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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesNov 111 Vertebral column There are 33 vertebrae in the vertebral column and they get bigger as they go down to support the weight of the body There are 7 cervical vertebrae 12 thoracic 5 lumbar 5 sacral and 4 coccygeal Spinal nerves There are 31 pairs of spinal nerves that attach to the spinal cord There are 8 cervical 12 thoracic 5 lumbar 5 sacral and 1 coccygeal C1 spinal nerve exits above C1 vertebrae and C8 nerve exits below C7 vertebrae All other spinal nerves exit inferior to the vertebra of the same number A vertebra fracture could impede a nerve Spinal nerves exit the vertebral column through the intervertebral foramina Spinal nerves are connected to the spinal cord by a dorsal root sensory info and a ventral root motor info Cell bodies from the neurons in the dorsal root are located in the dorsal root ganglion Cell bodies of neurons in the ventral root are located in the ventral gray column of the spinal cord Spinal nerves fusion of dorsal and ventral lie lateral to the dorsal root ganglion and within the intervertebral foramina The spinal nerve then branches laterally into a dorsal ramus and ventral ramus The spinal nerve and the rami branches contain both sensory and motor fibres The rami go out into the periphery and innervate structures The dorsal ramus supplies the back of the neck and trunk The ventral ramus is larger and supplies anterior and lateral regions of the neck and trunk and all regions of the limbs Intercostal nerves are part of thoracic ventral rami and they supply the intercostal muscles Nerve plexus Is an intertwined network of ventral rami that occurs in the cervical brachial lumbar and sacral regions Each end branch of the plexus contains fibres from several different spinal nerves Fibres from each ventral ramus travel to the body periphery via several different routes The clinical sign
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