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Pectinate muscles
Section of the heart showing the ventricular septum. (Pectinate muscles labeled at center left.)

Details
Identifiers
Latin	musculi pectinati atrii dextri, musculi pectinati atrii sinistri
TA98	A12.1.01.008 A12.1.03.003
TA2	4024, 4056
FMA	12226
Anatomical terminology [edit on Wikidata]

The pectinate muscles (musculi pectinati) are parallel muscular ridges in the walls of the atria of the heart.

Structure

Behind the crest (crista terminalis) of the right atrium the internal surface is smooth.^[1] Pectinate muscles make up the part of the wall in front of this, the right atrial appendage.^{[citation needed]}

In the left atrium, the pectinate muscles are confined to the inner surface of its atrial appendage.^[1] They tend to be fewer and smaller than in the right atrium. This is due to the embryological origin of the auricles, which are the true atria. Some sources cite that the pectinate muscles are useful in increasing the power of contraction without increasing heart mass substantially.^{[citation needed]}

Pectinate muscles of the atria are different from the trabeculae carneae, which are found on the inner walls of both ventricles.^{[citation needed]} The pectinate muscles originate from the crista terminalis.^{[citation needed]}

Name

The pectinate muscles are so-called because of their resemblance to the teeth of a comb, as in pecten.^{[citation needed]}

References

This article incorporates text in the public domain from page 529 of the 20th edition of Gray's Anatomy (1918)

^ ^a ^b Farré, Jerónimo; Anderson, Robert H.; Cabrera, José A.; Sánchez-Quintana, Damián; Rubio, José M.; Benezet-Mazuecos, Juan (2011-01-01), Stephen Huang, Shoei K.; Wood, Mark A. (eds.), "6 - Cardiac Anatomy for Catheter Mapping and Ablation of Arrhythmias", Catheter Ablation of Cardiac Arrhythmias (Second Edition), Saint Louis: W.B. Saunders, pp. 74–102, doi:10.1016/b978-1-4377-1368-8.00006-4, ISBN 978-1-4377-1368-8, retrieved 2020-11-16

External links

MedEd at Loyola grossanatomy/dissector/labs/thorax/heart/he3_1b.htm
Anatomy photo:20:13-0104 at the SUNY Downstate Medical Center
Atlas image: ht_rt_atrium at the University of Michigan Health System - "Right atrium, internal structure, anterior view"

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, crista supraventricularis), → 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 Bachmann's bundle 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

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