Lower limb 1 - The gluteal region and hip joint Flashcards
What forms the pelvic girdle and what do they provide?
2 hip (innominate) bones and sacrum
provides - strong stable support for lower limbs
Where does each innominate bone articulate with the sacrum posteriorly?
at the sacra-ilio joint
Where does each innominate bone articulate with anteriorly?
pubic symphysis
Which 3 bones is the innominate bone derived from and what is the point where these 3 bones eventually fuse?
- ilium
- ischium
- pubic
acetabulum
What is the difference between a male and female pelvis?
Male
- pelvic inlet - heart shaped
- angle of 2 arms of pubic arch - small and acute
- ischial spines - project medially
Female - big enough to pass baby head
- pelvic inlet - circular
- angle of 2 arms of pubic arch - larger and obtuse
- ischial spines don’t project far medially
What type of cartilaginous joint is the pubic symphysis and what is it between?
secondary cartilaginous joint
between the 2 pubic bones
What is the articular surface of the pubic symphysis covered by and what is it connected by?
articular surface - hyaline cartilage
connected by - fibrocartilaginous disc
What are the functions of the pelvis?
- bear weight of the upper body when sitting and standing
- transferring weight from axial skeleton to lower appendicular skeleton when walking and standing
- provides attachments
- withstand forces of powerful muscles
STRONG
STABLE
SUPPORT WEIGHT
PROTECT ORGANS AND VESSELS
What is the pelvic girdle strengthened by?
ligaments attaching to the ischium of the innominate bone
- sacrotuberous ligament - ischial tuberosity
- sacrospinous ligament - ischial spine
What does the acetabulum of the innominate bone articulate with in order to form the hip joint?
head of femur
What type of joint is the hip joint?
strong
stable
ball and socket joint
What movements are possible at the hip joint and what are there corresponding myotomes?
flexion - L2,3
extension - L4,5
abduction - L5, S1
adduction - L1,2,3,4
lateral/external rotation - L5, S1
medial/internal rotation - L1,2,3
What are the structures that strengthen and stabilise the hip joint?
acetabular anatomy
fibrous capsule
ligaments - iliofemoral, pubofemoral, ischiofemoral
What are the superficial muscles of the gluteal region?
- gluteus maximus
- gluteus medius
- gluteus minimus
- tensor fascia lata
What is the iliotibial tract and what does it do?
thickening of fascia kata into a longitudinal band
stabalises knee during running