10. Thoracic Muscles, Its Functional Groups And Diaphram Flashcards
What are intercostal spaces?
They are spaces that lie between adjacent ribs and are filled by intercostal muscles
Explain the location and characteristics of intercostal nerves and major arteries ect
IN and associated major nerves and veils lie in the coastal groove along the inferior margin of the superior rib. They pass in the plane between the inner two layers of the muscle.
In each space the vein= most superior structure= highest in coastal groove
Artery= inferior to vein
Nerve= inferior to artery= often not protected by groove
What structures are superficial to the spaces ?
The deep fascia, superficial fascia,skin. Muscles associated with upper limbs and back overline the spaces
What is meant by innervation of thoracic wall?
Innervation of thoracic wall is mainly by intercostal nerves.
Which are the anterior rami of spinal nerves T1-TX1 in the intercostal spaces between adjacent ribs.
IN END AS ANTERIOR CUTANEOUS BRANCHES which emerge parasternally,between adjacent coastal; cartilages or laterally to midline, on the anterior abdominal wall, to supply the skin
Inter coastal never in the thorax function how?
The in carry
The somatic motor innervation to the muscles of the thoracic wall (inter coastal,subcostal,transverse thoracis mucle)
Somatic sensory innervation from skin and parietal pleura and postganglionic sympathetic fibers to prephiery.
What is the arterial supply?
Is the vessels that supply the thoracic wall which consist of mainly posterior/anterior arteries.
Arteries originate from aorta+ internal thoracic arteries which in turn arise from the subclavian arteries.
What is the venous drainage?
The vD FROM THE THORACIC WAll generally parallels the pattern of the arterial supply
How does Lymphatic drainage take place? By which structures?
Lymphatic vessels of thoracic wall drain mainly into lymph nodes
Which are associated with : internal thoracic arteries (parasternal nodes)
, the head and necks of ribs *(intercoastal nodes), and the diaphragm ( diaphragmatic nodes)
What are the thoracic muscles?
They are the :
External, internal, innermost inntercostal muscles
The subcostal
And the transverse thoracis
What do the thoracis muscles muscles?
They are muscles of the thoracic walls which include:
Those that fill+ support the intercostal spaces
Those that pass between the sternum and ribs
Those that cross several ribs between coastal attachments.
External intercostal muscle of thoracic wall
Has superior attachment- inferior margin of rib above
Has inferior attachment- superior margin of rib below
Has Innervation- intercoastal nerves T1-TX!
It’s function- most active during inspiration, supports intercoastal space, moves ribs superiorly
Internal Intercostal describe
Has superior attachment- a lateral edge if coastal groove of rib above
Has inferior attachment- superior margin of rib below deep to attachment of the related external intercostal
Innervation- intercostal nerves t1-tx1
Function is - most active during expiration- supports intercostal space- moves ribs inferiorly
Innermost intercostal characteristics and function
Has superior attachment- medial edge off costal groove of rib above
Has inferior attachment- internal aspect of superior margin of rib below
Innervation-t1-tx1
Function- acts with internal intercostal muscle
Subcostales- characteristic and function
Superior attachment- internal surface( near angle of lower ribs)
Inferior attacthment- internal surface of 2nd or 3rd rib below
Innervation- related intercostal nerves
Function- depresses ribs
Transversous thoracis
Superior attachment- inferior margins and internal surfaces of costal cartilages of 2nd to 6th rib
Inferior attachment- inferior aspect of body of sternum, xiphoid process and costal cartilages if ribs 1V-VII
Innervation- related intercostal nerves
Function- depresses costal cartilages
