Ms. Bowman
 Pelvis
• Two innominates articulate with the sacrum to
form the sacroiliac joint
 Innominates formed by the fusion of the ilium,
ischium, and pubis
 8 bones in pelvis
 Sacrum




Coccyx
Ilium-2
Ischium-2
Pubic-2
 Support
the spine and trunk
 Transfer weight from trunk to lower limbs
 Attachment site for muscles of the trunk
and thigh
 Protection of the pelvic organs
 Hip
• Formed by the articulation of the femur and the
acetabulum of the pelvis
 Forms ball and socket joint
 Longest
and
strongest bone in the
body
 Articulates with the
tibia to form the knee
and the pelvis to form
the hip
 Significantly
less
moveable than
shoulder, but much
more stable
 Neck of the femur has
little blood supply
 Origin-
outer surface of ilium and
posterior surface of sacrum and coccyx
 Insertion- proximal posterior femur,
iliotibial band
 Action- extends and externally rotates
the hip
 Origin-
outer edge of iliac crest
 Insertion- iliotibial tract
 Action- flexes, abducts, and internally
rotates hip
 Origin-
proximal outer surface of ilium
 Insertion- lateral surface of greater
trochanter of femur
 Action- abducts hip, internal and external
rotation of the hip
 Origin-
middle outer surface of ilium,
below gluteus medius
 Insertion- anterior border of greater
trochanter of femur
 Action- abducts and laterally rotates hip
 Origin-
internal surface of sacrum
 Insertion- greater trochanter of femur
 Action- externally rotates hip, abducts
thigh
Origin- ischial tuberosity, proximal posterior
femur
 Insertion- semimembranosis:posterior medial
condyle of femur; semitendinosus: proximal
medial surface of shaft of tibia; biceps femoris:
head of fibula, lateral condyle of tiboa
 Action- knee flexion, hip extension

 Origin-
anterior part of pubic bone,
ischial tuberosity
 Insertion- medial side of femur
 Action- adduct and laterally rotate hip
 Origin-
distal margin of pubic bone
 Insertion- proximal medial surface of
shaft of tibia
 Action- adducts hip, flexes knee
 Origin-
anterior superior iliac spine
 Insertion- proximal medial tibia
 Action- flexes hip, externally rotates hip,
abducts hip, flexes knee,
 Origin-rectus
femoris: front part of ilium
vastus group: proximal shaft of femur
 Insertion- patella via patellar tendon
 Action- extends knee, flexes hip