muscles of the thoracic wall Flashcards
Name the 3 “layers” of intercostal muscles
External, internal + innermost
The external intercostal muscles have an … orientation
Inferomedial (form kind of a V)
In the region of the costal cartilages, the external intercostal muscles form …
The external intercostal membrane
The internal intercostal muscles have an … orientation
Inferolateral (form kind of like an inverse V)
Name the aponeurotic band of the internal intercostal muscles in the region of the costal cartilages
Internal intercostal membrane
Name the muscles that originate from the posterior portion of the sternum
Transversalis thoracis
The … muscles are found in the posterior part of the thoracic wall + are very deep
Subcostal
The intercostal nerves + vessels run in the … space, between the … intercostal muscles
Intercostal, internal + innermost
The posterior intercostal arteries originate from…
The aorta + its branches
The anterior intercostal arteries originate from…
The internal thoracic artery
The intercostal veins run … to the intercostal arteries
Parallel
The main branches of the intercostal vessels are located in the … border of the superior rib
Inferior
Intercostal vessels + nerves have branches to innervate …
The superficial fascia + skin
The parasternal nodes of the thoracic wall drain into …
The bronchiomediastinal trunk
The intercostal lymph nodes drain either into… or …
The bronchiomediastinal trunk or the thoracic duct
Name the type of lymph nodes in the thoracic area that are located below the sternum
Diaphragmatic nodes
The intercostal muscles are innervated by the … rami of spinal nerves
Anterior
The nerves innervating the intercostal muscles go from segment … to segment … of the spinal cord
T1 to T11
Spinal nerve that innervates the intercostal muscles + contributes to the brachial plexus
T1
The intercostobrachial nerve innervates … + arises from …
The axillary region, from T2
Dermatome T1 corresponds to…
The medial portion of the forearm, not the torax!
Dermatome T4 corresponds to…
The mammary level (nipples)
Dermatome T6 corresponds to…
The xiphoid process
Dermatome T10 corresponds to…
The umbilicus
Explain the way the nerves + vessels are arranged within the intercostal space
VAN
