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Body Planes and Cavities
Principles of Health Science
Standard Anatomical Position
Body Planes• Imaginary lines drawn through body to separate
the body into section. • Directional terms create planes• Three main body planes: Transverse, Midsagittal
(median), frontal (coronal) plane
Transverse Plane• Horizontal plane• Divides the body into a top half and bottom half
o Directional terms associated with transverse:• Superior – body parts above• Inferior – body parts below
Midsagittal (median) Plane
• Divides the body into a right and left sideo Directional terms associated with midsagittal:
• Medial – body parts close to midline• Lateral – body parts away from the midline
Frontal or Coronal Plane
• Divides the body into front section and back sectiono Directional terms associated with frontal:
• Ventral or Anterior – body parts in front of plane or in front of the body
• Dorsal or Posterior – body parts in back of plane or in back of body
Directional Terms
Directional Terms • Extremities in relation to trunk (point of
reference)o Proximal – body part closest to point of referenceo Distal – body part farther or most distant from the point of reference
• Example: Relationship between wrist, elbow and shoulder, with shoulder being the point of reference.o Wrist is distal to elbowo Elbow is proximal to shoulder
Body Cavities• Spaces within body that contain vital organs• Two main body cavities: Dorsal Cavity and Ventral
Cavity
Dorsal Cavity• One long, continuous cavity located on back of
body• Divided into two sections:
o Cranial Cavity – contains the braino Spinal Cavity – contains the spinal cord
Ventral Cavity• Larger than dorsal cavity,
separated into two cavities by the diaphragm.o Thoracic Cavity: located in the
chest and contains heart, lungs and large blood vessels
o Abdominal Cavity: divided into upper and lower part• Upper Abdominal Cavity –
contains stomach, small intestine, most of large intestine, liver, gallbladder, pancreas and spleen
Ventral Cavity, cont.- Lower Abdominal Cavity or pelvic cavity – contains urinary
bladder, reproductive organs, and last part of the intestines
Additional Cavities• Three small cavities
o Orbital cavity: contains eyeso Nasal cavity: contains nose structureso Buccal cavity: contains mouth