Sacrum

Question 1

promontory

Answer 1

anterior midline projection of the sacral plateau

Question 2

sacral plateau

Answer 2

the flat, anterosuperiorly inclined surface of the sacrum that articulates with the terminal or most inferior lumbar vertebra

Question 3

alae (wings)

Answer 3

sweep laterally from the first sacral element

Question 4

sacroiliac joint (auricular surface)

Answer 4

the articulation between the sacrum and the os coxae

Question 5

anterior (pelvic) sacral foramina

Answer 5

openings in the concave anterior surface of the sacrum

Question 6

transverse lines

Answer 6

horizontal ridges on the concave anterior sacral surface that mark the edges of the fused sacral vertebrae

Question 7

superior articular facets

Answer 7

articulate with faces on the inferior articular processes of the most inferior lumbar vertebra

Question 8

dorsal wall

Answer 8

rough, irregular, variable plate of bone made up of the ossified laminae and articular processes of the fused sacral vertebrae

Question 9

median crest (spine)

Answer 9

highly variable midline projection of the dorsal wall composed of fused spines of the sacral vertebrae

Question 10

Siding: fragmentary parts

Answer 10

anterior sacral surface is smooth and concave, with transverse lines
the size of the sacral vertebrae diminished inferiorly
the auricular (sacroiliac) surfaces lateral and the apex of this V-shaped feature is anterior