Definition

1. Adjective:
   • Belonging to or on or near the back or upper surface of an animal or organ or part: Refers to the anatomical position or surface that is toward the back or top. In animals, this is the side opposite the belly (ventral side).
   • Facing away from the axis of an organ or organism: In botany and biology, describes a surface that is oriented away from the central axis or stem.

Examples of Usage

• Adjective:
  • The dorsal fin of a shark helps with stability while swimming.
  • In humans, the dorsal side of the hand is the back of the hand.
  • The dorsal surface of a leaf is typically the upper side, facing away from the stem.

Advanced Usage

• Dorsal root: In anatomy, the sensory root of a spinal nerve that enters the dorsal part of the spinal cord.
  • The dorsal root ganglia contain the cell bodies of sensory neurons.
• Dorsal position: Refers to lying on one's back.
  • The patient was placed in a dorsal position for the examination.

Variants and Related Words

• Dorsally (adverb): Toward or on the dorsal side.
  • The nerves extend dorsally from the spinal column.
• Dorsoventral (adjective): Extending from the dorsal to the ventral side.
  • A dorsoventral axis runs from the back to the belly.

Synonyms

• Abaxial: (Specifically in botany) Facing away from the axis.
• Posterior: (In anatomy, especially in bipedal organisms) Situated toward the rear or back. (Note: "Posterior" and "dorsal" are often synonymous in human anatomy but can differ in four-legged animals.)

Antonyms

• Ventral: Pertaining to the belly or underside.
• Adaxial: (In botany) Facing toward the axis.

Related Phrases / Compound Terms

• Dorsal cavity: The body cavity in the posterior portion of the body, housing the brain and spinal cord.
  • The cranial cavity is part of the dorsal cavity.
• Dorsal scapular nerve: A nerve that innervates muscles of the upper back.
  • Injury to the dorsal scapular nerve can affect shoulder movement.

Adjective

1. facing away from the axis of an organ or organism
   • the abaxial surface of a leaf is the underside or side facing away from the stem
2. belonging to or on or near the back or upper surface of an animal or organ or part
   • the dorsal fin is the vertical fin on the back of a fish and certain marine mammals