either one of the eleventh pair of cranial nerves, consisting of motor fibers from the spinal cord that innervate the pharyngeal, trapezius, and sternocleidomastoid muscles, and motor fibers from the brain that join the vagus to innervate the thoracic and abdominal viscera.
either one of the eleventh pair of cranial nerves, which supply the muscles of the head, shoulders, larynx, and pharynx and the viscera of the abdomen and thorax
accessory nerve n.
A nerve that arises by two sets of roots: the cranial set, arising from the side of the medulla, and the spinal set, arising from the ventrolateral part of the first five cervical segments of the spinal cord. These two roots form the accessory nerve trunk, which divides into two branches: the internal, which unites with the vagus nerve in the jugular foramen and supplies the muscles of the pharynx, larynx, and soft palate; and the external, which continues through the jugular foramen to supply the sternocleidomastoid and trapezius muscles. Also called eleventh cranial nerve.
- Accessory obturator artery
accessory obturator artery accessory obturator artery n. An artery that is the pubic branch of the inferior epigastric artery when it contributes a significant supply through the obturator canal.
- Accessory pancreatic duct
accessory pancreatic duct accessory pancreatic duct n. The excretory duct of the head of the pancreas, one branch of which joins the pancreatic duct, the other opening into the duodenum. Also called Santorini’s duct.
- Accessory pigment
any pigment in plants that can absorb light energy and pass the electrons along to the primary pigment which starts the process of photosynthesis.
- Accessory phrenic nerve
accessory phrenic nerve accessory phrenic nerve n. Any of the accessory nerve strands that arise from the fifth cervical nerve, often as branches of the nerve to the subclavius, and pass downward to join the phrenic nerve.