Lecture 3: Neurosensory

• What are the different sections of a fish brain?

  Forebrain

  Diencephalon

  Midbrain

  Hindbrain

  Brainstem
• What is the pink part of this fish brain?

  Olfactory Lobe

  
• What is the green part of this fish brain?

  Telencephalon

  
• What is the yellow part of this fish brain?

  Optic lobe

  
• What is the blue part of this fish brain?

  Cerebellum

  
• What is the grey part of this fish brain?

  Myelencephalon

  
• What are the parts of a fish brain in the forebrain?

  Olfactory Lobe

  Telencephalon
• What part of the brain is part of the midbrain?

  Optic lobe
• What part of the brain is part of the hindbrain?

  Cerebellum
• What part of the fish brain is part of the brainstem?

  Mycelencephalon
• The telencephalon serves functions like cerebrum learning, memory, and perception
• The diencephalon of a fish's brain controls homeostasis and endocrine control. It is also the location of the pineal body
• The hindbrain is responsible for tone and equilibrium and the cerebellum is responsible for electroreception and auditory processing
• The brainstem is responsible for basic body functions
• Brain morphology helps determine evolutionary placement, environment, and behavior
• What sensory nerves are at position I?

  Olfaction

  
• What sensory nerves are found at position V?

  Somatic sensory

  
• What sensory nerves are found at position II?

  Vision

  
• What sensory nerves are found at position VII, IX-X?

  Gustation

  
• What sensory nerves are found at position VII?

  Hearing

  
• What sensory nerves are found at position VIII?

  Equilibrium

  
• What sensory nerves are found at position VIII?

  Electroreception

  
• What sensory nerves are found at position VII-X?

  Lateral Line

  
• What are the 5 modalities of a fish's sensory system?

  Mechanoreception

  Chemoreception

  Light Reception

  Electroreception

  Magnetoreception
• What are the three main functions of mechanoreception in fish?

  Detection of vibration/pressure waves

  Equilibrium

  Hearing
• What is used in the detection of vibration/pressure waves in fish?

  Lateral line

  Free neuromasts

  Specialized structures
• What is used in maintaining equilibrium in fish?

  The inner ear
• What is used by fish in hearing?

  Inner ear

  Accessory structures (in hearing specialists)
• Hair Cell: Basic receptor involved in all mechanoreception it is made of many stereocillia, kinocilium, and nerve cells.
• What is a hair cell made of?

  Stereocillia

  Kinocilium

  Nerve cells
• T/F: Stereocilia are true cilia?

  False
• T/F: Kinocilium are not true cilia?

  False
• What is notable about a hair cell?

  They are directionally sensitive
• When water moves towards the kinocilium the cilia are excited
• When water moves away from the kinocilium they are inhibited
• When water moves perpendicular to the kinocilium there is no response by the hair cell
• In this model of a hair cell what is the bracket highlighting?

  stereocilia

  
• In this model of a hair cell is the positive arrow representing excitation or inhibition?

  Excitation

  
• In this model of a hair cell what is the upper black arrow pointing to?

  Kinocilium

  
• In this model of a hair cell is the negative arrow representing excitation or inhibition?

  Inhibition