Body OrganizationPart II

BIO 201Kelly Trainor, PhD

Objectives Describe the anatomical position. Use correct anatomical terminology to describe body directions,

body regions, and body planes or sections. Locate and name the major body cavities and their subdivisions and

associated membranes, and list the major organs contained within them.

Name the four quadrants or nine regions of the abdominopelvic cavity and list the organs they contain.

Directional Terms

Directional Terms

Directional Terms

Body Planes and Sections A sagittal section divides the body (or organ) into left and right parts A median, or midsagittal, section divides the body (or organ) into

equal left and right parts A frontal section divides the body (or organ) into anterior and

posterior parts A transverse, or cross, section divides the body (or organ) into

superior and inferior parts

Body Cavities Dorsal body cavity

Cranial cavity houses the brain

Spinal cavity houses the spinal cord

Ventral body cavity Thoracic cavity houses

heart, lungs and others Abdominopelvic cavity

houses digestive system and most urinary system organs

Body Cavities Thoracic cavity

subdivisions: Two pleural cavities

Each houses a lung Mediastinum

Contains pericardial cavity

Surrounds thoracic organs

Pericardial cavity Encloses heart

Serous Membranes Thin, double-layered

membrane separated by serous fluid Parietal serosa lines

internal body walls Visceral serosa covers the

internal organs

Abdominopelvic Major Organs

Abdominopelvic Regions

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Activities Regional Terms (Anterior) – Labeling Regional Terms (Posterior) – Labeling Body Cavities – Labeling Body Cavities – Memory Game