The common portion of the exam contains 100 points, divided approximately equally between the 9 lectures. The graduate student portion contains an additional 20 points. Please formulate your answers carefully in order to be brief but complete, and please write legibly. Include an example if it will make your definition more understandable. Chordamesoderm Mesodermal tissue resulting from the involution of the dorsal lip of the blastopore during gastrulation which induces the overlying ectoderm to form the neural tube.
Receptors are protein tyrosine kinases.
They are survival factors, necessary to the growth and survival of particular classes of neurons. Neurotropic factor Any one of a number of types of molecules that promote directional outgrowth in individual neurites. Rhombomere One of the segments in the hindbrain, defined by numerous criteria including lineage restriction and unique patterns of gene expression. Circle the appropriate choices. Parasympathetic ganglia 3.