Pelvis Ligaments

Question 1

Sacroiliac Ligaments (4)

Answer 1

• Anterior sacroiliac ligament
• posterior sacroiliac ligament
• interosseous sacroiliac ligament
• iliolumbar ligament

Question 2

Function of Sacroiliac ligaments

Answer 2

Stabilization: prevent excessive movement between the bones

Question 3

Anterior Sacroiliac Ligament

Answer 3

Attachment: anterior surface of the sacrum to the anterior surface of the ilium (pelvic bone)

Function: Provides stability to the sacroiliac joint, preventing excessive movement between the sacrum and ilium.

Question 4

Posterior Sacroiliac Ligament

Answer 4

Attachment: posterior surface of the sacrum to the posterior surface of the ilium

Function: Helps reinforce the sacroiliac joint posteriorly, limiting excessive movement, particularly during walking and standing. Involved in transferring weight of upper body to lower body

Question 5

Interosseous Sacroiliac Ligament

Answer 5

Attachment Sites: Located between the sacrum and the ilium, deep to the posterior sacroiliac ligament.

Function: The strongest ligament in this group, providing significant stability to the sacroiliac joint by limiting the separation of the sacrum and ilium.

Question 6

iliolumbar Ligament

Answer 6

Attachment Sites: connects the transverse processes of the L5 vertebra (sometimes L4) to the posterior portion of the iliac crest.

Function: Stabilizes the lumbosacral junction and prevents excessive movement of the lumbar spine relative to the sacrum. It also helps resist lateral movement of the sacrum.

Question 7

Pubic Ligaments (2)

Answer 7

• Superior Pubic Ligament
• Inferior Pubic Ligament

Question 8

Function of Pubic Ligaments

Answer 8

Support: provide support to the pelvic organs, maintain alignment of the pelvis

Question 9

Superior Pubic Ligament

Answer 9

Attachment: superior aspects of the pubic bones across the midline, running from one pubic symphysis to the other.

Function: Supports the pubic symphysis and resists any shearing forces that could cause the pubic bones to move apart.

Question 10

inferior pubic ligament

Answer 10

Attachment: runs beneath the pubic symphysis, connecting the inferior aspects of the pubic bones.

Function: Provides additional support to the pubic symphysis and resists forces attempting to separate the pubic bones

Question 11

“Sacro” ligaments (2)

Answer 11

• Sacrotuberous
• Sacrospinous ligament

Question 12

Function of “sacro” ligaments

Answer 12

Limiting Movements: restrict excessive motion of sacrum, promote stability

Question 13

Sacrotuberous Ligament

Answer 13

Attachment: the posterior surface of the sacrum (from the sacrum and coccyx) to the ischial tuberosity (a bony prominence on the pelvis).

Function: Limits the forward tilting (nutation) of the sacrum and stabilizes the sacroiliac joint by preventing excessive motion. It also helps form the greater sciatic foramen by its attachment points.

Question 14

Sacrospinous Ligament

Answer 14

Attachment: connects the sacrum (particularly the lateral aspects of the sacrum and coccyx) to the ischial spine.

Function: Limits excessive movement of the sacrum and restricts its rotation, preventing over-rotation of the sacroiliac joint. Like the sacrotuberous ligament, it helps form the greater and lesser sciatic foramina.