Anatomy study note · Thorax

Interventricular septum

The oblique wall between the two ventricles: a thick lower muscular part and a small, thin upper membranous part.

Key points

• Muscular (lower, thick) + membranous (upper, thin).
• Anterior 2/3: LAD; posterior 1/3: posterior interventricular artery.
• VSD: commonest congenital heart defect; L → R shunt.
• VSD: commonest congenital heart defect.
• Bundle of His in the septum → two branches → Purkinje.
• Endocardium / myocardium / epicardium.

The full note in the atlas also covers

Features · Blood supply · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 5, PDF pp. 610, 622, 635–637
• Inderbir Singh’s Human Embryology, ch. 15, PDF pp. 234–236, 240, 245
• BRS Cell Biology & Histology, 7th ed., ch. 11, PDF pp. 195–196; ch. 8, PDF pp. 145–146

More from the thorax

• Joints of the ribs
• Left atrium
• Left coronary artery
• Left ventricle
• Levatores costarum
• Lung
• Lymph nodes of the thoracic wall
• Main and lobar bronchi
• Mediastinal and tracheobronchial lymph nodes
• Mitral valve
• Pulmonary trunk
• Pulmonary valve

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