Pectinate muscles

{{Infobox anatomy

| Name = Pectinate muscles

| Latin = musculi pectinati atrii dextri,
musculi pectinati atrii sinistri

| Image = Gray internal structure of heart.png

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

| Image2 =Pectinate muscles of right atrium.png

| Caption2 =

| System =

| Precursor =

}}

File:Pectinate muscles of left atrium.png

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.{{Citation|last=Farré|first=Jerónimo|title=6 - Cardiac Anatomy for Catheter Mapping and Ablation of Arrhythmias|date=2011-01-01|url=http://www.sciencedirect.com/science/article/pii/B9781437713688000064|work=Catheter Ablation of Cardiac Arrhythmias (Second Edition)|pages=74–102|editor-last=Stephen Huang|editor-first=Shoei K.|place=Saint Louis|publisher=W.B. Saunders|language=en|doi=10.1016/b978-1-4377-1368-8.00006-4|isbn=978-1-4377-1368-8|access-date=2020-11-16|last2=Anderson|first2=Robert H.|last3=Cabrera|first3=José A.|last4=Sánchez-Quintana|first4=Damián|last5=Rubio|first5=José M.|last6=Benezet-Mazuecos|first6=Juan|editor2-last=Wood|editor2-first=Mark A.}} Pectinate muscles make up the part of the wall in front of this, the right atrial appendage.{{citation needed|date=December 2014}}

In the left atrium, the pectinate muscles are confined to the inner surface of its atrial appendage. 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|date=December 2014}}

Pectinate muscles of the atria are different from the trabeculae carneae, which are found on the inner walls of both ventricles.{{citation needed|date=December 2014}} The pectinate muscles originate from the crista terminalis.{{citation needed|date=December 2014}}

Name

The pectinate muscles are so-called because of their resemblance to the teeth of a comb, as in pecten.{{Citation needed|date=November 2020}}

References

External links

{{LoyolaMedEd|grossanatomy/dissector/labs/thorax/heart/he3_1b.htm}}
{{SUNYAnatomyLabs|20|13|01|04}}
{{UMichAtlas|ht_rt_atrium}} - "Right atrium, internal structure, anterior view"

Category:Cardiac anatomy