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In obstetrics, a cephalic presentation or head presentation or head-first presentation is a situation at childbirth where the fetus is in a longitudinal lie and the head enters the pelvis first; the most common form of cephalic presentation is the vertex presentation, where the occiput is the leading part (the part that first enters the birth canal). [1]
Cephalic presentation. Vertex presentation with longitudinal lie: [1] Left occipitoanterior (LOA)—the occiput is close to the vagina (hence known as vertex presentation), facing anteriorly (forward with mother standing) and toward the left. This is the most common position and lie.
Breech presentation with longitudinal lie: [1] Left sacrum anterior (LSA)—the buttocks, as against the occiput of the vertex presentation, like close to the vagina (hence known as breech presentation), which lie anteriorly and towards the left. Right sacrum anterior (RSA)—the buttocks face anteriorly and towards the right.
With regard to the fetal presentation during pregnancy, three periods have been distinguished. [5]During the first period, which lasts until the 24th gestational week, the incidence of a longitudinal lie increases, with equal proportions of breech or cephalic presentations from this lie.
While a transverse lie prior to labor can be manually versed to a longitudinal lie, once the uterus starts contracting the uterus normally will not allow any version procedure. A shoulder presentation is an indication for a caesarean section. Generally, as it is diagnosed early, the baby is not damaged by the time of delivery.
Communicology is the scholarly and academic study of how people create and use messages to affect the social environment. Communicology is an academic discipline that distinguishes itself from the broader field of human communication with its exclusive use of scientific methods to study communicative phenomena.
D. Lawrence Kincaid (born 1945) is an American communication researcher who originated the convergence theory of communication. He was a senior advisor for the Research and Evaluation Division of the Center for Communication Programs and an associate scientist in the Faculty of Social and Behavioral Sciences at the Johns Hopkins Bloomberg School of Public Health.
Many models of communication include the idea that a sender encodes a message and uses a channel to transmit it to a receiver. Noise may distort the message along the way. The receiver then decodes the message and gives some form of feedback. [1] Models of communication simplify or represent the process of communication.