terminal saccules
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terminal sacs — thin walled dilatations that develop at the ends of the respiratory bronchioles during fetal development; they develop a close relationship with the capillaries and their appearance marks the point at which limited respiration becomes possible.… … Medical dictionary
terminal saccular period — the period or phase of prenatal lung development lasting, in different parts of the lungs, from the twenty sixth week or later until near term, and followed by the alveolar period. Walls of the air spaces become thinner and the spaces divide into … Medical dictionary
Development of human lung — The development of human lung arises from the laryngotracheal groove. The larynx, trachea, bronchi and lungs begin to form during the fourth week of embryonic development.[1] At this time, the respiratory diverticulum (lung bud) appears ventrally … Wikipedia
canalicular period — the period or phase of prenatal lung development lasting in different parts of the lungs from the sixteenth or seventeenth week to the twenty sixth week or later, and followed by the terminal saccular period. Basic structures of the gas… … Medical dictionary
respiration, human — ▪ physiology Introduction the process by which oxygen is taken up and carbon dioxide discharged. The design of the respiratory system The human gas exchanging organ, the lung, is located in the thorax, where its delicate tissues are… … Universalium
alveolar period — the period or phase in lung development beginning in utero after the terminal saccular period (about 32 to 36 weeks) and lasting until about eight years of age. The terminal alveolar saccules subdivide several more times and mature alveoli form.… … Medical dictionary
Charles Philippe Leblond — Charles Philippe Leblond, Canadian biologist Born February 5, 1910 Lille, France … Wikipedia
PHÉOPHYCÉES — Les Phéophycées, ou Algues brunes, sont presque exclusivement marines. Par leur taille et par leur abondance, certaines d’entre elles jouent un rôle très important dans la végétation des diverses mers. Les peuplements étendus de Laminariales… … Encyclopédie Universelle
