Body Cavity Membranes

The anterior cavities of the body are lined with membranes called serous membranes (Figs. 1.6, 1.7). These secrete serous fluid. The membranes and the fluid provide a smooth, lubricated surface for the viscera. There are four serous membranes: the pericardium around the heart, the peritoneum around most of the abdomino-pelvic organs, and the two pleurae (sing. - pleura), one around each lung. Each serous membrane is folded twice around the internal organs so that there appears to be two membranes instead of one. Figure 1.8 illustrates how this is possible. A potential space exists between the two layers. The potential space around the heart is named the pericardial cavity. The potential space around a lung is a pleural cavity and the potential space around the abdominal viscera is the peritoneal cavity. The layer of each serous membrane closest to the viscera is the visceral layer, and the layer of the membrane closest to the wall of the body is the parietal layer.

Exercise 1.1

Label the figures with the correct words from the list below each drawing.

Label The Abdominal Vicera

Figure 1.5 Body Cavities

Abdominal cavity Abdominopelvic cavity (X2) Cranial cavity Dorsal cavity Mediastinum Pelvic cavity Pleural cavity Spinal cavity Thoracic cavity (X2) Ventral cavity y

Figure 1.6 Transverse Section though the Thoracic Cavity Parietal pericardium Parietal pleura Pericardial cavity Pleural cavity Visceral pericardium

Label The Visceral Membranes
Figure 1.7 Transverse Section through the Abdominal Cavity Parietal peritoneum Peritoneal cavity Visceral peritoneum
Label The Visceral Membranes
Figure 1.8 Serous Membrane. Note how a "circular" membrane can surround an organ in such a way as to form two layers from the one membrane.

Parietal layer Visceral layer

From the list below fill in the word which best completes each sentence. Each word may be used more than once or not at all.

5. __The thoracic cavity is (5) to the abdominopelvic cavity.

8. __The umbilicus (navel) is on the (8) surface of the body.

11. __The palms are on the (11) surface of the body, while the knuckles are on the posterior surface.

anterior deep distal inferior lateral medial posterior proximal superficial superior

16. _ Which section divides the body into upper and lower portions?

17. _ A student cuts a brain into two equal, right and left, portions. What kind of section has she made?

18. —„_ If you cut the brain into right and left sections which were not equal then the section would be (18) .

Which section would divide an organ into anterior and posterior portions?

In which of the nine abdominopelvic regions does the gallbladder lie? Look in your textbook for a picture of the gallbladder.

In which of the nine regions would you find the urinary bladder?

In which of the nine regions would you usually find the proximal end of the appendix?

The stomach lies in the (23) quadrant.

The liver is in the (24) quadrant.

The distal end of the descending colon is in the (25) quadrant.

CHAPTER

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