Question

Fill in the blanks : Layer V neural precursor cells begin to extend neurites in an organized fashion. Actin-containing ____________________________ on growth cones constantly probe the environment. Multiple growth cones appear to be advancing towards a target as a bundle, a process that is called ____________________________. The target appears to​ ​be​ ​secreting​ ​a​ ​molecule​ ​called​ ​a ____________________________,​ ​which​ ​​attracts​​ ​them.

Answer 1

Actin-containing filopodia on growth cones probe the environment, a process referred to as fasciculation that is directed towards a target releasing a chemotactic factor, essential for neural system development.

Step-by-step explanation:

Layer V neural precursor cells begin to extend neurites in an organized fashion. Actin-containing filopodia on growth cones constantly probe the environment. Multiple growth cones appear to be advancing towards a target as a bundle, a process that is called fas- ciculation. The target appears to​ ​secrete​ ​ a​ ​molecule​ ​called​ ​a chemotactic factor,​ which​ ​attracts​ ​them.

During the formation of the neural system, growth factors play a crucial role in signaling ectodermal cells to differentiate appropriately. Neural precursor cells then give rise to the neural plate, neural tube, and eventually the central nervous system (CNS) and peripheral nervous system (PNS) through complex morphological changes, guided by environmental cues and chemotactic factors.