Flashcards in final chp 14 nervous system Deck (13)
the mantle layers increase in?
mantle layers are composed of?
the mantle layer sides form masses called?
the marginal layer?
-framework of neuroepithelial and glia cells
-nerve fibers and myelin around the fibers
-thickening of area is due to the nerve fibers
during what month of development does the spinal cord extend the entire length of the embryo?
the third month of development
during the sixth month of development where does the spinal cord end?
1st sacral vertebra
at birth where does the spinal cord end?
levels of 2nd and 3rd lumbar vertebra
at adult where does the spinal cord end?
what are the primary brain vesicles?
what are the secondary brain vesicles?
-myelencephalon or medulla
describe the cephalic flexure?
located in midbrain
-flexure causes the end of the head to bend ventrally
describe the cervical flexure?
located at junction of the myelencephalon and spinal cord