Webspinal nerve, in vertebrates, any one of many paired peripheral nerves that arise from the spinal cord. In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the … WebThe sensory axons enter the spinal cord as the dorsal nerve root. The motor fibers, both somatic and autonomic, emerge as the ventral nerve root. The dorsal root ganglion for each nerve is an enlargement of the spinal nerve. There are 31 spinal nerves, named for the level of the spinal cord at which each one emerges.

Overview of the Peripheral Nervous System - Brain, Spinal Cord, and

WebApr 12, 2024 · Each segment of the spinal cord provides several pairs of spinal nerves, which exit from vertebral canal through the intervertebral foramina. There are 8 pairs of cervical, 12 thoracic, 5 lumbar, 5 sacral, and … WebMost preganglionic neurons in the sympathetic nervous system originate in the spinal cord, as illustrated in Figure 2. The axons of these neurons release acetylcholine on postganglionic neurons within sympathetic ganglia (the sympathetic ganglia form a chain that extends alongside the spinal cord). The acetylcholine activates the postganglionic … data that should be included on an audit log

Nervous system - The vertebrate system Britannica

WebSpinal Cord and Peripheral Nerves. I. Introduction and Review A. Divisions of the Nervous System 1. Structural a. Central Nervous System 1) Brain and Spinal Cord 2) Integrates, … WebFeb 12, 2004 · Like your brain, your spinal cord is part of your central nervous system. Its main function is to relay information about what's happening inside and outside your body to and from your brain.... data that ranges on a continuous scale