Lecture 16, Sacrum

Question 1

Sacrum

Answer 1

formed by the fusion of five, originally separate vertebrae and is located at the base of the lumbar vertebrae connecting to the pelvis

Question 2

Ala

Answer 2

large triangular surface on either side of the sacral base, continous with the iliac fossa

Question 3

Promontory

Answer 3

projecting anterior edge of the body of the first sacral vertebrae

Question 4

Anterior sacral foramina

Answer 4

openings in the sacrum on anterior side (holes) through which the anterior divisions of the sacral nerves and the lateral sacral arteries pass

Question 5

Lateral mass

Answer 5

part of the bone formed by the expanded transverse processes and the vestiges of the sacral ribs

Question 6

Auricular surface

Answer 6

forms the sacral contribution to the articulation between the sacrum and os coxae

Question 7

Median crest

Answer 7

formed by the fused spinous processes

Question 8

Intermediate crest

Answer 8

formed by the fused articular processes

Question 9

Lateral crest

Answer 9

formed by the fused tips of the transverse processes

Question 10

Sacral hiatus

Answer 10

inverted U-shaped, comes to be from the absence of the laminae and spinous processes of the S4 & S5 vertebrae