PHTY101 Lecture 10: PHTY 101 – WEEK 10
Document Summary
Topic 10: muscles of the back, neck and abdomen. Origin: xiphoid process, costal cartilages of ribs 5,6,7. Enclosed front and back by rectus sheath- fused in midline to attach to linea alba: external abdominal oblique: Origin: outer border lower 8 ribs and costal cartilages. Lower edge is free and forms the inguinal ligament. Origin: lower border lower 4 ribs and costal cartilages. Lower edge joins to inguinal ligament: transverse abdominus: Origin: inner surface of costal cartilages of lower 6 ribs. Action: raises intra-abdominal pressure: quadratus lumborum: Origin: lower border rib 12, transverse processes of l1-l5. Back muscles: erector spinae group, vertical sheet, superficial, extends length of vc, attaches inferiorly to: Spinous processes and supraspinous ligaments t11 l5. Single belly in lumbar region, which divides into 3 parallel columns- iliocostalis, longissimus, spinalis. Iliocostalis: lateral column of erector spinae, attaches to angles of ribs, extends and ipsilaterally flexes trunk and neck, divided into 3 parts:
