terminal saccular period

Examples of terminal saccular period in the following topics:

• Development of the Respiratory System

  • Lung development can be divided into distinct stages: the pseudoglandular period, the canalicular period, and the terminal saccular period.
  • The canalicular period spans weeks 16 to 26, during which the lumens of the bronchi enlarge, lung tissue becomes highly vascularized, and respiratory bronchioles and alveolar ducts develop from the terminal bronchioles.
  • The terminal saccular period spans from week 26 to birth.
  • Lastly, the alveolar period spans from birth to eight years of age, during which the terminal saccules, alveolar ducts, and alveoli increase in number.
  • True alveoli appear as indentations in the saccular wall, and septae form to produce divisions in the wall.

• Development of Hearing and Balance

  • Critical periods have been identified for the development of the hearing and vestibular system.
  • The auditory vesicle gives rise to the utricular and saccular components of the membranous labyrinth.
  • Critical periods have been identified for the development of hearing and the vestibular system.
  • Disruption of maturation during this period can cause changes in normal balance and movement through space.
  • Moreover, exposure to abnormal vestibular stimuli during the critical period is associated with irregular motor development.

• Serial and Parallel Processing

  • In short-term memory tasks, participants are given a set of items (e.g. letters, digits) one at a time and then, after varying periods of delay, are asked for recall of the items.
  • Self-terminating implies that comparisons stop abruptly as soon as the target is found, and then the response is generated.
  • If the reaction time slope for a positive trial (where the target was present in the memory set) is about half of the slope for a negative trial (where the target was not present in the memory set), this demonstrates self-terminating processing .
  • Participants may process some serial memory sets using the self-terminating method and others with the exhaustive method.
  • This line graph depicts both positive and negative self-terminating search, comparing length of list to mean reaction time recall.

• Abortion

  • Abortion is defined as the termination of pregnancy by the removal or expulsion from the uterus of a fetus or embryo prior to viability.
  • Abortion is defined as the termination of pregnancy by the removal or expulsion of a fetus or embryo from the uterus prior to viability.
  • The use of abortion procedures is dictated primarily by gestational time period.

• WBC Formation

  • Following this split in differentiation, the subtypes undergo eventual differentiation into terminally-differentiated leukocytes, which typically do not divide independently.