Body cavities n membranes

3 subdivisions of the ventral body cavity n their respective serous membrane linings

(1) pleural cavities (collectively referred to as the pleura) - parietal n visceral pleural membranes (2) the pericardial cavity - (pericardium = the parietal and visceral pericardium) (3) the peritoneal cavity - (peritoneum = parietal peritoneum which lines the walls of the abdominopelvic cavity n the visceral peritoneum which line the organs).

major body cavities

1. dorsal body cavity 2. ventral body cavity

pleur

rib /side

plural of serosa

serosae

body cavities (def)

spaces within the body that contain the internal organs

lines the surface of the heart

visceral pericardium

lines the organs in the abdominopelvic cavity

visceral peritoneum

serous membrane that covers the surface of each lung

visceral pleura

pluera

wrong!!!!! pLEUra

diaphram

WRONG!!!! diaphraGm!!!

lines the pericardial cavity

parietal pericardium

lines the walls of the abdominopelvic cavity

parietal peritoneum

serous membranes that lines pleural cavity

parietal pleura

body cavities fn

- space that houses an organ(s) - protects the organ(s) - supports the organ(s) - closed to the outside

coelom (pronounced saelom)

- / body cavities - = ventral body cavity - contains majority of the viscera (organs) - more anterior and larger of the two internal body cavities -subdivided by a muscle called the diaphragm into superior thoracic cavity n inferior abdominopelvic cavity

cranial cavity

- / body cavities / dorsal body cav. - contains t brain

vertebral cavity

- / body cavities / dorsal body cav. - contains the spinal cord

dorsal body cavity

- / body cavities : dorsal, cranial, vertebral same as regional name 1. cranial cavity (contains the brain) 2. vertebral cavity (contains the spinal cord)

thoracic cavity

- / body cavities/ ventral: coelom body cav - chest cavity - protected by the ribs and sternum - 3 compartments: 2 lateral pleural cavities, medial pericardial cavity

2 lateral pleural cavities

- / body cavities/ ventral: coelom body cav/ chest:thoracic cav - R n L pleural cavities (total 2 pleural cavs) - each surround a lung - lined by parietal pleura, visceral pleura

diaphragm

- / body cavities/ ventral: coelom body cav/ thoracic:chest cav - a mucle that separates thoracic n abdominopelvic cavity - important 4 breathing

pleura

- = serous membranes

lymphoid system

- =lymphatic system -eg. spleen

serosa

- body cavities/ ventral: coelom body cav - a serous membrane

pleurisy

- body cavities/ ventral: coelom body cav - disease: pleural membranes become inflamed, stick together by adhesions - this impedes the movement of the lungs, makes it is extremely painful to breath.

serous fluid

- body cavities/ ventral: coelom body cav - fluid in the space between the parietal membrane n visceral membrane - secreted by both the parietal and visceral serosae - reduces friction, permits the organs to move easily within their cavities

abdominopelvic cavity

- body cavities/ ventral: coelom body cav - inferior to the diaphragm - subdivided into superior abdominal cavity and an inferior pelvic cavity - no physical structure dividing these two cavities

a serosa lining a cavity

- body cavities/ ventral: coelom body cav - parietal membrane

relationship of serous membranes of the ventral body cav

- body cavities/ ventral: coelom body cav - ventral body cavities n the organs contained r lined w slippery membranes = serous membranes (serous means watery) - a serous membrane ( serosa) lining a cavity is called the parietal membrane. A serous membrane or serosa covering the viscera is called a visceral membrane. There is fluid (serous fluid) in the space between the membranes.

a serosa covering the viscera

- body cavities/ ventral: coelom body cav - visceral membrane

pericardial cavity

- body cavities/ ventral: coelom body cav/ chest:thoracic - medially located btw the lungs in the mediastinum - contains the heart - pericardium

visceral pleura

- body cavities/ ventral: coelom body cav/ chest:thoracic cav, pleura - serous membrane that covers the surface of each lung

parietal pleura

- body cavities/ ventral: coelom body cav/ chest:thoracic cav, pleura - serous membranes that lines pleural cavity

mediastinum contains

- body cavities/ ventral: coelom body cav/ chest:thoracic/ pericardial cavity -everything in the thoracic cavity except the lungs in their pleural cavities - thymus - pericardial cavity - great vessels of the heart - trachea - esophagus

mediastinum

- body cavities/ ventral: coelom body cav/ chest:thoracic/ pericardial cavity - = standing in the middle - solid mass of tissue between the lungs - extends from the sternum to the vertebral column n contains everything in the thoracic cavity except the lungs

pericardium

- body cavities/ ventral: coelom body cav/ chest:thoracic/ pericardial cavity - parietal pericardium (lines the pericardial cavity) - visceral pericardium (lines the surface of the heart)

abdominal cavity

- body cavities/ ventral: coelom body cav/abdominopelvic - (superior) - abdominal is derived from a word that means "to hide". Hides the viscera. - protected ventrally only by skin, fat and muscles, and a few other internal structures

pelvic cavity

- body cavities/ ventral: coelom body cav/abdominopelvic - smaller and inferior to the abdominal cavity - lies in the bony pelvis - tipped away from the perpendicular (not straight up/ down/ aligned w abdominal cav

abdominal cavity contains

- body cavities/ ventral: coelom body cav/abdominopelvic -most of the digestive system viscera: stomach, liver, gallbladder, pancreas, small intestine, most of the large intestine, spleen (part of the lymphatic/ lymphoid system)

pelvic cavity contains

- body cavities/ ventral: coelom body cav/abdominopelvic/ - both sexes: urinary bladder, sigmoid colon, rectum - males: prostate, seminal vesicles, vas deferens, parts of the urethra - females: ovaries, uterus, vagina

superficial anatomical landmarks 4 pelvic cav

- body cavities/ ventral: coelom body cav/abdominopelvic/ pelvic - use the sacrum posteriorly and the top of the pubic bones anteriorly as superficial anatomical landmarks to the cavity

dorsal body cavity fn

- gives the greatest degree of protection - cuz it is protecting our CNS - bones make up the hard walls of this cavity

difference of the 2 body cavities

- have different embryological origins - differ in degree of protection afforded to the organs that lie within them

ventral body cavity is called

coelom

chest cavity

thoracic cavity