FIBROUS SKELETON OF HEART
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FIBROUS SKELETON OF HEART
What is the fibrous skeleton of the heart?
- Connective tissue structure
- Provides attachment to your heart valves and myocardium
- Connected to your heart muscle analogous to tendon attachment to skeletal muscle
- Supports your atrioventricular valves:
- Ring-shaped configuration
- Supports your aortic valve:
- Crown-shaped annulus
Components
What are the components of the fibrous skeleton?
- Right fibrous ring
- Left fibrous ring
- Right fibrous trigone
- Left fibrous trigone
- Central fibrous body
FIBROUS RINGS
Right Fibrous Ring
What is the right fibrous ring?
- Part of fibrous cardiac skeleton
- Thickened area of connective tissue
- Surrounds tricuspid valve orifice
- Provides attachment for:
- Valve flaps
- Muscle fibres of your ventricles
- Muscle fibres of your atria
Left Fibrous Ring
What is the left fibrous ring?
- Similar structure to right fibrous ring
- Surrounds bicuspid (mitral) valve orifice
- Thickened area of connective tissue
- Provides attachment for:
- Valve flaps
- Muscle fibres of your ventricles
- Muscle fibres of your atria
FIBROUS TRIGONES
Right Fibrous Trigone
What is the right fibrous trigone?
- Triangular formation
- Located between aortic valve and medial parts of:
- Tricuspid valve
- Mitral valve
- Major component of central fibrous body
Left Fibrous Trigone
What is the left fibrous trigone?
- Thick part of fibrous cardiac skeleton
- Located where aortic and mitral valves meet
- Thick connective tissue at left end
- Where left fibrous ring meets aortic valve
CENTRAL FIBROUS BODY OF HEART
What is the central fibrous body?
- Largest thickening of cardiac skeleton
- Strongest portion of cardiac skeleton
- Occupies central position
- Surrounded by valve rings
- Electrically inert tissue
Functions
What are the functions of the central fibrous body?
- Isolates your atria from your ventricles electrically
- Exception at site of AV conducting system penetration
INFERIOR PYRAMIDAL SPACE
What is the inferior pyramidal space?
- Anatomical region of your heart
- Location where grooves converge:
- Interatrial groove
- Interventricular groove
- Right atrioventricular groove
- Left atrioventricular groove
- Wedges toward central fibrous body
Surrounding Structures
What structures surround the inferior pyramidal space?
- Coronary arteries
- Coronary sinus
- Atrioventricular valve attachments
- Interatrial septum
- Interventricular septum
- Coronary aortic sinuses
- Cardiac conduction system
Tendon of Inferior Pyramidal Space
What is the tendon of Todaro?
- Also called Tendon of Todaro
- Fibrous band within your right atrium
- Serves as anatomical landmark
- Defines boundaries of important structures and regions
BIBLIOGRAPHY
1. Gray H, Lewis W. Angiology. In: Anatomy of the Human Body. 1918. p. 526–542.
2. Gosling JA, Harris PF, Humpherson JR, Whitmore I, Willan PLT. Human anatomy: color atlas and textbook. 6th ed. 2017. 45–58 p.
3. Anderson RH, Spicer DE, Hlavacek AM, Cook AC, Backer CL. (2013). Anatomy of the cardiac chambers. In Wilcox’s Surgical Anatomy of the Heart (4th ed., pp. 13–50). Cambridge University Press.
4. Fritsch H, Kuehnel W. Color Atlas of Human Anatomy. Vol. Volume 2, Color Atlas and Textbook of Human Anatomy. 2005. 10–42 p.
5. Moore K, Dalley A, Agur A. Clinically Oriented Anatomy. Vol. 7ed, Clinically Oriented Anatomy. 2014. 132–151 p.
6. Ho SYen. Anatomy for Cardiac Electrophysiologists: A Practical Handbook. Cardiotext Pub; 2012. 5–27 p.
