Organ Systems

The human body has 11 organ systems (fig. A.11) and an immune system, which is better described as a population of cells than as an organ system. These systems are classified in the following list by their principal functions, but this is an unavoidably flawed classification. Some organs belong to two or more systems—for example, the male urethra is part of both the urinary and reproductive systems; the pharynx is part of the respiratory and digestive systems; and the mammary glands can be considered part of the integumentary and female reproductive systems.

Protection, Support, and Movement

Integumentary system Skeletal system Muscular system

Internal Communication and Integration

Nervous system Endocrine system

Transverse System Striated Muscle
Figure A.9 Transverse Section Through the Abdomen. Shows the peritoneum, peritoneal cavity (with most viscera omitted), and some retroperitoneal organs.

Saladin: Anatomy & I Atlas A General I Text I © The McGraw-Hill

Physiology: The Unity of Orientation to Human Companies, 2003

Form and Function, Third Anatomy Edition

Omentum Anatomy

Diaphragm

Lesser omentum

Pancreas

Duodenum

Dorsal mesentery

Visceral peritoneum

Rectum

Small intestine

Figure A.10 Serous Membranes of the Abdominal Cavity.

Sagittal section, left lateral view.

Is the urinary bladder in the peritoneal cavity?

Small intestine

Parietal peritoneum Peritoneal cavity Urinary bladder

Diaphragm

Lesser omentum

Pancreas

Duodenum

Dorsal mesentery

Visceral peritoneum

Rectum

Atlas A General Orientation to Human Anatomy 39

Fluid Transport

Circulatory system Lymphatic system

Defense

Immune system

Input and Output

Respiratory system Urinary system Digestive system

Reproduction

Reproductive system

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Responses

  • asmara
    What organ is lateral to the small intestine?
    6 years ago
  • kristian milne
    Which organ in this transverse section of the abdomen is NOT within the peritoneal cavity?
    6 years ago

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