اختبار علم الجنين الطبي - قسم النظري

During the third week of embryonic development, the central nervous system (CNS) begins to develop. It originates from the ectoderm, a primary germ layer that is responsible for the development of the skin and nervous tissue.

The ectoderm, a primary germ layer, is the essential component from which the neural tube, the precursor to the CNS, arises during the third week of embryonic development.

The neural tube, which will eventually form the brain and spinal cord, emerges from the ectoderm during the third week of embryonic development.

The neural tube, the primordial structure of the central nervous system, originates during the third week of embryonic development. It forms from the ectoderm, the primary germ layer responsible for the development of the skin and nervous system.

The ectoderm, a primary germ layer, serves as the origin for the development of the central nervous system (CNS), particularly the neural tube, which is formed during the third week of embryonic development.

The development of the central nervous system (CNS) begins during the third week of embryonic development, with the formation of the neural tube from the ectoderm.

The ectoderm, a primary germ layer, gives rise to the neural tube, which forms during the third week of embryonic development. The neural tube is the precursor to the brain and spinal cord, forming the central nervous system.

The development of the central nervous system (CNS) stems from the ectoderm, a primary germ layer. This process begins during the third week of embryonic development with the formation of the neural tube.

The neural tube, which gives rise to the brain and spinal cord, forms during the third week of embryonic development from the ectoderm.

The ectoderm, a primary germ layer, is the fundamental component from which the neural tube, the precursor to the CNS, emerges during the third week of embryonic development.