Define the following anatomical terms: Medial, Lateral, Superior, Inferior, Posterior, Proximal, Distal, Sagittal plane, Parasagittal plane, Transverse plane, Anatomy, Flexion, Extension.

• Medial: Towards the midline of the body.
• Lateral: Away from the midline of the body.
• Superior: Towards the head or upper part of a structure.
• Inferior: Away from the head or towards the lower part of a structure.
• Posterior (or dorsal): Towards the back of the body.
• Proximal: Closer to the origin of the body part or the point of attachment of a limb to the body trunk.
• Distal: Farther from the origin of the body part or the point of attachment of a limb to the body trunk.

• Sagittal plane: A vertical plane that divides the body or an organ into right and left sides.
• Parasagittal plane: A sagittal plane that is offset from the midline, dividing the body into unequal right and left parts.
• Transverse plane (or horizontal plane): A plane that divides the body or an organ into superior (upper) and inferior (lower) portions.

• Anatomy: The study of the structure of the body and its parts, and their relationships to one another.

• Flexion: A movement that decreases the angle between two body parts.
• Extension: A movement that increases the angle between two body parts.

$\boxed{\text{1. Medial: Towards the midline. 2. Lateral: Away from the midline. 3. Superior: Towards the head. 4. Inferior: Away from the head. 5. Anatomy: Study of body structure. 6. Sagittal: Divides body into right/left. 7. Posterior: Towards the back. 8. Parasagittal: Off-midline sagittal plane. 9. Transverse plane: Divides body into upper/lower. 10. Proximal: Closer to origin. Distal: Farther from origin. 11. Flexion: Decreases angle. Extension: Increases angle.}}$