10 - Abdomen and Cavity Grays

10 - Abdomen and Cavity Grays - TheAbdomen...

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The Abdomen Surface Anatomy, Vessels, Muscles,  and Peritoneum
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Abdominopelvic Cavity Ventral body cavity – Thoracic – Abdominopelvic Abdominopelvic – Abdominal Liver Stomach Kidneys – Pelvic cavity Bladder Some reproductive organs Rectum  www.templejc.edu 
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Abdominopelvic  Cavity • Surrounded by the abdominal walls and pelvic  girdle • The two cavities are continuous • Most organs surrounded by a  peritoneal  cavity – Visceral peritoneum – Parietal peritoneum – Peritoneal cavity pg 254
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Abdominal Quadrants • 9 regions  • 4 quadrants – Draw “line” through  navel – Right upper quadrant – Left upper quadrant – Left lower quadrant – Right lower quadrant pg 268
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Surface Anatomy Anterior abdominal wall extends from costal margin to  inferior boundaries: – Iliac crest – Anterior superior iliac spine – Inguinal ligament – Pubic crest Superior boundary – Diaphragm  Central landmark – Umbilicus  Linea alba (white line) – Tendinous line – Extends from xiphoid process to pubic symphysis pg 383
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Muscles Function: – Help contain abdominal organs – Move trunk – Forced breathing – Increase intra-abdominal pressure Abdominal wall – Anterior (4) Innervated by intercostal nerves Continuous with layers of intercostal muscles Fibers of layers run in different directions for strength Ends in aponeurosis which contains rectus abdominis  muscle – Posterior (3) pg 276
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Anterior Abdominal Wall Muscles External oblique Origin Lower 8 ribs Insertion Aponeurosis to linea alba, pubic and iliac crest Function  Flex trunk, compress abdominal wall (together), Rotate trunk (separate  sides) Internal oblique   Origin Lumbar fascia, iliac crest, inguinal ligament Insertion  Linea alba, pubic crest, last 3-4 ribs, costal margin Function Same for external obliques pg 276, 277
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Anterior Abdominal Wall Transversus Abdominis – Origin Inguinal ligament, lumbar fascia, cartilage of last  6 ribs, iliac crest – Insertion Linea alba, pubic crest – Function Compress abdominal contents Rectus Abdominis   – Origin • Pubic crest, symphysis – Insertion  • Xiphoid process, costal cartilages of ribs 5-7 – Function  • Flex, rotate trunk, fix and depress ribs, stabilize pelvis, compress  abdomen pg 275 pg 276
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Posterior Abdominal Wall Iliopsoas Psoas major Origin Lumbar vertebrae, T 12 Insertion – Lesser trochanter of femur via iliopsoas tendon Function  – Thigh flexion, trunk flexion, lateral flexion Innervation – Ventral rami L1-L3 Iliacus Origin – Iliac fossa, ala of sacrum Insertion – Lesser trochanter of femur via iliopsoas tendon
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10 - Abdomen and Cavity Grays - TheAbdomen...

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