phys5a1 - Development and Evolution of the Brain Chapter 5...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Development and Evolution of Development and Evolution of the Brain the Brain Chapter 5
Background image of page 1

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

View Full Document Right Arrow Icon
Development Development and Evolution and Evolution of the of the Brain Brain Chapter 5 Chapter 5
Background image of page 2
Chapter 5 3 Terminology & Early Terminology & Early Development Development Embryo : 1 10 weeks after conception zygote morula blastocyst implantation primitive groove neural tube (forward end) hindbrain, (rest) spinal cord
Background image of page 3

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

View Full Document Right Arrow Icon
Chapter 5 4 Human Embryonic Development Human Embryonic Development During Weeks 2 Through 4 During Weeks 2 Through 4
Background image of page 4
Chapter 5 5 Neural Tube in Chick Embryo Neural Tube in Chick Embryo
Background image of page 5

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

View Full Document Right Arrow Icon
Chapter 5 6 Brain Development Brain Development 8 th Week Rudimentary Body Organs head is 1/2 of the total size of the embryo Expansion of old units & addition of new units “ontogeny recapitulates phylogeny” but more columns, etc. Human Brain At Birth ~350 grams 1st year = 1000 g adult = 1200 - 1400 g (~3 lbs)
Background image of page 6
Chapter 5 7 Cellular Processes Shaping the Cellular Processes Shaping the Nervous System Nervous System Cell Proliferation / Induction production of new cells inner surfaces of neural tube generally lasts until birth ventricular or ependymal layer
Background image of page 7

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

View Full Document Right Arrow Icon
Chapter 5 8 Cellular Processes Shaping the Cellular Processes Shaping the Nervous System Nervous System (cont.) (cont.) Cell Migration / Aggregation cell movement to final destinations in the N.S. neuroblasts ~ “trail of ants” radial glia ~ series of guide wires bunching together cerebral cortex: develops from inside-out chemical gradient immunoglobins & chemokines
Background image of page 8
Chapter 5 9 Cellular Processes Shaping the Cellular Processes Shaping the Nervous System Nervous System (cont.) (cont.) Cell Differentiation formation of shape with axons and dendrites usually axons grow before dendrites sometimes axon grows as cell migrates “tail” dendrites grow later; as new axons arrive Intrinsic determination & influence from neighboring cells undifferentiated target large cells produced first take-on characteristics of their particular region e.g. Ach vs. Dopamine cells
Background image of page 9

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

View Full Document Right Arrow Icon
Chapter 5 10 Cellular Processes Shaping the Cellular Processes Shaping the Nervous System Nervous System (cont.) (cont.) Myelination humans: most intense phase occurs shortly after birth temporal sequence: sensory before motor continues throughout life… 1 1 st st last last spinal cord hindbrain midbrain forebrain
Background image of page 10
Chapter 5 11 Cellular Processes Shaping the Cellular Processes Shaping the Nervous System Nervous System (cont.) (cont.) Selective Cell Death “sculpting” developing N. S. target influences the survival of cells
Background image of page 11

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

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 49

phys5a1 - Development and Evolution of the Brain Chapter 5...

This preview shows document pages 1 - 12. Sign up to view the full document.

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