Spinal Nerves - Easy way to understand it!
Way to remember the Spinal Nerves! Instagram: @rev.med, remember even though your having breakfast at 8 Cervical Nerve o clock, there are 7 Cervical Vertebrae, read more below! The spinal cord is situated within the spine. The spine consists of a series of vertebral segments. The spinal cord segmental levels do not necessarily correspond to the bony segments. Vertebral segments There are 7 cervical (neck), 12 thoracic (chest), 5 lumbar (back), and 5 sacral (tail) vertebrae. The spinal cord sends roots that exit the spinal canal between vertebral bodies. Spinal cord nerves are not always situated at the corresponding vertebral levels. For example, the C8 cord segment is situated in the C7 vertebra while the T12 cord is situated in the T8 vertebra. The lumbar cord is situated between T9 and T11 vertebrae. The sacral cord is situated between the T12 to L2 vertebrae. The Cervical Cord The cervical cord innervates the deltoids (C4), biceps (C4-5), wrist extensors (C6), triceps (C7), wrist extensors (C8), and hand muscles (C8-T1). The Thoracic Cord The thoracic vertebral segments are defined by those that have a rib. These vertebral segments are also very special because they form the back wall of the pulmonary cavity and the ribs. The spinal roots form the intercostal (between the ribs) nerves that run on the bottom side of the ribs and connect to the intercostal muscles and associated dermatomes. The Lumbosacral Cord The lumbosacral vertebra form the remainder of the segments below the vertebrae of the thorax. The lumbosacral spinal cord, however, starts at about T9 and continues only to L2. It contains most of the segments that innervate the hip and legs, as well as the buttocks and anal regions. Connections are great, whether it’s eating (way to early) dinner at 5 and spinal nerves or Atlantis C1 holding up the world (Occiput), just make the connection! Studying Anatomy isn’t always easy, and we know that... See how we teach on our YouTube channel and maybe it will help, link in bio!
