Gonad Development Week 1: Beginning of Development Week 2: Formation of the Bilaminar Embryo Embryonic Period (Weeks 3-8) Histology: Epithelia Cytoskeletal and Cell Surface Elements Vertebral Column Spinal Nerves Autonomic Nervous System Sympathetic Nervous System Parasympathetic Nervous System Chest Wall Lungs Heart Development of Heart Development of Atrial Septums Atrial Septal Defect Ventricular Septum Fetal Heart Abnormalities Fetal Circulation and Shunts Adult Heart Cardiac Conduction Mediastinum Abdominal Wall Inguinal Hernia Descent of Testis and Femoral Hernia Embryology of Gut Tube Foregut development Pancreas and Duodenum Development Development of the Spleen Peritoneum and Rotation of the Gut Histology of the GI Tract Intestinal Histology Histology of Salivary Glands, Pancreas, and Liver Arterial胃肠道静脉排水的血液供应尿液系统骨盆和腹部成像的尿道尿液系统胚胎学上肢上肢臂丛神经损伤和肩cuff肩cuff下肢腰椎腰椎肿瘤的下肢腰椎供应下肢和脑颈部的脑部和脑颈部脑部和脑颈部的脑部和脑颈部脑部的脑部和颈部脑部的脑部和颈部脑颈部的促进,并促进脑颈部的脑颈部和颈部脑颈部和颈部颈部的脑部和颈部脑颈部和颈部脑颈部的脑部和发展衍生物:外胚层自主神经系统:神经系统轴突转运的脊髓组织学的一般组织副交感神经和交感神经流出横截面