| Term | Definition |
|---|
| Left and right hypochondriacvregion | If one were to divide the abdomen into 9 segments, these segments would be lateral, both left and right, to the epigastric region and superior to the subcostal plane. They are sometimes called hypochondrium. |
| External abdominal oblique muscle | This is the superficial layer of abdominal muscle at the midaxillary line. Its fibers are oblique, directed inferiorly as they approach the anterior midline. It is continuous with the external intercostal muscle. Enter Hint |
| Transverse abdominis muscle | This is the deep layer of abdominal muscle at the midaxillary line. Its fibers are primarily transverse as they approach the anterior midline. It is continuous with the innermost intercostal muscle. |
| Internal abdominal oblique muscle | This is the intermediate layer of abdominal muscle at the midaxillary line. Its fibers are oblique, directed superiorly as they approach the anterior midline. It is continuous with the internal intercostal muscle. |
| Rib 10, midaxillary, left and right | This is the level where the diaphragm meets the thoracic wall along the midaxillary line. |
| Lumbar vertebra 3 body | This structure is important because the subcostal plane runs through it. This is one of the planes used to divide the abdomen into nine regions. |
| Transpyloric line (TPL) | This landmark is a transverse plane at the level of lumbar 1 vertebral body and where rib 9 intersects the lateral boundary of the rectus abdominis muscle. It is superior to the subcostal plane and runs through the left and right hypochondriac regions as well as the epigastric region. It is of anatomical significance because MOST organs at or above this plane are protected to some degree by the ribs. |
| external inguinal ring | This feature is an opening through the aponeuroses of the inguinal ligament. It is positioned medial and inferior to the internal inguinal ring, which makes the structure stronger than if they were lined up opposite each other. |
| left and right lumbar regions | If one were to divide the abdomen into 9 segments, these segments would be inferior to the subcostal plane and superior to the intertubercular plane. They are lateral, both left and right, to the umbilical region. They are sometimes called the flank. |
| 4 segments on each side | This describes the anatomy of the rectus abdominis muscle. |
| Internal inguinal ring | This feature is an opening into the inguinal canal on the deep side of the inguinal ligament. It is positioned lateral and superior to the external inguinal ring, which makes the structure stronger than if they were lined up opposite each other. |
| Lumbar vertebra 1 body | This structure is important because the transpyloric line runs through it. This is the plane at the inferior border of the abdominal volume that is mostly protected by the ribs. |
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