Body Planes & Directional Terms in Anatomy: Complete Reference

Anatomical Reference System: Planes & Directions

Standardized language for precise communication in medicine, imaging, surgery, and research.

Three Cardinal Planes

Plane	Divides Body Into	Key Reference
Sagittal (Median / Mid-sagittal)	Left & Right halves	Vertical, through midline (nose to navel to pubis)
Parasagittal	Unequal left/right	Parallel to median plane
Frontal (Coronal)	Anterior (front) & Posterior (back)	Vertical, ear-to-ear
Transverse (Horizontal / Axial)	Superior (upper) & Inferior (lower)	Horizontal, perpendicular to long axis
Oblique	Angled sections	Any non-cardinal angle (imaging)

Directional Terms (Paired)

Term	Meaning	Example
Superior / Cranial	Toward head	Heart is superior to diaphragm
Inferior / Caudal	Toward feet/tail	Stomach is inferior to heart
Anterior / Ventral	Front	Sternum is anterior to spine
Posterior / Dorsal	Back	Spine is posterior to heart
Medial	Toward midline	Big toe is medial to little toe
Lateral	Away from midline	Ear is lateral to nose
Proximal	Closer to attachment/trunk	Elbow is proximal to wrist
Distal	Farther from attachment	Fingers are distal to elbow
Superficial	Closer to surface	Skin is superficial to muscle
Deep	Farther from surface	Bone is deep to muscle
Ipsilateral	Same side	Right hand & right foot
Contralateral	Opposite side	Right brain controls left body

Clinical Application

• Imaging orders: "Axial CT chest with coronal/sagittal reformats."
• Surgical notes: "Incision 2 cm lateral to midline, 3 cm superior to pubis."
• Physical exam: "Tenderness at McBurney's point (RLQ, 1/3 distance ASIS to umbilicus)."
• Radiation planning: Target volumes defined in 3D coordinate space.

Master this vocabulary—it's the GPS of the human body.