Developmental Biology
11th Edition
ISBN: 9781605354705
Author: Scott F. Gilbert, Michael J. F. Barresi
Publisher: Sinauer Associates is an imprint of Oxford University Press
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Chapter 14, Problem 5DQ
Summary Introduction
To review:
The tethering mechanism of oRG cells, as these are the cells which are able to apply tension to the pial surface and promote folding of the cerebral cortex. Also explain the pulling force necessary to fold the cortex.
Introduction:
During the time course of evolution, their is an expansion of the mammalian neocortex which leads to an increase in cortical surface area followed by varying degree of cortical folding. This folding is attributed to the differences in size and composition of germinal zones of embryo. The SVZ (subventricular zone) posses expansion in gyrencephalic primates, and divided into an inner and outer region. The SVZ also contains intermediate progenitor cells, these IPCs upon division leads to the formation of neurons and outer radial cells (oRG) cells. oRGs are similar to vRGs (ventricular radial glia) in the expression of radial glia markers, the only difference is the lack of an apical attachment to the ventricular surface.
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Required information
30s
REFLEX ARC
Skin-
O
Stimulation of a sensory receptor results in the transmission of an afferent impulse
along the axon of a sensory neuron. These axons end in the spinal cord. In most
cases, the impulse will then travel through an interneuron within the spinal cord to
synapse with a motor neuron.
0:00 / 1:09
Interneurons are located in the
Multiple Choice
Sensory
receptor
Spinal cord
Skin
Sensory receptors
Effector organ
1x
!
Required information
1305
MENINGES
Within the skull and vertebral column, the brain and spinal cord are protected by three
layers of connective tissue collectively called meninges. From superficial to deep, the
meninges consist of the dura mater, arachnoid mater and pia mater.
O
The periosteal layer of dura mater is adherent to the
Multiple Choice
0:00 / 1:39
Outer surface of the skull
Brain surface
Inner surface of the skull
Pia mater
1x
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Activity #1
Explore!!!
NEURONS
OBJECTIVES:
Identify the parts of the neuron.
·
Give the parts and functions of each part of the neuron.
Differentiate the three types of neurons
PROCEDURE:
1. Given is a figure of a neuron. Draw it on your paper and then afterwards label its parts.
Strecture of a Typical Neuron
H
2. Describe and give the function
each of the parts.
A.
B.
C.
D.
E.
F.
G.
H.
Chapter 14 Solutions
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