Exam 2: ALL OIAI :)

External oblique origin

lower 8 ribs (interdigitates with the serratus anterior and latissimus dorsi)

External oblique insertion

iliac crest, rectus sheath via aponeurosis

External oblique action

tenses abdominal wall, aids in rotation of the trunk, aids in lateral flexion of the trunk, important in forced expiration

External oblique innervation

thoracoabdominal nerves, subcostal nerves

Internal oblique origin

iliac crest

Internal oblique insertion

costal margin (superiorly), rectus sheath via aponeurosis (anteriorly), pubic crest (inferiorly)

Internal oblique action

tenses abdominal wall, aids in rotation of the trunk, aids in lateral flexion of the trunk, important in forced expiration

Internal oblique innervation

thoracoabdominal nerves, subcostal nerve, L1

Transversus abdominis origin

iliac crest, fascia of the back, lower 6 costal cartilages

Transversus abdominis insertion

rectus sheath via aponeurosis

Transversus abdominis action

tenses the abdominal wall, aids in rotation of the trunk, aids in lateral flexion of the trunk, important in forced expiration

Transversus abdominis innervation

thoracoabdominal nerves, subcostal nerve, L1

Rectus abdominis origin

pubic crest, pubic symphysis

Rectus abdominis insertion

xiphoid process, costal cartilages of ribs 5-7

Rectus abdominis action

flexion of trunk

Rectus abdominis innervation

thoracoabdominal nerves, subcostal nerve

what is the origin of the diaphragm?

-periphery posterior to the xiphoid process-lower 6 ribs-posterior abdominal wall

what is the insertion of the diaphragm?

central tendon

what is the action of the diaphragm?

inspiration

what is the innervation of the diaphragm?

phrenic nerve