MUSCLES

Question 1

forms much of anterior body wall; extends from xiphoid to pubic symphosis; responsible for the refraction/”ghosting” artifact occasionally sen while imaging the midline pelvis in the transverse plane

Answer 1

rectus abdominus

Question 2

originates from the lower thoracic and lumbar vertebrae; courses laterally and anterior through abdomen; below the level of iliac crest, fibers of the psoas major begins to merge with fibers from medial aspect of iliacus muscle

Answer 2

psoas major

Question 3

inserts on the lesser trochanter of the femur

most likely to be mistaken for an ovary sonographically

Answer 3

iliopsoas

Question 4

arises from the iliac crest and extends inferiorly until it merges with the psoas major; forms part of the lateral margins of the pelvic basin

Answer 4

iliacus

Question 5

triangular sheet of muscle anchored along the brim of the true pelvis; extends posteriorly and medially along the side of the wall of the true pelvis, passing beneath the elevator ani to exit through the lesser sciatic foramen and insert on the greater trochanter

Answer 5

obturator internus

Question 6

located deeply posterior in the true pelvis; less routinely imaged due to its deep location

Answer 6

pirifomis

Question 7

composed of the coccyges and levator ani

functions tp resist increase intra-abdominal pressure; resist gravity

Answer 7

pelvic diaphragm

Question 8

forms the posterior pelvic floor

Answer 8

coccygeus

Question 9

consists of iliococcygeus, pubococcygus, and puborectalis
located between the pubis and coccyx
forms the anterior/middle pelvic floor

Answer 9

levator ani group