Ch. 8 Pelvic Gridle Flashcards Preview

Human Anatomy > Ch. 8 Pelvic Gridle > Flashcards

Flashcards in Ch. 8 Pelvic Gridle Deck (25):
1

Functions

- sacrum, coccyx, and right and left ossa coxae
- protects and supports the viscera in inferior part of ventral body cavity
- pelvic girdle and associated ligaments support weight of the body from vertebral column
- pelvic girdle refers to left and right ossa coxae only

2

Skeleton of Lower Limb

- skeleton of lower limb consists of two separate regions
1. single pelvic girdle
2. free part

3

Pelvic Hip Girdle

- each coxal bone consists of 3 bones that fuse together; illium, ischium, and pubis
- 2 coxal bones are joined anteriorly by the pubic symphysis (fibrocartilage)
- joined posteriorly by sacrum forming sacroilliac joints

4

Illium

- largest
- superior part of hip bone
- superior ala, and inferior body which forms the acetabulum (socket for head of femur)
- superior border- iliac crest
- hip pointer- occurs at anterior superior illiac spine
- greater sciatic notch- allows passage of sciatic nerve

5

Ischium and Pubis

ischium: inferior and posterior part of hip bone
- most prominent feature is ischial tuberosity; part that meets the chair when you are sitting
pubis: inferior and anterior part of hip bone
- superior and inferior rami and body

6

False and True Pelves

Pelvic brim: ilne from sacral promontory to upper part of the pubic symphysis
false pelvis: lies above the this line
- contains no pelvic organs except uniary bladder and uterus during pregnancy
true pelvis: bony pelvis inferior to pelvic brim, has an inlet, an outlet and a cavity; contains sex organs
pelvic axis: path of baby during bith

7

Male VS Female Pelves

males:
- larger and heavier
- pelvic inlet is smaller and heart shaped
- pubic arch is less than 90
females:
- wider and shallower
- pubic arch is greater than 90
- more space in true pelvis

8

Muscles that Move The Coxal Joint

- originate from pelvic girdle and vertebral column
- insert on various places on the femur
- stabilize the hip joint; provide support for body during locomotion
- most are massive muscles
- divided into anterior, posterior and medial groups

9

Muscles the Move the Thigh (anterior, posterior, medial and lateral)

Anterior (flexor): illiacus, psoas major, sartorius, rectus femoris
Posterior Gluteal (extensor, abductors, rotators): gluteus maximus, medius and minimus
Medial or Adductor: adductor mangus, adductor longus, adductor brevis, gracillis, pectineus
Lateral: tensor fascie latae

10

Deep lateral thigh rotators

5-6 lateral rotator muscles of hip joint over the posterior aspect of the hip
1. Piriforms
2&3. sup. and inferior gemelis
4. Obturator interneus
5. Obturator externus
6. Quadratus femoris
- all these muscles are rotators and abductors that rotate thigh laterally

11

Illiacus

-iliac fossa of sacrum
- lesser trochanter of femur
- flexes and rotates thigh laterally

12

Psoas Major

- major and minor from lumbar vertebrae
o: transverse process and body of lumbar vertebrae
i: lesser trochanter
- flexes and rotate thigh laterally

13

Sartorius

o: anterior superior illiac spine
i: medial surface of body of tibia
- longest flexor and rotator muscle of the thigh, flexes, abduct and rotates leg medially

14

Rectus Femoris

o: anterior inferior illiac spine
i: tibial tuberosity
- extends and flexes thigh as a hip joint

15

Gluteus Maximus

- has extensive attachments
- forms roundness of buttock
- powerful hip extensor and lateral rotator

16

Gluteus Medius and Minimus

- lie deeper and originate from illium
- abduct and medially rotate thigh at hip joint

17

Medial Group of Muscles

- most are adductors of the hip
- some aid in hip flexion
- common origion on pubic bone (inferior ramus, pectineal line or pubic crest)
- most insert on shaft of femur

18

Adductor Magnus

- largest and deep to other adductor
- some fibers arise from the pubis and ischium, and insert into femur
- adduct, rotate and extend thigh at hip joint

19

Adductor Longus

- near pubic symphasis area
- adducts, rotates, and flexes thigh at hip joint

20

Adductor Brevis

- located in ramus and body of pubis
- adducts, rotates, and flexes thigh

21

Gracilis

- medial muscle
- inserts on tibis and act to flex knee/leg

22

Pectineus

- originate from pectineal line of pubic ramus
- adducts and flexes thigh at hip joint

23

Tensor Fasciae Latae

o: iliac crest/spine
i: tibia by the way of iliotibial tract
- flexes and abducts thigh medially at hip joint

24

Innervation of Pelvic Girdle

- forms medial and lateral plantar nerves
- cutaneous innervation to calf of leg, plantar surface of foot
- motor innervation to posterior thigh and leg muscles and intrinsic muscles of foot

25

Innervation of Pelvic Girdle (Lumbar Plexus)

lumbar plexus
- femoral nerve- posterior division of lumbar plexus- innervates- anterior, lateral, and medial portion of the leg and foot
- obturator nerve- anterior division of lumbar plexus- innervates- innervates of medial and adductor muscles of the thigh