Muscular System By Dr. Jamal Ahmad

1. Muscles of
Chest
Muscles of
chest

2. • Muscles of ribcage
• External intercos
tal
• Internal intercost
al
• Innermost interc
ostal
• Transverse thora
cis
• Subcostal
• Pectoral muscle
s
• Pectoralis majo
r
• Pectoralis min
or
• Serratus anteri
or

3. • External intercostal
• 11 pairs running inferioanteriorly f
rom rib above to rib below and co
ntenues to external oblique of abd
omen
• Lower border of rib above
• Superior border of rib below
• Elevate the ribs to increase thoracic vol
ume
• Intercostal nerve T1-T11

4. •Internal intercostal
• Deep to external intercostal but ru
n inerioposteriorly
• Letral edge of costal cartilage above
• Superior surface of rib below
• Interosseus border decrease thoracic volu
me by depressing the ribcage and costal p
art elevate the ribs
• Intercostal nerve T1-T11

5. • Innermost intercostal
• Deep to internal intercostal m
uscles and sepparrated by nu
rovascular bundle
• Medial margin of costal cartilage of
rib above
• Superior surface of rib below
• Same as internal intercostal

7. •Subcostal
•Inferior surface of lower ribs
•Superior border of rib 2 or 3
below
•Assist the internal intercostal
•Same