The document summarizes the main muscles involved in respiration. It describes the diaphragm as the most important respiratory muscle that separates the chest and abdominal cavities. It also discusses several accessory muscles that assist with respiration, including intercostal muscles between the ribs, scalene muscles in the neck, and sternocleidomastoid muscles in the neck. Finally, it mentions several abdominal muscles - the rectus abdominis, transversus abdominis, internal oblique, and external oblique muscles - that are involved in forced expiration and preventing abdominal contents from blocking the diaphragm.

1. Muscles of Respiration
Meet Desai

3.  RESPIRATORY MUSCLES
1) Diaphragm
2) Accessory Muscles
3) Abdominal Muscles
.

6. 1) DIAPHRAGM:-
 it is a DOME SHAPED , MUSCULAR and
MEMBRANOUS structure that separates
the chest and abdominal cavities.
 Its most important muscles of the
respiration.
ARISE:
Lower part of the sternum , Lower six ribs ,
Attached withe spine .

7. 2) ACCESSORY MUSCLES :-
 Serratus Anterior muscles
 Intercostal muscles
 Scalene muscles
 Sternocleidomastoid muscles
 pectoralis major and minor muscles
 Subclavius muscles

8. Serratus Anterior muscles:-
• ORIGIN:
8-9 Upper Ribs
• INSERTION:
medial border of the scapula between
the superior and inferior angle
thoracic vertebrae.
• NERVE SUPPLY:
Long thoracic nerve(c5 -7)

9. Intercostal muscles:-
 Three Part.
I . External Intercostal
ORIGIN :- Lower border of the ribs.
INSERTION:- Outer lip of the ribs.
II . Internal Intercostal
ORIGIN :- Floor of the Costal Groove Ribs.
INSERTION :-Inner lip of the rbs.
III . Transversus thoracic
ORIGIN :- inner surface of the ribs near the angle
body of the sternum,
Xiphoid process,
3-4 ribs near the sternum.
INSERTION:- inner surface of 2-3 ribs and costal cartilage
 NERVE SUPPLY :-
intercostal nerve (thoracic spinal ner.)

11. Scalene muscles :-
 NERVE SUPPLY :-
Brachial plexus (C3 to 8)
 Three part .
I . Scalenus Anterior :-
ORIGIN :- Anterior Tubercles of the Transverse
processes of Vertebrae C3-6
INSERTION :- Scalene Tubercle of the first ribs
II . Scalenus medius :-
ORIGIN :- Posterior Tubercles of the Transverse
processes of Vertebrae C2-7
INSERTION :- upper surface of the first rib below
the Subclavin artery.
III . Scalenus posterior :-
ORIGIN :- Posterior Tubercles of the Transverse
processes of Vertebrae C5-7
INSERTION :- Lateral surface of the Second ribs

13. Sternocleidomastoid muscles :-
 ORIGIN :-
Manubrium and medial portion of the clavicle .
 INSERTION :-
Mastoid process of the Temporal bone.
 NERVE SUPPLY :-
C2-3 of ventral rami (Cervical plexus)
.

14. pectoralis major and minor muscles :-
 pectoralis major :-
ORIGIN :- anterior surface of the clavicle,
anterior surface of the sternum ,
Six costal cartilages,
Aponeurosis of the external oblique muscle
INSERTION :- Bicipital groove of the humerus
NERVE SUPPLY :- M-L pectoral nerve .
 pectoralis minor :-
ORIGIN :- 3-4 ribs .
INSERTION :- medial border and superior surface
coracoid process of the scapula
NERVE SUPPLY :- M-L pectoral nerve .
.

16. Subclavius muscles:-
ORIGIN :- First rib
INSERTION:- subclavian groove of clavicle
NERVE SUPPLY :-Subclavian nerves
.

17. A. Ractus Abdominis
B. Transversus Abdominis
C. External and Internal Oblique
.
3) Abdominal Muscles :-

18. Ractus Abdominis :-
ORIGIN :- Pubic crest
INSERTION:- Costal cartilages of ribs 5-7
Xiphoid process
NERVE SUPPLY :- Thoracoabdominal nerves
.

19. Transversus Abdominis:-
ORIGIN :- iliac crest , inguinal ligament ,costal cartilages 7-12
INSERTION :- Xiphoid process , linea alba ,pubic crest
NERVE SUPPLY :- Thoracoabdominal nerves(T7-11)
.

20. Internal Oblique muscles :-
ORIGIN :- Inguinal ligament ,iliac crest
INSERTION :- linea alba ,ribs 10 -12
NERVE SUPPLY :- Thoracoabdominal nerves(T7-11)
.

21. External Oblique muscles :-
ORIGIN :- 5-12 ribs
INSERTION :- Xiphoid process ,iliac crest ,pubic crest , linea alba ,ASIS
NERVE SUPPLY :-Thoracoabdominal nerves (T7-11)
.

22. THANKS