Interventricular septum

Interventricular septum
Section of the heart showing the ventricular septum.
Interior of dorsal half of heart of human embryo of about thirty-five days. (Labeled as 'septum inferius')
Details
Artery	anterior interventricular branch of left coronary artery and Posterior interventricular artery
Identifiers
Latin	s. interventriculare cordis
MeSH	A07.541.459
TA	A12.1.00.013
FMA	7133
*Anatomical terminology* [edit on Wikidata]

The interventricular septum (IVS), (or ventricular septum, or during development septum inferius), is the stout wall separating the lower chambers (the ventricles) of the heart from one another.

The ventricular septum is directed obliquely backward to the right, and curved with the convexity toward the right ventricle; its margins correspond with the anterior and posterior longitudinal sulci.

Portions

The greater portion of it is thick and muscular and constitutes the muscular interventricular septum.
Its upper and posterior part, which separates the aortic vestibule from the lower part of the right atrium and upper part of the right ventricle, is thin and fibrous, and is termed the membranous ventricular septum (septum membranaceum)..

Development

The muscular part of the interventricular septum derives from the bulboventricular flange which is developed due to differential growth of primitive ventricle and bulbous cordis. Membranous part has a neural crest origin which connects the upper free margin of the bulboventricular flange and anterior and posterior endocardial cushions of atrio ventricular canal. It also gets attached to lower border of spiral septum or the aortico pulmonary septum.

Disorders

Acyanotic heart defect
Ventricular septal defect (VSD), a hole in the interventricular septum

Additional images

Heart normal short axis echo

External links

Look up interventricular septum in Wiktionary, the free dictionary.

Wikimedia Commons has media related to ECHOpedia case 'Ventricular septum defect with right to left shunt'.

Histology image: 128_06 at the University of Oklahoma Health Sciences Center - "Heart and semilunar valve"

Anatomy of the heart

General

Surface

Internal

atria interatrial septum pectinate muscles terminal sulcus ventricles interventricular septum trabeculae carneae chordae tendineae papillary muscle valves cusps atrioventricular septum

cardiac skeleton intervenous tubercle

Chambers

Right heart	(venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of inferior vena cava, valve of coronary sinus) → tricuspid valve → right ventricle (infundibulum, moderator band/septomarginal trabecula) → pulmonary valve → (pulmonary artery and pulmonary circulation)

Left heart	(pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)

Layers

Endocardium	heart valves

Myocardium	Conduction system cardiac pacemaker SA node AV node bundle of His bundle branches Purkinje fibers

Pericardial cavity	pericardial sinus

Pericardium	fibrous pericardium sternopericardial ligaments serous pericardium epicardium/visceral layer fold of left vena cava

Blood supply

Coronary circulation

Development of the circulatory system

Heart

Tubular heart	Truncus arteriosus Bulbus cordis Primitive ventricle Primitive atrium Sinus venosus

Septa	Atrioventricular cushions/Septum intermedium Primary interatrial foramen Septum primum Foramen secundum Septum secundum Foramen ovale Aorticopulmonary septum

Other	Atrioventricular canal Primary interventricular foramen Protein signalling in heart development

Vessels

Arteries	Dorsal aorta Aortic arches Aortic sac

Veins	Anterior cardinal vein Posterior cardinal vein Common cardinal veins

Lymph vessels	Lymph sacs

Extraembryonic
hemangiogenesis

Fetal circulation

umbilical cord: Umbilical vein → Ductus venosus → Inferior vena cava → Heart → Pulmonary artery → Ductus arteriosus → Aorta → Umbilical artery

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