vet term

Alveoli and Thoracic Cavity

  • Discussion focuses on the thorax or thoracic cavity, encompassing the chest region.

Thoracic Cavity Structure

  • The thoracic cavity is encapsulated by ribs and contains vital organs such as the lungs and heart.

  • Distinction between terms:

    • In the thoracic cavity: Refers to everything contained within the rib cage.
    • In between the ribs: Pertains to intercostal spaces, defined as inter (between) + costal (ribs).

  • Combining forms:

    • For ribs: costa
    • Example: Intercostal (inter + costa)
    • For chest: thoraco
    • Transition from 'x' to 'c' observed parallel to terminologies like pharynx and larynx.

Related Medical Terms

  • Blood-related terms:

    • Hemo and hemato = blood
    • Suffix -emia = condition of blood

  • Thoracentesis:

    • Definition: Surgical procedure to remove gas or fluid from the thoracic cavity.

Pressure Dynamics in Thoracic Cavity

  • The thoracic cavity functions as a negative pressure system, described as a vacuum.
  • Positive pressure is only found within the lungs.
  • Distinction between conditions that infuse air or fluid externally versus those that are intrinsic to the lungs.

Conditions Related to the Thorax

  • Hemothorax:
    • Definition: Presence of blood in the thoracic cavity due to injuries or vascular issues.

Lung Anatomy

  • Combining forms for lungs:

    • pneumo, pneumano, or pneuo = relating to lungs or air
    • pulmo or pulmono = denotes lung specifically

  • Lobes of the lungs:

    • Right lung has three lobes, left lung has two lobes.
    • Lungs are anatomically consistent across species with some variations in size and color.

Mediastinum

  • The mediastinum is the central compartment in the thoracic cavity, situated between the lungs and housing:
    • Heart
    • Aorta
    • Lymph nodes
    • Esophagus
    • Trachea
    • Nerves

Overview of Conditions and Procedures

  • Pneumothorax: Definition: Air presence in the thoracic cavity leading to various complications.
  • Pulmonary Procedures:
    • Example: Right cadual lung lobectomy = surgical removal of the right caudal lung lobe.
  • Pneumonia: Condition reflecting inflammation of the lungs potentially leading to congestion.

Pleura Overview

  • Pleura: Encases the lungs:

    • Types:
    • Parietal pleura: Lines the thoracic cavity.
    • Visceral pleura: Covers the lungs.

  • Pleural Space: The space between the parietal and visceral pleura, containing pleural fluid, facilitating lung movement during respiration.

  • Distinction between pleural fluid and surfactant, which serves different functions in the respiratory process.

  • Pleuritis: Inflammation of the pleura, causing severe pain.

  • Pleural abscess: A localized pocket of pus between the pleura resulting from infection, characterized by purulent exudate.

Diaphragm Overview

  • The diaphragm separates thoracic and abdominal cavities, controlling breathing.
  • Common form for diaphragm: diaphragmatic or frenno.
  • Diaphragmatic hernia: Occurs when organs move through an abnormal opening in the diaphragm, which can lead to complications based on the size of the defect and involved organs.

Breathing Terminology

  • Inhaling (inspiration) vs. exhaling (expiration).
  • Combining form for breath: spiro or pia.
  • Definitions of conditions:
    • Apnea: Absence of breathing.
    • Dyspnea: Difficulty or painful breathing.
    • Bradypnea: Slow breathing.
    • Tachypnea: Abnormally fast and shallow breathing.
    • Hyperventilation: Increased rate and depth of breathing leading to decreased carbon dioxide in the blood.

Implications of Breathing Changes

  • When hyperventilating, decreased carbon dioxide levels can inhibit the respiration stimulus, potentially leading to cessation of breathing (asphyxiation).
  • Agonal Breathing: A term used to describe near-death or extreme suffering respiration patterns (agonizing to observe).

Oxygen Dynamics

  • Combining forms for oxygen: oxy, oxo.
  • Definitions:
    • Hypoxia: Abnormally low oxygen supply (not blood-related).
    • Hypoxemia: Low oxygen in the blood.
    • Hypercapnia: Increased levels of carbon dioxide, often associated with lower oxygen availability.

Instructional Notes

  • Utilize findings from the session for continued study, emphasizing breakdown of medical terminology for clarity.
  • Next review session scheduled prior to testing on respiratory system concepts.