Thorax and Breast - MOINA

Origin of Serratus Posterior Superior

Ligamentum nuchae; C7-T3 spinous process

Origin of Serratus Posterior Inferior

T11-L2 spinous process

Origin of Levator Costarum

C7-T11 transverse process

Origin of External Intercostal Muscle

Inferior border of superior border

Origin of Internal Intercostal Muscle

Floors of costal groove of superior rib

Origin of Innermost Intercostal Muscle

Medial edge of costal groove

Origin of Subcostal Muscles

Internal surface of angle of superior rib

Origin of Transversus Thoracis

Posterior surface of interior sternum

Insertion of Serratus Posterior Superior

Upper border of the 2nd-5th ribs

Insertion of Serratus Posterior Inferior

Inferior border, 8th-12th ribs

Insertion of Levator Costarum

Rib tubercles

Insertion of External Intercostal Muscles

Superior border of inferior rib

Insertion of Internal Intercostal Muscle

Superior border of inferior rib

Insertion of Innermost Intercostal Muscle

Superior border of inferior rib

Insertion of Subcostal Muscles

Internal surface of interior rib

Insertion of Transversus Thoracis

Internal surface of 2nd-6th costal cartilages

Nerve Supply of Serratus Posterior Superior

Intercostal nerve

Nerve Supply of Serratus Posterior Inferior

Intercostal nerve

Nerve Supply of Levator Costarum

Intercostal nerve

Nerve Supply of External Intercostal Muscles

Intercostal nerve

Nerve Supply of Internal Intercostal Muscles

Intercostal nerve

Nerve Supply of Innermost Intercostal Muscles

Intercostal nerve

Nerve Supply of Subcostal Muscles

Intercostal nerve

Nerve Supply of Transversus Thoracis

Intercostal nerve

Action of Serratus Posterior Superior

Elevates ribs 2-5 during forced inspiration (deep inhalation)

Action of Serratus Posterior Inferior

Depresses lower ribs (ribs 9-12)

Action of Levator Costarum

Elevates ribs during respiration

Action of Intercostal Muscles

Elevates the ribs, keep intercostal spaces rigid, prevents bulging out (expiration) and being sucked in (inspiration)

Action of Subcostal Muscles

Depresses the ribs

Action of Transversus Thoracis

Depress the ribs (2nd-6th) during forceful exhalation