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Anatomy Chapter 7G: Pelvic Girdle


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Bony Pelvis
Coxal bones/os coxae, sacrum, coccyx
Pelvic Girdle
Structure which attaches the lower limbs to the axial skeleton. Formed by the coxal bones.
Os Coxae/Coxal Bone
"Hip bones." The pair of hip bones articulate with each other anteriorly and with the sacrum posteriorly.
Large, lateral, hemispherical socket formed at the point of fusion of the ilium, ischium, and pubis where the head of the femur articulates.
Large, flaring bone that forms the superior region of the coxal bone.

Articulates with the sacrum and is fused with the pubis and ischium at the acetabulum.

Contains the body, ala, iliac crest, tubercle of the iliac crest, anterior superior iliac spine, posterior superior iliac spine, anterior inferior iliac spine, anterior inferior iliac spine, greater sciatic notch, gluteal surface, posterior gluteal line, anterior gluteal line, inferior gluteal line, iliac fossa, auricular surface, arcurate line, and pelvic brim.
Body of the Ilium
Main portion of the ilium, inferior to the ala.
Superior winglike portion of the ilium. Actual "hips."
Iliac Crest
Thickened superior margin of the ala.
Tubercle of the Iliac Crest
Thickest point of the iliac crest, visible as a bump at the apex of the ala from the lateral perspective.
Anterior Superior Iliac Spine
Protrusion which ends the iliac crest anteriorly.

Attachment point for muscles.
Posterior Superior Iliac Spine
Sharp projection which terminates the iliac crest posteriorly.

Attachment point for muscles.
Anterior Inferior Iliac Spine
Protrusion located inferior to the anterior superior iliac spine and superior to the acetabulum on the anterior aspect of the ilium.

Attachment point for muscles.
Posterior Inferior Iliac Spine
Large, curving projection just inferior to the posterior superior iliac spine and superior to the greater sciatic notch on the posterior aspect of the ilium. Forms the upper curve of the greater sciatic notch.

Attachment point for muscles.
Greater Sciatic Notch
Deep indentation in the ilium just inferior to the posterior inferior iliac spine / posterior to the acetabulum.

Passage point for the sciatic nerve to enter the thigh.
Gluteal Surface
Broad posterolateral surface of the ilium.
Anterior Gluteal Line
Large arcing line which crosses the main section of the gluteal surface horizontally.

Gluteal muscle attachment site.
Posterior Gluteal Line
More-or-less vertical line running down the posterior side of the gluteal surface, from the iliac crest to the greater sciatic notch.

Attachment site for gluteal muscles.
Inferior Gluteal Line
Horizontal line on the inferior portion of the gluteal surface which more-or-less mirrors the arc of the acetabulum superiorly.

Gluteal muscles attach here.
Iliac Fossa
Concavity of the internal surface of the iliac ala.
Auricular Surface
Roughened surface posterior to the iliac fossa. Horizontally elongated, concave depression where the ilium articulates with the sacrum, forming the sacroiliac joint.
Arcuate Line
Ridge running inferiorly/anteriorly from the auricular surface down to the superior ramus of the pubis.

Helps define the pelvic brim.
Bone that forms the posteroinferior part of the os coxae. Roughly arc-shaped and includes a portion of the acetabulum.

Fuses with the ilium and the pubis at the acetabulum.
Body of the Ischium
Main portion of the ischium, abutting the acetabulum.
Ischial Ramus
Thinner, inferior branch of the ischium which makes up the lateral part of the loop which forms the obturator foramen.
Ischial Spine
Sharp bump on the ischial body which projects medially into the pelvic cavity.

Serves as a point of attachment for the sacrospinous ligament from the sacrum.
Lesser Sciatic Notch
Notch just inferior to the ischial spine.

Serves as passageway for a number of nerves and blood vessels to the anogenital area.
Ischial Tuberosity
Rough, thickened portion of the inferior surface of the ischial body. Inferior to the lesser sciatic notch.

Bears our weight when sitting. Attachment site of a ligament which runs to the sacrum.
Anterior portion of the hip bone.

Fuses with the ilium and the ischium at the acetabulum and articulates with its pair at the pubic symphysis.
Superior Ramus
Upper bar issuing from the pubic body, forming the superior medial portion of the loop around the obturator foramen.
Inferior Ramus
Lower bar which extends from the body of the pubis, making up the inferior medial portion of the loop around the obturator foramen.
Pubic Body
Central portion of the pubis from which the rami project.
Pubic Crest
Outward flaring of bone of the anterior border of the pubis, lateral to the pubic symphysis.
Pubic Tubercle
"Bump" or "angle" at the lateral end of the pubic crest.

Attachment site for the inguinal ligament.
Obturator Foramen
Large opening in the hip bone defined by the rami of the pubic bone and the ramus of the ischium.

Passageway for blood vessels and nerves, largely closed by a fibrous membrane.
Pubic Symphysis
Medial joining of the two pubic bones by a fibrocartilage disc.
Pubic Arch
Inverted V (male, narrower/longer) or U (female, wider/shorter) shape just inferior to the pubic symphysis.
Sacroiliac Joint
Articulation point of the sacrum with the auricular surface of the ilium.
Male vs. Female Pelvis (Female characteristics defined)

Pelvic brim is larger/more circular.

Pelvis is shallower with lighter/thinner bones.

Sacrum is broader, shorter

Pubic arch is more rounded/wider.

Acetabula are smaller and farther apart.

Ilia flare more laterally.

Ischial spines are shorter and farther apart, enlarging the pelvic outlet.

Pelvis is tilted further forward.

Coccyx is less curved, more movable

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