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BRS Embryology, Fifth Edition is a succinct outline-format review for USMLE and course exams, with review questions at the end of each chapter and a comprehensive USMLE-style examination at the end of the book. The text outlines the important facts and concepts tested on the USMLE, within the context of human embryologic development. The book also includes radiographs, sonograms, computed tomography scans, and photographs of various congenital malformations.

This edition has been updated and includes new, additional USMLE-style questions. Clinical images have been placed closer to the relevant text. The BRS for Embryology is a supplemental text that is incredibly helpful. The book helps to make even the most confusing development stages easy to understand and learn. It helps to weed through the details and focus on the main concepts.

A companion website offers the fully searchable text and an interactive question bank.

Preface 1. Prefertilization Events I. Sexual Reproduction II. Chromosomes III. Meiosis IV. Oogenesis: Female Gametogenesis V. Spermatogenesis: Male Gametogenesis VI. Clinical Considerations Study Questions for Chapter 1 Answers and Explanations 2. Week 1 of Human Development (Days 1-7) I. Fertilization II. Cleavage and Blastocyst Formation III. Implantation IV. Clinical Considerations Study Questions for Chapter 2 Answers and Explanations 3. Week 2 of Human Development (Days 8-14) I. Further Development of the Embryoblast II. Further Development of the Trophoblast III. Development of Extraembryonic Mesoderm IV. Clinical Considerations Study Questions for Chapter 3 Answers and Explanations 4. Embryonic Period (Weeks 3-8) I. General Considerations II. Further Development of the Embryoblast III. Vasculogenesis IV. Hematopoiesis V. Clinical Considerations Study Questions for Chapter 4 Answers and Explanations 5. Cardiovascular System I. Formation of Heart Tube II. Primitive Heart Tube Dilatations III. The Aorticopulmonary (AP) Septum IV. The Atrial Septum V. The Atrioventricular (AV) Septum VI. The Interventricular (IV) Septum VII. The Conduction System of the Heart VIII. Coronary Arteries IX. Development of the Arterial System X. Development of the Venous System Study Questions for Chapter 5 Answers and Explanations 6. Placenta and Amniotic Fluid I. Formation of the Placenta II. Placental Components: Decidua Basalis and Villous Chorion III. Placental Membrane IV. The Placenta as an Endocrine Organ V. The Umbilical Cord VI. Circulatory System of the Fetus VII. Amniotic Fluid VIII. Twinning IX. Clinical Considerations Study Questions for Chapter 6 Answers and Explanations 7. Nervous System I. Overview II. Development of the Neural Tube III. Neural Crest Cells IV. Placodes V. Vesicle Development of the Neural Tube VI. Histogenesis of the Neural Tube VII. Layers of the Early Neural Tube VIII. Development of the Spinal Cord IX. Development of the Myelencephalon X. Development of the Metencephalon XI. Development of the Mesencephalon XII. Development of the Diencephalon, Optic Structures, and Hypophysis XIII. Development of the Telencephalon XIV. Development of the Sympathetic Nervous System XV. Development of the Parasympathetic Nervous System XVI. Development of the Cranial Nerves XVII. Development of the Choroid Plexus XVIII. Congenital Malformations of the Central Nervous System Study Questions for Chapter 7 Answers and Explanations 8. Ear I. Overview II. The Internal Ear III. The Membranous and Bony Labyrinths IV. Middle Ear V. External Ear VI. Congenital Malformations of the Ear Study Questions for Chapter 8 Answers and Explanations 9. Eye I. Development of Optic Vesicle II. Development of Other Eye Structures III. Congenital Malformations of the Eye Study Questions for Chapter 9 Answers and Explanations 10. Digestive System I. Overview II. Derivatives of the Foregut III. Derivatives of the Midgut Abbreviated Table of Contents