amnion. the innermost fetal membrane, which forms a sac filled with amniotic fluid that surrounds the embryo and later the fetus; as it enlarges it gradually obliterates the chorionic cavity and enfolds the umbilical cord. Called also bag of waters.
cluster breathing. cluster breathing. a breathing pattern in which a closely grouped series of respirations is followed by apnea. The activity is associated with a lesion in the lower pontine region of the brainstem. See also Biot's respiration, Cheyne-Stokes respiration.
What is cluster reduction: Cluster reduction is a syllable structure process. It occurs when a child reduces a consonant cluster to a single consonant. A consonant cluster is when there are 2-3 consonants next to one another in a word (âspâ in space). With the word âspaceâ, a child using cluster reduction might say this as âpaceâ.