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Thoracic diaphragm (diaphragmatic muscle) (None commonly used; sometimes “DIAm” in scientific literature)
- Target
- None commonly used; sometimes “DIAm” in scientific literature
- Molecular classification
- Other (skeletal muscle/organ)
01
Overview
The **diaphragmatic muscle (thoracic diaphragm)** is a dome-shaped, skeletal muscle that separates the thoracic and abdominal cavities and is the principal muscle of respiration[1][3]. Composed of costal and crural parts with varying fiber types (type I, IIa, IIx/IIb), it enables efficient inspiration by contracting and moving downward, increasing thoracic volume and generating negative intrathoracic pressure for airflow into the lungs[1][2][4]. The diaphragm also functions in increasing intra-abdominal pressure (for defecation, micturition, parturition), acts as a barrier to prevent acid reflux, and aids in blood and lymph circulation[1][3][5]. Dysfunction can cause respiratory failure or contribute to complications in several disease contexts[1][2].
- Other names
- DiaphragmThoracic diaphragmRespiratory diaphragmDIAm (rare in specialized research)
02
Mechanism of action
Not directly targeted; indirect mechanisms include: - Neuromuscular blockade (via nicotinic acetylcholine receptor antagonism) - Corticosteroid-induced muscle atrophy
03
Biological functions
Respiration — principal muscle of inspirationAbdominal pressure modulation — involved in straining (micturition, defecation, parturition, vomiting)Anti-reflux barrier — supports the gastroesophageal sphincterBlood and lymph return — supports thoracoabdominal circulation
04
Disease associations
Respiratory failure — dysfunction can cause or worsen breathing failureNeuromuscular and metabolic diseases — affected in diseases like muscular dystrophy, COPD, and cachexiaOther — role in hiatal hernia, acid reflux, and various systemic disorders
05
Safety considerations
Risk of respiratory insufficiency with impaired or paralyzed diaphragm (e.g., due to neuromuscular junction blockers or injury)Atrophy with disuse or corticosteroidsInjury during abdominal or thoracic surgery
06
Interacting drugs
None specifically targeting the diaphragmatic muscle at the molecular level. Some drugs (e.g., neuromuscular blockers, corticosteroids) affect diaphragm function indirectly
07
Biomarkers
Diaphragm thickness on ultrasound — prognostic marker in critical illness, sepsis, COVID-19Respiratory strength measurements (e.g., maximum inspiratory pressure)
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