The brain
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

The Brain PowerPoint PPT Presentation


  • 73 Views
  • Uploaded on
  • Presentation posted in: General

The Brain. Origins and Diversity. The Generalised Vertebrate Brain. The Generalised Vertebrate Brain. All chordates: Front end of notochord thickened – Brain All vertebrates: Tripartite brain structure Forebrain Midbrain Hindbrain Most primitive condition:

Download Presentation

The Brain

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


The brain

The Brain

Origins and Diversity


The generalised vertebrate brain

The Generalised Vertebrate Brain


The generalised vertebrate brain1

The Generalised Vertebrate Brain

  • All chordates: Front end of notochord thickened – Brain

  • All vertebrates: Tripartite brain structure

    • Forebrain

    • Midbrain

    • Hindbrain

  • Most primitive condition:

    • F – Smell; M – Vision; H – Balance, vibration detection


The generalised vertebrate brain2

The Generalised Vertebrate Brain


The generalised vertebrate brain3

The Generalised Vertebrate Brain


Brain development

Brain Development


Brain development1

Brain Development


Petromyzontida lampreys

Petromyzontida - Lampreys


Petromyzontida lampreys1

Petromyzontida- Lampreys

  • Small cerebellum

    • simple mode of locomotion

  • Rest of hind-brain highly developed

    • To control powerful sucking structures – med. obl.

  • Pineal eye

    • Affect expansion of melanophores – skin colour


Chondrichthyes e g catsharks

Chondrichthyes – e.g. Catsharks


Chondrichthyes e g catsharks1

Chondrichthyes – e.g. Catsharks

  • Pineal organ

    • Non-secretory, no visual function

  • Hypothalamus well-developed

    • Regulation of unconditioned reflexes

    • ‘Higher’ vertebrates

  • Large mid-brain

    • Vision


Amphibia e g frogs

Amphibia – e.g. Frogs

  • Large optic lobes

  • Hippocampalcommissure

    • Link to reptiles, mammals

  • Pineal body

    • Vestigial in adults

  • Cerebellum v. small

    • Inactive animal, moves principally in 1 plane


Reptilia e g lizards

Reptilia – e.g. Lizards

  • Small brain

    • 0.5% of body weight in lizards, several inches in dinosaurs weighing 20 tons

  • Cerebral hemispheres

    • Bigger than amphibians’

    • Olfactory bulbs – linked to Jacobson’s organs


Aves e g pigeons

Aves – e.g. Pigeons

  • Second in brain size to Mammalia

  • Med. obl. ventral flexure

    • Similar to Reptilia

  • Cerebellum large

    • Flight, equilibrium control


Aves e g pigeons1

Aves – e.g. Pigeons

  • Cerebral hemispheres large

    • Massive corpora striata

    • For control of reflex behaviours governing lives of birds

    • Diencephalon hidden


Mammalia e g rabbits

Mammalia – e.g. Rabbits

  • Hemispheres united via corpus callosum

    • Commissural fibres

  • Cerebral hemispheres more extensively developed

  • Cerebellum large, complex


  • Login