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Reference Guide

Spinal Cord - Reference Guides

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ANAT - Anatomy
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pe rm a ch ar ts MT Spinal Cord 2nd EDITION Figure 1: Spinal Cord (Posterior View) Figure 2: Spinal Cord & Sympathetic Trunk Figure 1: Spinal Cord 6 7 1 Cervical nerves (8 pairs) • The two components of the nervous 2 Thoracic nerves (12 pairs) system are the central nervous system 8 3 Lmbar nerves (5 pairs) 9 4 Scral nerves (5 pairs) (CNS) and the peripheral nervous 4 5 5 Coccygeal nerves (1 pair) system (PNS) • The CNS is where 10 7 Brachial plexus information is processed, and 11 8 Sinal cord 6 includes the brain and spinal cord 9 Itercostal nerves 1 10 Conus medullaris • The PNS carries information 3 12 11 Cauda equina between the CNS and the 12 Lumbar plexus rest of the body, and 13 13 Sacral plexus 7 2 14 Siatic nerve includes sensory and motor divisions • The motor Sympathetic TrunkCord & 8 neurons of the somatic 2 nervous system transmit 2 Vertebral bodydisc signals (contract or relax) 3 White &gray Rami 9 communicantes to skeletal muscle • This 4 Sinal ganglion 10 type of response is 14 5 Arachnoid considered voluntary, 6 Gray matter 11 though sometimes 7 White matter skeletal muscle 1 8 Filaments of ventral root 9 Pia mater 3 12 movement is controlled 11 Ventral primary ramus by automatic reactions (spinal nerve) known as reflexes 12 Dura mater • The autonomic 13 Sympathetic trunk 13 14 Sympathetic ganglion 4 nervous system (ANS) controls Figure 3: Segmental 14 smooth and cardiac Innervation 5 muscle (heartbeat) • Each spinal nerve has both a and glandular motor component (indicated in Figure 3: Segmental Innervation red) and a sensory component secretion, which (indicated in blue) • The motor are involuntary 6 7 innervate a specific myotome responses 8 (a region of skeletal muscle) • The sensory fibers fromthe 5 dorsal root innervate a specific 9 dermatome (a region of skin) Figure 4: Dermatomes 4 3 1 Dermatome • A dermatome is one 2 Myotome of several interlocking 2 3 Spinal ganglion areas of skin that are 4 Dorsal root 6 Dorsal intermediate sulcus each supplied by the 1 7 Commissure of gray matter dorsal (sensory) root of 14 8 Dorsal horn of gray matter a single spinal nerve 13 10 9 Lateral horn of gray matter • Because there is 10 Ventral horn of gray matter considerable overlap of 12 11 11 Ventral median fissure adjoining dermatomes, 12 White matter an area is not Figure 5: Spinal Cord Tracts (Cross Section) 13 Filaments of ventral root 14 Ventral root anesthetized unless two • There are two types of spinal cord tracts: Figure 4: Dermatomes or more consecutive ascending (indicated in blue) and descending 1 Cranial nerve V roots dorsal roots have lost (indicated in red) • For clarity, each type of tract (yellow area) function 2 Cervical nerve roots is shown on only one half of the spinal cord (blue area) 1 3 Thoracic nerve roots 1 17 2 (red area) 2 4 Lumbar nerve roots 16 (green area) 5 Sacral nerve roots (purple area) 3 Figure 5: Spinal Cord Tracts
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