Midterm Flashcards
(36 cards)
Describe the locations of ilium, ischium, and pubis
Ilium: superior
Ischium: inferior and posterior
Pubis: inferior and anterior
What is the difference between a true and accessory ligament
True: bone to bone
Accessory: bone to another ligament
Where does the iliolumbar ligament run?
From ilia to 5th lumbar vertebra
Where does the sacrospinous ligament run?
From sacrum to spine of ischium
Where does the sacrotuberous ligament run?
From sacrum to ischial tuberosity
What is the function of the iliolumbar ligament
Stabilizes L5; restricts anterior and rotary motion of L5
What ligament is part of the coccygeus m?
Sacrospinous
What muscle attaches to the sacrotuberous m?
Gluteus Maximus and tendon of biceps femoris
What are the parts of the sacroiliac ligament?
Anterior: 3rd sacral segment to lateral preauricular surface
Interosseous: between upper parts of the joint
Dorsal: lateral sacral crest to PSIS and iliac crest
What kind of joint is pubic symphysis
Secondary cartilaginous; fibrocartilage
What are the major hip flexors
Iliacus (ala to lesser trochanter) and psoas (5th vertebrae to lesser trochanter) (minor: rectus femoris and sartorius)
What are the hip extensors?
Hamstrings and gluteus Maximus
Where do the adductors attach?
Pubic ramus and medial aspect of femur
What do adductors limit
Lateral movement of pelvis
What are the abductors?
Gluteus medius and minimus (attach to ilium and greater trochanter) and tensor fascia latae
What are the external rotators?
Obturator internus/externus, piriformis, gemellus superior and inferior, quadratus femoris
Where do the external rotators attach
Greater trochanter
When is the function of the piriformis an internal rotator vs external
Internal: when flexed
External: when extended
What is the only rotator that attaches directly to the sacrum
Piriformis
Where does the dura attach to the sacrum
2nd sacral segment
What kind of joint is the SI joint
Diarthrodial; unlike other joints because has hyaline and fibrocartilage
When is the long dorsal SI ligament stretched
Backward torsions, extensions, pregnancy
What do the sacrospinous and sacrotuberous ligaments prevent
Limit posterior and superior rotation of the sacral apex around the transverse axis
What is the “self-locking mechanism”
Form closure: shape and characteristics of SI joint resist shear
Force closure: compression produced by body weight, muscle, and ligament force prevents shear
