Strabismus commonly known as crossed eye is a condition i decided to do more research on because , there is a boy in my church that was born with strabismus, he had it up to the age of 4 and when I went home for thanksgiving break his eyes were corrected. I found that strabismus is a condition when the muscles in the eye does not receive information correctly. I also found that there are two types of strabismus, accommodative esotrpia and intermittent exotropia. Accommodative esotropia occurs because of uncorrected hyperopia while intermittent extropia develop because the eyes can not coordinate together. Treatment for strabismus includes prism lenses, vision therapy and eye muscle therapy. The boy in my church wore glasses until he was about 4 years, then had surgery.
http://www.aoa.org/x4700.xml
Sunday, December 16, 2012
Friday, December 14, 2012
Chapter 10
Ephrins ligands- Juxtacrine factors, binding between an ephrin on one cell and the eph receptor on an adjacent cell results in signals sent to each of the two cells
contact inhibition-the mechanism for directional cell movement wherein cells are prohibited from moving backwards due to interactions with the cell membrane of the other migrating cells.
dermal bone- bones that forms in the dermis of the skin such as most of the bones of the skull and face.
cranial Placodes-epidermal thickenings that form neurons and sensory epithelia.
Enamel knot-the signaling center for tooth development, a group of cells induced in the equithelium by the neural crest-derived mesenchyme that secretes paracrine factors that pattern the cusp of the tooth
Pathway secretion- axons travel along a route that leads them to a particular region of the embryo.
Target secretion- axons, once they reach the correct area, recognize and bind to a set of cells with which they may form stable connections
Address secretion- initial patterns are refined such that each axon binds to a small subset of its possible targets.
contact inhibition-the mechanism for directional cell movement wherein cells are prohibited from moving backwards due to interactions with the cell membrane of the other migrating cells.
dermal bone- bones that forms in the dermis of the skin such as most of the bones of the skull and face.
cranial Placodes-epidermal thickenings that form neurons and sensory epithelia.
Enamel knot-the signaling center for tooth development, a group of cells induced in the equithelium by the neural crest-derived mesenchyme that secretes paracrine factors that pattern the cusp of the tooth
Pathway secretion- axons travel along a route that leads them to a particular region of the embryo.
Target secretion- axons, once they reach the correct area, recognize and bind to a set of cells with which they may form stable connections
Address secretion- initial patterns are refined such that each axon binds to a small subset of its possible targets.
Tuesday, December 11, 2012
Chapter 9
Chapter 9
Microspikes-microfilament containing pointed filopodia of the growth cone that elongate and contact to allow axonal migration.
Astrotactin- adhesion protein that helps the neuron maintain adhesion to glial cell.
Dendrites- fine branching extensions of the neuron that are used to pick up electric impulses from other cells
Preplate- formed from the first cortical neurons to be generated and migrate out of the germinal zone
Neural retina- cells of the inner layer that proliferate rapidly and generate a variety of glia, ganglion cells, interneurons and light sensitive photoreceptor neurons.
Cyclopia- a single eye in the center of the face usually below the nose. The result of a mutated Shh gene.
Microspikes-microfilament containing pointed filopodia of the growth cone that elongate and contact to allow axonal migration.
Astrotactin- adhesion protein that helps the neuron maintain adhesion to glial cell.
Dendrites- fine branching extensions of the neuron that are used to pick up electric impulses from other cells
Preplate- formed from the first cortical neurons to be generated and migrate out of the germinal zone
Neural retina- cells of the inner layer that proliferate rapidly and generate a variety of glia, ganglion cells, interneurons and light sensitive photoreceptor neurons.
Cyclopia- a single eye in the center of the face usually below the nose. The result of a mutated Shh gene.
Sunday, December 9, 2012
Encounter
I recently started working at Takoma Academy as an after school tutor. While tutoring one young lady in biology. She told me that she saw her teacher's baby dance. I knew that her teacher was pregnant so I asked how, she then went on to explain that her teacher put earphones on her stomach and when she did that the baby started moving. This reminded me of what we were talking about in class, where scientist have figured out that babies hear sounds in womb.
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