Os Coxae

Question 1

ilium

Answer 1

thin, blade-like portion superior to the hip socket

Question 2

ishium

Answer 2

massive, blunt, posteroinferior part of the bone that one sits on

Question 3

pubis

Answer 3

anterioinferior part of the bone that approaches the opposite os coxae in the middle

Question 4

acetabulum

Answer 4

laterally facing, hemispherical hollow that forms the socket of the hip which articulates with the head of the femur

Question 5

acetabular fossa (or notch)

Answer 5

the nonarticular surface within the acetabulum

Question 6

lunate surface

Answer 6

crescent-shaped articular surface within the acetabulum where the femoral head actually articulates

Question 7

iliac pillar (acetabula-cristal buttress)

Answer 7

the bony thickening or buttress, located vertically above the acetabulum on the lateral iliac surface
this pillar extends to the superior margin of the ilium

Question 8

iliac (cristal) tubercle

Answer 8

the thickening at the superior terminus of the iliac pillar

Question 9

iliac crest

Answer 9

superior boarder of the ilium

S-shaped when viewed superiorly

Question 10

gluteal lines

Answer 10

rough, irregular lines that demarcate the attachment of the gluteal muscles on the lateral surface of the ilium

Question 11

anterior superior iliac spine

Answer 11

located at the anterior end of the iliac crest

Question 12

anterior inferior iliac spine

Answer 12

blunt projection on the anterior boarder of the os coxae just superior to the acetabulum

Question 13

posterior superior iliac spine

Answer 13

the posterior terminus of the iliac crest

Question 14

posterior inferior iliac spine

Answer 14

is a sharp projection just posteroinferior to the auricular surface

Question 15

greater sciatic notch

Answer 15

is the wide notch just inferior to the posterior inferior iliac spine

Question 16

ischial spine

Answer 16

located just inferior to the greater sciatic notch

Question 17

lesser sciatic notch

Answer 17

the notch between the ischial spine superiorly and the rest of the ischium inferiorly

Question 18

ischial tuberosity

Answer 18

the blunt, rough, massive posteroinferior corner of the os coxae

Question 19

auricular surface

Answer 19

ear-shaped sacral articulation on the medial surface of the ilium

Question 20

iliac tuberosity

Answer 20

roughened surface just posterosuperior to the auricular surface

Question 21

preauricular sulcus

Answer 21

variable groove along the anteroinferior edge of the auricular surface

Question 22

iliac fossa

Answer 22

the smooth hollow on the medial surface of the iliac blade

Question 23

arcuate line

Answer 23

an elevation that sweeps anteroinferiorly across the medial surface of the os coxae from the apex of the auricular surface towards the pubis

Question 24

iliopubic (iliopectineal) eminence

Answer 24

marks the point of union of the ilium and the pubis just lateral to the arcuate line

Question 25

iliopubic (superior pubic) ramus

Answer 25

connects the pubic to the ilium at the acetabulum

Question 26

ishiopubic (inferior pubic) ramus

Answer 26

is the thin, flat strip of bone connecting the pubis to the ischium

Question 27

pubic symphysis

Answer 27

is the near-midline surface of the pubis where the two ossa coxa most closely approach

Question 28

obturator foramen

Answer 28

is the large foramen encircled by the two pubic rami and the ischium

Question 29

obturator groove (sulcus)

Answer 29

is the wide groove on the medial surface of the iliopubic ramus, at the superiolateral corner of the obturator foramen

Question 30

Siding: isolated pubic regions

Answer 30

the vental surface is rough, the dorsal is smooth and convex, the symphysis faces the midline and the superior pubic ramus is more robust than the inferior pubic ramus

Question 31

Siding: isolated ischial regions

Answer 31

the thicker ramus faces the acetabulum
the thinner ramus is therefore anteroinferior
the surface of the ischial tuberosity faces posterolaterally

Question 32

Siding: isolated iliac blades

Answer 32

the iliac pillar is lateral and is anteriorly displaces

the auricular surface and related structures are posterior and medial

Question 33

Siding: isolated iliac crest

Answer 33

the iliac tubercle is anterior and lateral and the lateral surface anterior to it is more concave than the surface posterior to it
the crest sweeps posteromeidally from this point until is reaches the level of the anterior edge of the auricular surface and turns laterally

Question 34

Siding: isolated acetabula

Answer 34

the acetabular notch is inferior and faces slightly anteriorly
the inferior end of the “c” made by the lunate surface is broader and more blunt than the superior end
the ischial ramus is posterior and the superior pubic ramus is anterior
the ilium is superior

Question 35

Siding: isolated auricular surface

Answer 35

the auricular surface is posterior on the ilium and faces medially
its apex points anteriorly and the roughened reface for the sacroiliac ligaments is posterosupeiror
the greater and lesser sciatic notches are posterinferior