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Review Article
Physiology of sleep
Kyu Young Chae
Clin Exp Pediatr. 2007;50(8):711-717.   Published online August 15, 2007
Sleep is a vital, highly organized process regulated by complex systems of neuronal networks and neurotransmitters. Normal sleep comprises non-rapid eye movement (NREM) and REM periods that alternate through the night. Sleep usually begins in NREM and progresses through deeper NREM stages (2, 3, and 4 stages), but newborns enter REM sleep (active sleep) first before NREM (quiet sleep). A...
Original Article
Weight and morphologic development of prenatal human thymus.
Il Soo Ha, Kwang Wook Ko, Je Geun Chi
Clin Exp Pediatr. 1991;34(8):1057-1069.   Published online August 31, 1991
Thymus is a primary lymphoid organ which has an important role in maturation of immune competence. This organ matures earlier than the other organs, and the informations about its prenatal development are essential to understand the maturation of human immunity. To delineate the weight and morphologic development of prenatal thymus, the authors measured the weight of 221, and observed gross and histologic features of...


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