CSD-2260 Lecture 9: Lecture 9 9/20/16

• School: App State
• Department: Communication Sciences and Disorders
• Course: CSD-2260
• Professor: Jennifer Dalton

Document Summary

Lecture 9: points of origin and insertion of the muscles are based on speech mechanisms, thoracic muscles of expiration- function is to depress rib cage. Innermost intercostals: origin: superior margin of ribs 1 through 11, insertion: inferior surface of rib above. Subcostals: origin: inner posterior thorax, insertion: inner surface of second or third rib below. Serratus posterior inferior: origin: spinous process of t11, t12, l1 through l3, insertion: lower margin of ribs 7 through 12. Origin: posterior abdominal wall at the vertrbal column via the thoracolumbular fascia of the abdominal aponeurosis. Insertion: transversus abdominis aponeurosis and inner surface of ribs 6 through 12: internal oblique abdominis. Insertion: cartilaginous portion of lower ribs and the portion of the abdominal aponeurosis lateral to the rectus abdominis: external oblique abdominis. Origin: osseous portion of the lower seven ribs. Insertion: iliac crest, inguinal ligament, and abdominal aponeurosis lateral to rectus abdominis: rectus abdominis. Origin: originates as four or five segments at pubic inferiorly.