KIN 100 - Pelvic Girdle (lecture 16) Flashcards
What does the pelvic girdle consist of
right and left hip bones and sacrum
Functions of the pelvic girdle
- Connect the lower limb to the axial skeleton
- Transfer weight from the axial skeleton to the lower limb during standing and walking
- Provide attachment site for strong muscles of the gluteal and abdominal regions
- Provide support for pelvic organs
What bones are fused to form the hip bone
- Ilium
- Ischium
- Pubis
What do the hip bones contribute to the formation of
acetabulum (socket for the head of the femur)
How many fused vertebrae forms the sacrum
5
Describe the sacral canal
continuation of the vertebral canal an contains the cauda equina
- sacral foramina on both sides allow nerves to exit the sacral canal
Cauda equina
bundle of spinal nerves that descends past the distal end of the spinal nerve
General structure of bony pelvis in males vs female
male: Thick and heavy
Female: Thin and Light
Pelvic inlet of bony pelvis in males vs female
Male: Heart shaped, narrow
Female: Oval and rounded, wide
Subpubic angle of bony pelvis in males vs female
Male: Narrow
Female: Wide
Greater sciatic notch of bony pelvis in males vs females
Male: Narrow, inverted V shape
Female: Wide, almost 90 degree
in standing position, what two structures lie in the same vertical plane when the pelvis is in anatomical position
ASIS and pubic symphysis
When the pelvis is in anatomical position, what does the pubic symphysis do
supports the weight of the bladder and other pelvic organs
What two ligaments resist the rotation of the sacroiliac joints (pelvis)
- Sacrotuberous ligament
- Sacrospinous ligament
What does the sacrum articulate with
Articulates with the right and left hip joints
What kind of joint is the sacrum classified as
Compound joint:
Anteriorly, it is considered synovial
Posteriorly, it is considered syndesmosis (less mobile)
What does the left and right pubic bones articulate at
at the pubic symphysis
What is in between the two pubic bones
fibrocartilaginous interpubic disc
What is the pubic symphysis joint reinforced by
superiorly and inferiorly by pubic ligaments
Describe the sacral plexus
sacral spinal nerves (S1-S5) exit the intervertebral foramina and their anterior rami form a plexus of nerves within the psoas major muscle
What are the terminal branches of the sacral plexus
- Superior gluteal nerve
- Inferior gluteal nerve
- Nerve to quadratus femoris
- Nerve to obturator internus
- Nerve to piriformis
- Sciatic nerve
How is the large sciatic nerve formed
The lumbosacral trunk unites with the S1, S2, S3 roots
How is the lumbosacral trunk formed
a large nerve that is formed by the L4 and L5 roots
