Definition

1. Noun:
   • The left upper chamber of the heart: The atrium sinistrum is one of the four chambers of the heart. Specifically, it is the left atrium, which receives oxygenated blood from the lungs via the pulmonary veins and then pumps it into the left ventricle.

Usage

• The term is used in formal, technical, and medical contexts, particularly in anatomy, cardiology, and physiology. It is the Latin anatomical term, with "left atrium" being its common English equivalent.

Examples

• Noun:
  • The oxygen-rich blood from the lungs enters the atrium sinistrum.
  • A clot was discovered in the patient's atrium sinistrum.

Advanced Usage

• In anatomical description: The term is often used in precise anatomical descriptions, textbooks, and research papers.
  • The study focused on the electrical conduction pathways within the atrium sinistrum.

Variants and Related Words

• Left atrium (n): The standard English term for .
  • The left atrium contracts to push blood into the left ventricle.
• Atrium dextrum (n): The Latin term for the right atrium of the heart.
• Atrial (adj): Relating to an atrium of the heart.
  • Atrial fibrillation is a common arrhythmia.

Synonyms

• Left atrium: The direct English synonym.
• Left atrial chamber: A more descriptive synonym.

Related Terms (Not Phrasal Verbs)

• Pulmonary veins: The veins that carry blood into the .
• Mitral valve: The valve between the and the left ventricle.
• Bicuspid valve: Another name for the mitral valve.

Noun

1. the left upper chamber of the heart that receives blood from the pulmonary veins