
    Gyri are ridges on the cerebral cortex that increase surface area, while sulci are the depressions or grooves between gyri.
  • Name the four major lobes of the cerebral cortex.
    The four major lobes are the frontal lobe, parietal lobe, occipital lobe, and temporal lobe.
  • What is the primary function of the frontal lobe?
    The frontal lobe is associated with higher cognitive functions such as decision making, problem-solving, and voluntary motor control.
  • What is the role of the precentral gyrus in the frontal lobe?
    The precentral gyrus contains the motor cortex, which is involved in planning and executing voluntary movements.
  • What sensory functions are associated with the parietal lobe?
    The parietal lobe processes tactile senses like touch, pressure, pain, itch, and vibration, and is involved in proprioception and visual perception.
  • What is the primary function of the occipital lobe?
    The occipital lobe is the main region for visual processing.
  • What functions are associated with the temporal lobe?
    The temporal lobe is involved in auditory sensation and the comprehension of written and spoken language.
  • What structures make up the limbic system?
    The limbic system includes the amygdala, hippocampus, hypothalamus, and thalamus, and is involved in emotion and behavior.
  • What is the role of the amygdala?
    The amygdala is involved in fear and anxiety responses and long-term memory formation.
  • What is the hippocampus responsible for?
    The hippocampus plays a key role in long-term memory formation.
  • What are the main functions of the hypothalamus?
    The hypothalamus regulates homeostasis, including body temperature, circadian rhythm, food and fluid intake, autonomic nervous system, and controls the endocrine system via the pituitary gland.
  • What is the thalamus' primary function?
    The thalamus acts as the principal relay center for all sensory information except olfaction, processing and sending it to the cerebrum.
  • What are the three main parts of the brainstem?
    The brainstem is composed of the midbrain, pons, and medulla oblongata.
  • What is the function of the midbrain?
    The midbrain processes auditory and visual information and houses nuclei for cranial nerves III and IV involved in eye movements.
  • What role does the pons play in the nervous system?
    The pons acts as a bridge between the cerebellum and brainstem and contains nuclei for cranial nerves V, VI, VII, and VIII.
  • What vital functions are regulated by the medulla oblongata?
    The medulla regulates heart rate, blood pressure, and breathing, and contains nuclei for cranial nerves IX, X, XI, and XII.
  • What is the cerebellum's main function?
    The cerebellum maintains balance and posture by comparing motor commands with proprioceptive and vestibular information and sending corrective commands.