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level: Muscles of thorax & abdominal wall

Questions and Answers List

Question	Answer
Origin:Cervical vertebrae Insertion:First and second ribs Action:Inspiration,elevates ribs	Scalenes
Origin:inferior edge of each rib Insertion:Superior edge of next rib below origin Action:Inspiration,elevate ribs	external intercostals
Origin:Superior edge of each rib Insertion:Inferior edge of next rib below origin Action:Forced expiration,depress ribs	Internal Intercostals
Origin:Inferior ribs,sternum,and lumbar vertebrae Insertion:Central tendon of diaphragm Action:Inspiration,depress floor of thorax	Diaphragm
Origin:pubic crest and pubic symphasis Insertion:xiphoid process and inferior ribs Action:Flexes vertebral column,compresses abdomen (ABS)	Rectus abdominis
Origin:Ribs 5-12 Insertion:Iliac crest,inguinal ligament and fascia of rectus abdominis Action:Compresses abdomen,flexes and rotates vertebral column	External abdominal oblique
Origin:Iliac crest,inguinal ligament,and lumbas fascia Insertion:Ribs 10-12 and fascia of rectus abdominis Action:Compresses abdomen,flexes and rotates vertebral column	Internal abdominal oblique
Origin:Costal cartilages 7-12,lumbar fascia,iliac crest and inguinal ligament Insertion:Xiphoid process,fascia of rectus abdominis,and pubic tubercle Action:Compresses abdomen	Transversus abdominis