Advanced Anatomy Lab 4: Muscles Exam Questions and Answers With
complete solution–Expert Verified | Latest Questions 2025
Where are the external intercostal muscles located?: within intercostal spaces from
posterior thorax to costochondral joints
What are the attachments of the external intercostal muscles?: inferior boarder of
rib above and superior boarder of rib below
What is the actions of external intercostal muscles?: aid in inspiration (elevate ribs;
increase thoracic volume)
What is the innervation of the external intercostal muscles?: intercostal nerves
Where are the internal intercostal muscles located?: within intercostal spaces from pos-
terior thorax to sternum
What are the attachments of the internal intercostal muscles?: inferior border of rib
or costal cartilage above and superior boarder of rib or costal cartilage below
What is the action of the interosseous part of internal intercostal muscles?: aid
in expiration (depresses rib; decrease thoracic volume)
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, What is the action of the interchondral part of internal intercostal muscles?: aid
in inspiration (elevate costal cartilage; increase thoracic volume)
What is the innervation of the internal intercostal muscles?: intercostal nerves
Where is the innermost intercostal muscles located?: within lateral intercostal spaces
What are the attachments of the innermost intercostal muscles?: inferior boarder
of rib above and superior boarder of rib below
What is the action of the innermost intercostal muscles?: aid in expiration (depresses
ribs; decrease thoracic volume)
What is the innervation of the innermost intercostal muscles?: intercostal nerves
What are the attachments of the subcostal muscles?: inferior boarder of ribs near angles
and superior boarder of 2nd and 3rd rib inferior
What is the action of the subcostal muscles?: depresses ribs
What is the innervation of the subcostal muscles?: intercostal nerves
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complete solution–Expert Verified | Latest Questions 2025
Where are the external intercostal muscles located?: within intercostal spaces from
posterior thorax to costochondral joints
What are the attachments of the external intercostal muscles?: inferior boarder of
rib above and superior boarder of rib below
What is the actions of external intercostal muscles?: aid in inspiration (elevate ribs;
increase thoracic volume)
What is the innervation of the external intercostal muscles?: intercostal nerves
Where are the internal intercostal muscles located?: within intercostal spaces from pos-
terior thorax to sternum
What are the attachments of the internal intercostal muscles?: inferior border of rib
or costal cartilage above and superior boarder of rib or costal cartilage below
What is the action of the interosseous part of internal intercostal muscles?: aid
in expiration (depresses rib; decrease thoracic volume)
1/2
, What is the action of the interchondral part of internal intercostal muscles?: aid
in inspiration (elevate costal cartilage; increase thoracic volume)
What is the innervation of the internal intercostal muscles?: intercostal nerves
Where is the innermost intercostal muscles located?: within lateral intercostal spaces
What are the attachments of the innermost intercostal muscles?: inferior boarder
of rib above and superior boarder of rib below
What is the action of the innermost intercostal muscles?: aid in expiration (depresses
ribs; decrease thoracic volume)
What is the innervation of the innermost intercostal muscles?: intercostal nerves
What are the attachments of the subcostal muscles?: inferior boarder of ribs near angles
and superior boarder of 2nd and 3rd rib inferior
What is the action of the subcostal muscles?: depresses ribs
What is the innervation of the subcostal muscles?: intercostal nerves
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