Talk:Brain Awareness Week 2012
From Embryology
Cerebrum Comparative Anatomy
- All brains have a similar mechanism of early development, neural plate, tube, etc.
- All brains will have similar regions with similar functions.
- Each animal brain though will end up a different size, shape and complexity (overall and of regions).
- The information shown below is a detailed comparison of different species cerebrum development.
This Information is beyond K12 level and not part of today's demonstration.
Primitive vertebrates
Lamprey |
|
Some fish and amphibians
(Cartilaginous fish (sharks), lobe-finned fish, amphibians)
- remains mainly devoted to olfactory sensation.
- Cerebrum divided into 3 regions.
- ventral - forms the basal nuclei, and contains fibres connecting the rest of the cerebrum to the thalamus.
- lateral - forms the paleopallium.
- dorsal - forms the archipallium.
Ray-finned Fish
In amniotes, the cerebrum becomes increasingly large and complex.
Reptiles
Birds
Mammals
Terms
- Cerebral cortex - (grey matter, cortex) Embryonic structure that will form the cerebral cortex of the brain. Formed in sequence from neural tube, prosencephalon (primary vesicle), telencephalon (secondary vesicle) then cerebrum or cortex.
- Cerebellum - (Latin, cerebellum = little brain) Formed from the rhombencephalon (hindbrain), it is required for coordinated motor activities.
- Diencephalon - At the level of the diencephalon that the optic stalks (optic nerve) extends from the brain. The diencephalon lumen (cavity of the neural tube) will form the third ventricles.
- Encephalon - brain.
- Midbrain - The embryonic neural tube region that will form midbrain structures of the tectum (roof of the midbrain, auditory and visual reflexes) and tegmentum (floor of the midbrain, several brain nuclei) in the adult brain. The mesencephalon is the middle of the 5 secondary brain vesicles formed from the mesencephalon of the primary brain vesicle (there are 3 primary brain vesicles). The mesencephalon lumen (cavity of the neural tube) will form the midbrain aqueduct.
- Telencephalon - (endbrain) The embryonic neural tube region that will form cerebral hemispheres (neocortex, basal nuclei, palaeocortex, archicortex). The telencephalon is the most anterior of the 5 secondary brain vesicles formed from division of the prosencephalon (forebrain) primary brain vesicle (there are 3 primary brain vesicles). The telencephalon lumen (cavity of the neural tube) will form the lateral ventricles.
Pons -
Medulla -