Sacrum Flashcards
1
Q
Shape
A
Triangular bone
2
Q
Parts
A
Fusion of 5 sacral vertebrae:
1. Base
2. Apex
3. Anterior surface
4. Posterior surface
5. Lateral surface
3
Q
Base
A
- Formed of:
- S1 vertebra body
- Sacrum alae - It articulates with L5 vertebra
4
Q
Base contents
A
- Sacral promontory
- Sacral Ala
5
Q
Sacral promontory
A
Anterior projecting edge of S1 vertebra
6
Q
Sacral Ala
A
Related to lumbo-sacral trunk
7
Q
Apex
A
- S5 vertebra lower surface
- Articulates with coccyx
8
Q
Anterior surface
A
- Smooth
- Concave
- Has 4 pairs of anterior sacral foramina for passage of upper 4 sacral nerves ventral rami and lateral sacral vessels
