Definition

Noun: * Spinal accessory: A cranial nerve (the eleventh cranial nerve) that arises from two sets of roots—one in the brain (cranial) and one in the spinal cord (spinal)—which unite to form a single nerve. It primarily controls the sternocleidomastoid and trapezius muscles, which are involved in movements of the head, neck, and shoulders.

Usage

• The term spinal accessory is used almost exclusively in medical and anatomical contexts to refer to this specific nerve.
• It is commonly used with the definite article "the" (e.g., spinal accessory nerve).
• It can be modified by adjectives describing its function or condition (e.g., spinal accessory, spinal accessory).

Examples

• During the neck dissection surgery, the surgeon carefully identified and preserved the spinal accessory nerve.
• Weakness in shoulder elevation can be a sign of spinal accessory nerve palsy.
• The spinal accessory has both a cranial and a spinal root, which is unique among the cranial nerves.

Advanced Usage

• Spinal accessory nerve palsy: A medical condition involving paralysis or weakness of the muscles innervated by this nerve, often due to injury.
  • The patient was diagnosed with spinal accessory nerve palsy after the lymph node biopsy.
• In detailed anatomical descriptions, the full term spinal accessory nerve is often abbreviated to cranial nerve XI or CN XI.

Variants and Related Words

• Accessory nerve: A more common synonym for spinal accessory nerve. The terms are often used interchangeably.
• Cranial nerve XI / CN XI: The formal numerical designation for this nerve within the set of twelve cranial nerves.
• Nervus accessorius: The Latin term used in international anatomical terminology.

Synonyms

• Accessory nerve
• Eleventh cranial nerve
• Cranial nerve XI

Related Phrases

• Spinal accessory nerve injury: Damage to this nerve, often iatrogenic (caused by medical procedures).
  • Hoarseness and shoulder drop are potential complications of spinal accessory nerve injury.
• Spinal root of accessory nerve: Specifically refers to the fibers originating from the spinal cord, which join the cranial root.

Noun

1. arises from two sets of roots (cranial and spinal) that unite to form the nerve