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ilium - Coggle Diagram

- - - - Curvatures:
        
        Vertically it is convex upwards,
        
        anteroposteriorly, it is concave inwards
        in front and concave outwards
        behind.
        
        The highest point of the iliac crest is situated a
        little behind the midpoint of the crest.
        
        It lies at the
        level of the interval between the spines of
        vertebrae L3 and L4.
        
        Ends:
        
        ASIS
        
        The anterior end of the iliac crest is called the
        anterior superior iliac spine (ASIS).
        This is a prominent landmark that is easily felt in the living.
        
        PSIS
        
        The posterior end of the crest is called the posterior
        superior iliac spine.
        Its position on the surface of
        the body is marked by a dimple
        5 cm lateral of the second sacral spine (S2).
        
        Morphological divisions:
        
        long ventral segment
        
        forms more than the anterior
        two-thirds of the crest. it has an:
        
        outer lip,
        
        an inner lip, and an
        
        intermediate area.
        
        The tubercle of the iliac crest
        is an elevation that lies on the outer lip
        about 5 cm behind the ASIS
        
        short dorsal segment.
        
        forms less than the posterior
        one-third of the crest. It has:
        
        a lateral and a medial
        slope separated by a ridge.
  - - - starts at the ASIS and runs downwards to the acetabulum.
        
        ends in the AIIS
        anterior inferior iliac spine
        
        The lower half is large, triangular and rough.
      - Posterior Border
        
        Begins at the posterior superior iliac spine
        (P.S.I.S)
        
        And ends at the posterior inferior iliac spine
        (P.I.I.S)
        posterior inferior iliac spine.
        
        Still lower down the posterior border is marked by a large deep notch called the
        greater sciatic notch.
        
        Medial Border
        
        Medial border extends on the inner or pelvic surface of the ilium from the iliac crest to the iliopubic eminence.
        
        It separates the iliac fossa from the sacropelvic
        surface.
        
        Its lower rounded part forms the iliac parts of the
        arcuate line or inlet of pelvis.
  - - - is the outer surface of the ilium,
        
        which is convex in front and
        
        concave behind, like the iliac crest.
        
        is divided into 4 areas by three gluteal lines.
        
        posterior gluteal line
        
        the shortest,
        
        begins 5 cm in front of the PSIS,
        
        and runs downwards to end at upper part of greater sciatic notch.
        
        anterior gluteal line,
        
        the longest,
        
        begins about 4 cm behind the ASIS
        
        runs backwards and then downwards to end at the middle of the upper border of the greater sciatic notch.
        
        inferior gluteal line
        
        the most ill-defined,
        
        begins a little above and behind the AIIS
        
        runs backwards and downwards to end near
        the apex of the greater sciatic notch.
      - iliac fossa
        
        is the large concave area on the inner
        surface of the ilium,
        situated in front of its medial border.
        
        It forms the lateral wall of the false pelvis.
        
        Sacropelvic Surface
        
        is the uneven area on the inner
        surface of the ilium, situated behind its medial
        border.
        
        It is subdivided into three parts;
        the iliac tuberosity,
        the auricular surface and the pelvic surface.
        
        auricular surface
        
        articular but pitted.
        
        It lies anteroinferior to the iliac tuberosity.
        
        It articulates with the sacrum to form the sacroiliac joint.
        
        pelvic surface
        
        is smooth and lies anteroinferior
        to the auricular surface.
        
        It forms a part of the
        lateral wall of the true pelvis.
        
        Along the upper border of the greater sciatic notch,
        this surface is marked by the preauricular sulcus.
        
        The iliac tuberosity
        
        is the upper, large, roughened
        area, lying just below the dorsal segment of the
        iliac crest.
        It is raised in the middle and depressed
        both above and below.