Muscles of the thoraic cage Flashcards
where are the subcostals found and what do they comprise of
They comprise of thin slips of muscle, which run from the internal surface of one rib, to second and third ribs below. The direction of the fibres parallels that of the innermost intercostal.
attachement action and innervation of the subcostals
Attachments: These originate from the inferior surface of the lower ribs, near the angle of the rib. They then attach to the superior border of the rib 2 or 3 below.
Actions: Share the action of the internal intercostals
Innervation: Intercostal nerves
attachement action and innervation of the transversus thoracis
Attachments: From the posterior surface of the inferior sternum to the internal surface of costal cartilages 2-6.
Actions: Weakly depress the ribs.
Innervation: Intercostal nerves (T1-T11).
what is the transversus thoracis continuous with
transversus abdominis inferiorly
attachement action and innervation of the innermost intercostals
Attachments: Originates from the medial edge of the costal groove and inserts into the superior surface of the rib below.
Actions: The interosseous part reduces the thoracic volume by depressing the ribcage, and the interchondral part elevates the ribs.
Innervation: Intercostal nerves (T1-T11)
attachement action and innervation of the internal intercostals
Attachments: Originates from the lateral edge of the costal groove and inserts into the superior surface of the rib below.
Actions: The interosseous part reduces the thoracic volume by depressing the ribcage, and the interchondral part elevates the ribs.
Innervation: Intercostal nerves (T1-T11).
attachement action and innervation of the external intercostals
Attachments: Originate at the lower border of the rib, inserting into the superior border of the rib below.
Actions: Elevates the ribs, increasing the thoracic volume.
Innervation: Intercostal nerves (T1-T11).
which muscles are the deepest of the intercostal muscles
the innermost intercostals
which muscle has a similar structure to the internal intercostals
the innermost intercostals
where are the innermost intercostals found
the most lateral portion of the intercostal spaces.
how are the innermost intercostals separated from the internal intercostals
by the intercostal neurovascular bundle
where do the flat internal intercostals lie
deep to the external intercostals
in what direction do th internal intercostals run and what are they continuous with
. Like the external intercostals, they run from the rib above to the one below, but in an opposite direction (inferoposteriorly). They are continuous with the internal oblique muscle of the abdominal wall.
