sagittal plane

Sagittal plane
Diagram showing sagittal, coronal and transverse planes.
Latin	plana sagittalia

A sagittal plane of the human body is an imaginary plane that travels vertically from the top to the bottom of the body along the Y axis, dividing it into left and right portions.

Variations

Examples include:

• The terms median plane or mid-sagittal plane are sometimes used to describe the sagittal plane running through the midline. This plane cuts the body into two halves of equal portions (assuming bilateral symmetry),^[1] passing through midline structures such as the navel and spine. It is one of the lines defining the right upper quadrant of the human abdomen.

• In general, planes that are parallel to the sagittal plane, but do not pass through the midline, are known as parasagittal.
  • The midclavicular line crosses through the clavicle.
  • Other sagittal lines/planes include the "lateral sternal" and "parasternal".^[2]

Terminology

The term is derived from the Latin word Sagitta, meaning "arrow". An image of an arrow piercing a body and passing from front (anterior) to back (posterior) on a parabolic trajectory would be one way to demonstrate the derivation of the term. Another explanation would be the notching of the sagittal suture posteriorly by the lamboidal suture—similar to feathers on an arrow.

Sagittal axis: Sagittal axis is the axis perpendicular to the sagittal plane, i.e. the sagittal axis lies in the coronal plane. Abduction and adduction are terms for movements of limbs relative to the coronal plane.

Coronal (or frontal) axis: Coronal axis is the axis perpendicular to the coronal plane, i.e. the coronal axis lies in the sagittal plane. Extension and flexion is the movement of limb in sagittal plane.

Anatomy

From a broader perspective, it is one of the planes of the body used to describe the location of body parts in relation to each other - for example, the extent of prognathism. The other reference planes used in anatomy are:

• The coronal (or frontal) plane divides the body into ventral (anterior) and dorsal (posterior) commonly known as the front (anterior) and back (posterior) portions.
• A transverse (or horizontal) plane divides the body into cranial and caudal (top and bottom) portions in medical terminology known as the superior and inferior portions of the body.

See also

• Anatomical terms of location

References

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