16 External lip of the iliac crest. Labium exter-num. Bony ridge for attachment of the external abdominal oblique muscle. A
17 Tubercle of iliac crest. Tuberculum iliacum. Palpable projection on the external lip of the iliac crest about 5 cm behind the anterior iliac spine at the junction of the anterior gluteal line with the iliac crest. A
18 Linea intermedia. Rough bony area between the external and internal lips of the iliac crest. Origin of the internal abdominal oblique muscle. A
19 Internal lip of the iliac crest. Labium internum. Bony ridge on the inner margin of the iliac crest for attachment of the transversus abdom-inis muscle. A C
20 Anterior superior iliac spine. Spina iliaca anterior superior. Bony projection marking the anterior limit of the iliac crest. Origin of the sar-torius muscle. A C
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.