Osteology MD4

Question 1

Answer 1

• the Inferior Thoracic Aperture/Thoracic Outlet forms the superior boundary of the abdominal cavity
• it is lined/closed by the diaphragm
• it is composed of the:

1. xiphisternal junction
2. costal margin (costal cartilages of ribs 7-10)
3. T12 vertebra, 11 & 12th ribs

Question 2

Answer 2

Anterior Superior Iliac Spine (ASIS)

• attachment of inguinal ligament
• McBurney’s point: 1/3 distance from ASIS to umbilicus = base of appendix, tenderness = appendicitis

Pubic Symphysis

• cartilaginous joint b/w superior pubic rami
• anterior to bladder
• attachment for suspensory lig. of penis

Iliac Crest

Iliac Tubercle

• prominence on the external lip of the iliac crest, 5 cm posterior to ASIS
• marks the widest point of the iliac crest
• imaginary line connecting the left and right iliac tubercles forms the transtubercular plane, level of L5 vertebra
• origin for the iliotibial tract/IT band

Answer 3