Pearson eText Human Anatomy -- Instant Access (Pearson+)
9th Edition
ISBN: 9780135273005
Author: Elaine Marieb, Patricia Wilhelm
Publisher: PEARSON+
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Textbook Question
Chapter 3, Problem 1CYU
Dining which prenatal period is the basic body plan established?
Expert Solution & Answer
Summary Introduction
To review:
The prenatal period during which the establishment of basic body plan takes place.
Introduction:
The development of a fetus takes 38 weeks from the time of fertilization of an egg. This period is known as a prenatal period that is divided into embryonic, fetal, and germinal period. The germinal period spans from the conception to 2 weeks after the fertilization. Third to eighth week is marked by an embryonic period.
Explanation of Solution
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The body plan is established during an embryonic period of prenatal period. The basic body plan is a tube within a tube structure. The outer tube forms the outer body wall and the inner tubes forms the respiratory and digestive tract. These tubes are separated by a serous cavity. The structures in the basic body plan are skin, outer body wall, body cavity, inner tube, kidney, gonads, and limbs. The skin consists of two layers: outer epidermis and inner dermis. The outer body wall includes the trunk muscles.
The inner body tube in the abdominal and thoracic cavity contains the digestive and respiratory tract, respectively. The pericardial and pleural cavity separates the heart and lungs, in the respiratory tract, from the outer body wall. The peritoneal cavity in the abdomen separates the digestive tract from the outer body wall. These cavities are lined by visceral and parietal serosa. The muscle, bone, and skin constitute the limbs.
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Chapter 3 Solutions
Pearson eText Human Anatomy -- Instant Access (Pearson+)
Ch. 3 - Dining which prenatal period is the basic body...Ch. 3 - Which abdominal structures form from the inner...Ch. 3 - Using directional terms (Table 1.1), describe the...Ch. 3 - Describe gastrulation. During which week of...Ch. 3 - What structure induces the formation of the neural...Ch. 3 - Which type or types of mesoderm Cluster into...Ch. 3 - After folding takes place, which embryonic germ...Ch. 3 - Does endoderm form the inner Iining of the inner...Ch. 3 - Which part of the somite forms the vertebrae and...Ch. 3 - What does the splanchnic lateral plate mesoderm...
Ch. 3 - A birth defect in the heart is caused by a...Ch. 3 - Why is respiratory distress common in babies born...Ch. 3 - 1ndicate whether each of the following relates to...Ch. 3 - The outer layer of the blastocyst, which attaches...Ch. 3 - Most birth defects can be traced to disruption of...Ch. 3 - The primary germ layer that forms the trunk...Ch. 3 - Each embryonic structure in column B with its...Ch. 3 - Match each date in column B [approximate time...Ch. 3 - It is currently possible to save some premature...Ch. 3 - Somites are evidence of (a) a structure from...Ch. 3 - Which of the following embryonic structures are...Ch. 3 - Prob. 10RQCh. 3 - When it is 1.5 months old, an average embryo is...Ch. 3 - Gastrulation is the (a) formation of three germ...Ch. 3 - The epiblast forms (a) only the ectoderm, (b) the...Ch. 3 - The limbs develop during the (a) start of the...Ch. 3 - The notochord develops primarily from (a)...Ch. 3 - The fetal period is (a) the �rst 8 weeks of...Ch. 3 - What important event occurs at the primitive...Ch. 3 - What is the function of the amniotic sac and the...Ch. 3 - (a) What is mesenchyme? (b) How does it differ...Ch. 3 - Explain how the flat embryonic disc takes on the...Ch. 3 - In anatomy lab, Thaya pointed to the vertebrae of...Ch. 3 - Neural crest is the one embryonic tissue that is...Ch. 3 - Many embryonic events �rst occur cranially, then...Ch. 3 - Prob. 24RQCh. 3 - Differentiate the outer tube from the inner tube....Ch. 3 - Before Delta studied embryology in her anatomy...Ch. 3 - A friend in your dormitory, a freshman, tells you...Ch. 3 - Insufficient folic acid in the early weeks of...Ch. 3 - Your cat finds a large ball of string and starts...Ch. 3 - When is the earliest time the sex of a fetus can...
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