Body Wall and Cavity

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Body Wall and Cavity

• Abdominal Surface and underyling bones
• Muscular Wall and Hernias
• Peritoneum and Mesenteries
• Thorax Surface
• Ribs and Intercostal Muscles

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Bony Landmarks around Abdomen

• Iliac crest
• Anterior superior iliac spine (ASIS)
• Pubic crest
• Inguinal ligament
• Costal margin
• Xiphoid process

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Abdominal Wall from surface

• Rectus abdominus
• Linea alba
• Iliac crest

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Muscles of abdominal wall

• Rectus abdominus--vertical midline
• Three layers form tube
• External oblique (hands-in-pocket)
• Internal oblique (fibers perpendicular to
  external)
• Transverse abdominus (wraps around)

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Muscles of abdominal wall--details
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Abdominal muscular wall pressurizes abdomen

• When?
• Cough
• Sneeze
• Urinate
• Defecate
• Birth
• Lifting

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Inguinal hernia results because pressure finds
weak spot at inguinal canal
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Mesenteries, peritoneum--what is retroperitoneal?
(back to basic body plan)
board drawing
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Peritoneal vs Retroperitoneal
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THORAX SURFACE ANATOMY

• Student who cheated in anatomy lab counted
  own ribs
• Males and Females have same number of ribs (no,
  Eve wasnt formed from one of Adams)

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BONES

• STERNUM
• manubrium
• xiphoid process
• RIBS

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INTERCOSTAL MUSCLES
COSTAL ribs intercostal between the
ribs
Function in posture, respiration