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Muscles of Thoracic Wall (Internal Intercostal Mms (Main Action…
Muscles of Thoracic Wall
Internal Intercostal Mms
Innervation
Intercostal Nerves
Main Action
Interosseous part: depresses ribs
(expiration)
During active (forced) respiration
Superior/Inferior attachments
IA: Superior border of ribs below
SA: Inferior border of ribs
Subcostal Mms
Superior/Inferior attachments
SA: Internal surface of ribs near lower angles
IA: Superior borders of 2nd or 3rd ribs below
Innervation
Intercostal Nerves
Main Action
Probably same as internal intercostal mms
Innermost Innercostal Mms
Superior/Inferior attachments
SA: Inferior border of the ribs
IA: Superior border of ribs below
Innervation
Intercostal Nerves
Main Action
Interchondral Part: elevates ribs
During active (forced):
respiration
External Intercostal Mms
Innervation
N: Intercostal Nerves
Main Action
A:Elevate the ribs during forced inspiration
Superior/Inferior attachments
IA: Superior border of ribs below
SA: Inferior border of ribs
Serratus Posterior Inf.
Innervation
Ant. Rami to T9-T12 thoracic spinal nerves
Superior/Inferior Attachments
SA: Spinous Processes of T11-L2 vertebrae
IA: Inf. borders of 8th-12th ribs near their angles
Main Action
Proprioception (depress ribs)
Transverus Thoracis mms
Transversus Thoracis Mms
Innervation
Intercostal Nerves
Main Action
Weakly depress ribs
Proprioception?
Superior/Inferior attachments
SA: Posterior surface of lower sternum
IA: Internal surfaces of costal cartilages 2-6
Levator Costarum
Innervation
Main Action
Superior/Inferior Attachments
SA: Transverse Processes of C7-T11
IA: Subjacent ribs btw tubercle & angle
Serratus Posterior Sup.
Innervation
2nd-5th intercostal nerves
Main Action
Proprioception (elevate ribs)
Superior/Inferior Attachments
SA: Nuchal ligament, spinous processes of C7-T3 vertebrae
IA: Superior borders of 2nd-4th ribs