Musculi pectinati

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Musculi pectinati
Section of the heart showing the ventricular septum. (Musculi pectinati labeled at center left.)
Latin	musculi pectinati atrii dextri, musculi pectinati atrii sinistri
Gray's	subject #138 529
Dorlands/Elsevier	m_22/12550106

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In the right atrium, behind the crest the internal surface of the atrium is smooth, while in front of it the muscular fibers of the wall are raised into parallel ridges resembling the teeth of a comb, and hence named the musculi pectinati (pectinate muscles).

In the left atrium, the musculi pectinati, fewer and smaller than in the right auricula, are confined to the inner surface of the auricula. This is due to the embryological origin of the auricles, which are the true atria. Some sources cite that the musculi pectinati are useful in increasing the power of contraction without increasing heart mass substantially.

External links

• -2066743237 at GPnotebook
• MedEd at Loyola grossanatomy/dissector/labs/thorax/heart/he3_1b.htm
• SUNY Labs 20:13-0104
• Atlas of anatomy at UMich ht_rt_atrium - "Right atrium, internal structure, anterior view"

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e Anatomy of torso, cardiovascular system: heart
Structures	atria (interatrial septum, musculi pectinati) • ventricles (interventricular septum, trabeculae carneae, chordae tendinae, papillary muscle) • valves • cusps
Regions	base • apex • grooves (coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular) • surfaces (sternocostal, diaphragmatic) • borders (right, left)
Right heart	(vena cavae, coronary sinus) → right atrium (auricle, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of the inferior vena cava, valve of the coronary sinus) → tricuspid valve → right ventricle (conus arteriosus, moderator band/septomarginal trabecula)  → pulmonary valve → (pulmonary artery and pulmonary circulation)
Left heart	(pulmonary veins) → left atrium (auricle) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)
Layers	pericardium: fibrous pericardium • serous pericardium (pericardial cavity, epicardium/visceral layer) • pericardial sinus myocardium • endocardium • cardiac skeleton (fibrous trigone, fibrous rings)
Conduction system	Cardiac pacemaker • SA node • AV node• bundle of His • Purkinje fibers

v • d • e WikiDoc Research Resources for Musculi pectinati
Articles on Musculi pectinati	Most recent articles on Musculi pectinati • Most cited articles on Musculi pectinati • Review articles on Musculi pectinati • Articles on Musculi pectinati in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Musculi pectinati	Powerpoint slides on Musculi pectinati • Images of Musculi pectinati • Photos of Musculi pectinati • Podcasts & MP3s on Musculi pectinati • Videos on Musculi pectinati
Evidence Based Medicine Regarding Musculi pectinati	Cochrane Collaboration on Musculi pectinati • Bandolier on Musculi pectinati • TRIP on Musculi pectinati
Cost Effectiveness of Musculi pectinati	Cost Effectiveness of Musculi pectinati
Clinical Trials Involving Musculi pectinati	Ongoing Trials on Musculi pectinati at Clinical Trials.gov • Trial results on Musculi pectinati • Clinical Trials on Musculi pectinati at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Musculi pectinati	US National Guidelines Clearinghouse on Musculi pectinati • NICE Guidance on Musculi pectinati • NHS PRODIGY Guidance • FDA on Musculi pectinati • CDC on Musculi pectinati
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Pharmacology Resources on Musculi pectinati	Dosing of Musculi pectinati • Drug interactions with Musculi pectinati • Side effects of Musculi pectinati • Allergic reactions to Musculi pectinati • Overdose information on Musculi pectinati • Carcinogenicity information on Musculi pectinati • Musculi pectinati in pregnancy • Pharmacokinetics of Musculi pectinati •
Genetics, Pharmacogenomics, and Proteinomics of Musculi pectinati	Genetics of Musculi pectinati • Pharmacogenomics of Musculi pectinati • Proteomics of Musculi pectinati
Newstories on Musculi pectinati	Musculi pectinati in the news • Be alerted to news on Musculi pectinati • News trends on Musculi pectinati
Commentary on Musculi pectinati	Blogs on Musculi pectinati
Patient Resources on Musculi pectinati	Patient resources on Musculi pectinati • Discussion groups on Musculi pectinati • Patient Handouts on Musculi pectinati • Directions to Hospitals Treating Musculi pectinati • Risk calculators and risk factors for Musculi pectinati
Healthcare Provider Resources on Musculi pectinati	Symptoms of Musculi pectinati • Causes & Risk Factors for Musculi pectinati • Diagnostic studies for Musculi pectinati • Treatment of Musculi pectinati
Continuing Medical Education (CME) Programs on Musculi pectinati	CME Programs on Musculi pectinati
International Resources on Musculi pectinati	Musculi pectinati en Espanol • Musculi pectinati en Francais
Business Resources on Musculi pectinati	Musculi pectinati in the Marketplace • Patents on Musculi pectinati
Informatics Resources on Musculi pectinati	List of terms related to Musculi pectinati

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .