RIB CAGE KINETICS PART 1 - DIAPHRAGM FUNCTION (BIOMECHANICS OF THORAX )Physiotherapy Tutorial

Movement Science
Movement Science
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Published 2023-07-14
RIB CAGE KINETICS PART 1 - DIAPHRAGM FUNCTION (BIOMECHANICS OF THORAX )Physiotherapy Tutorial

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diagram from Cynthia Norkins and Teachmeanatomy

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summary of the video with the time for reference:

1. VENTILATORY MUSCLES
- HIGH FATIGUE RESISTANCE
- HIGH OXIDATIVE CAPACITY
- CONTRACT RHYTHEMICALLY
- VOLUNTARY AS WELL AS INVOLUNTARY CONTROL
- WORK AGAINST ELASTIC PROPERTY OF LUNGS AND AIRWAY RESISTANCE

2. PRIMARY MUSCLES
- DIAPHRAGM - (70-80) %
- INTER-COASTAL
- SCALENES

3. ACCESSORY MUSCLES
- STERNOCLEIDOMASTOID
- TRAPEZIUS
- PECTORALIS MAJOR/ MINOR
- SUBCLAVIUS
- LEVATOR COSTARUM
- SERRATUS POSTERIOR SUPERIOR/ INFERIOR
- TRANSVERSE ABDOMINIS,
- INTERNAL AND EXTERNAL OBLIQUES
- TRANSVERSE THORACIC

4. DIAPHRAGM
ORIGIN - RIBS, STERNUM, VERTEBRAE
INSERTION - CENTRAL TENDON
- COASTAL FIBERS
- ZONE OF APPOSITION
- FUNCTIONAL UNIT FORMED BY VERTICALLY TRAVELLING FIBERS

- CRURAL FIBERS
- RIGHT AND LEFT CRUS
- TENDONS ARISING FROM (L1-L3 )VERTEBRA

5. ZONE OF APPOSITION
- DIAPHRAGM WILL CONTRACT AND DESCENT DOWNWARD
- ABDOMINAL CONTENTS WILL COMPRESS AND INCREASE INTRA-ABDOMINAL PRESSURE
- THIS STABILIZES THE CENTRAL TENDON AND CONTINUED CONTRACTION OF COASTAL FIBERS WILL LIFT THE RIBS AND MOVE THEM OUTWARD

6. CRURAL FIBERS
- ON CONTRACTION IT DESCENDS THE CENTRAL TENDON
- INCREASED INTRA-ABDOMINAL PRESSURE WILL BE TRANSMITTED ACROSS APPOSED DIAPHRAGM
- THIS WILL HELP COASTAL FIBERS TO EXPAND THE LOWER RIB CAGE AND CREATE NEGATIVE PRESSURE

7.INSPIRAION AND EXPIRATION
- INCREASE IN THORACIC SIZE LEADS TO DECREASED INTRA -PULMONARY PRESSURE
- ACTIVE INSPIRATION
- AS THE DIAPHRAGM RELAXES, THORACIC VOLUME REDUCED
- PASSIVE EXHALATION

#biomechanicsofspine
#spinebiomechanics
#vertebralcolumnbiomechanics
All Comments (8)
  • @shubhrojit_
    What an explanation man! Really impressed. As a second year physio student whose exam is scheduled in a few hours from now, nothing is more helpful than this. Thank you!
  • @tena7273
    I'm from Egypt I'm studying at faculty of physical therapy we all learned because of u thank you ❤️❤️❤️😂😂😂
  • @gauriparab4834
    Sir a whole lecture on global stabilizers mobilizers please sir if possible