Cation: In chemistry, a positively charged ion. Pronounced cat-I-on.
A cation is as opposed to an anion, which is a negatively charged ion.
- Cauda equina
Cauda equina: A bundle of spinal nerve roots that arise from the end of the spinal cord. The cauda equina comprises the roots of all the spinal nerves below the first lumbar (L1) vertebra in the lower back.
- Cauda equina syndrome
Impairment of the nerves in the cauda equina, characterized by dull pain in the lower back and upper buttocks and lack of feeling (analgesia) in the buttocks, genitalia, and thigh, together with disturbances of bowel and bladder function.
Caudad: Toward the feet (or, in embryology, toward the tail), as opposed to cranial. The spinal cord is caudad to the brain. For a more complete listing of terms used in medicine for spatial orientation, please see the entry to “Anatomic Orientation Terms”.
Caudal: An anatomic term meaning 1. Pertaining to the tail or the hind part. 2. Situated in or directed toward the tail or hind part. 3. Inferior to another structure, in the sense of being below it. Caudal is also short for caudal epidural anesthesia. The terms caudal and caudad are both derived from the […]
- Caudal anesthesia
Caudal anesthesia: Anesthesia produced by injection of a local anesthetic into the caudal canal, the sacral portion of the spinal canal. Caudal anesthesia is used to provide anesthesia and analgesia (pain relief) below the umbilicus. It may be the sole anesthetic or combined with general anesthesia. Also known as caudal epidural anesthesia or a caudal […]