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CHP8 Skeletal; Lower Extremity Bones and Their Markings; Coxal

Coxal Large hip bone (pelvic bone); with the sacrum and coccyx, forms the basinlike pelvic cavity; lower extremities attached to the axial skeleton by the coxal bones
Ilium Upper, flaring portion
Ischium Lower, posterior portion
Pubis Medial, anterior section
Acetabulum Hip socket; formed by the union of the ilium, ischium, and pubis
Iliac crests Upper, curving boundary of the ilium
Anterior superior (re: iliac spines) Prominent projection at the anterior end of the iliac crest; can be felt externally as the "point" of the hip
Anterior inferior (re: iliac spines) Less prominent projection short distance below anterior superior spine
Posterior superior (re: iliac spines) At the posterior end of the iliac crest
Posterior inferior (re: iliac spines) Just below the posterior iliac spine
Greater sciatic notch Large notch on the posterior surface of the ilium just below the posterior inferior spine
Ischial tuberosity Large, rough, quadrilateral process forming the inferior part of the ischium; in an erect sitting position the body rests on these tuberosities
Ischial spine Pointed projection just above tuberosity
Pubic symphysis Cartilaginous, amphiarthrotic joint between pubic bones
Superior pubic ramus Part of the pubis lying between the symphysis and acetabulum; forms the upper part of the obturator foramen
Inferior pubic ramus Part extending down from the symphysis; unites with the ischium
Pubic arch Curve formed by the two inferior rami
Subpubic angle Angle formed under the inferior pubic rami; generally larger in women than in men
Pubic crest Upper margin of superior ramus
Pubic tubercle Rounded process at the end of the crest
Obturator foramen Large hole in the anterior surface of the coxal bone; formed by the pubis and ischium; largest foramen in the body
Pelvic inlet (or brim) Boundary of aperture leading into true pelvis; formed by pubic crests, iliopectineal lines, & sacral promontory; size & shape of inlet have obstetrical importance cuz if any of its diameters are too small, infant's skull cannot enter true pelvis for birth
True pelvis (or lesser pelvis) Space below the pelvic brim; true "basin" with bone and muscle walls and a muscle floor; pelvic organs located in this space
False pelvis (or greater pelvis) Broad, shallow space above the pelvic brim, or the pelvic inlet; name "false pelvis" is misleading because this space is actually part of the abdominal cavity, not the pelvic cavity
Pelvic outlet Irregular circumference marking the lower limits of the true pelvis; bounded by the tip of the coccyx and two ischial tuberosities
Pelvic Girdle (or bony pelvis) Complete bony ring; composed of two hip bones (ossa coxae), the sacrum, and the coccyx; forms a firm base by which the trunk rests on the thighs and for attachment of the lower extremities to the axial skeleton
Created by: Jgiron6994



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