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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesOct 1111 Components of the spinal cordEntry point for sensory information in spinal nervesContains somatic motor neurons of spinal nervesContains visceral motor neuronsthoracic sympathetic and sacral parasympathetic Ascending and descending sensory and motor pathways to the brain crossed and uncrossed Specialized regions Decreasing white matter caudally Cerebrospinal fluid can be sampled below the end of the spinal cord Contains the anatomical components of motor reflexes Lesions in different parts of the spinal cord produce sensory and motor abnormalities related to the functions of the tracts that have been damagedFunction of the spinal cord Through the spinal nerves that attach to it it is involved in sensory and motor innervation of the entire body It provides a twoway conduction pathway for signals between the body and the brain It is a major centre for reflexes The spinal cord extends from the foramen magnum at the occipital bone to the first or second lumbar vertebra L1 or L2 The end of the spinal cord is called the conus medullaris The filum terminale attaches and anchors the spinal cord to the coccyx There are 31 pairs of spinal nerves that are attached to the spinal cord through dorsal and ventral nerve rootsThere are 8 cervical nerves 12 thoracic nerves 5 lumbar nerves 5 sacral nerves and 1 coccygeal nerve There are cervical and lumbar enlargements which have to be bigger because this is where the nerves to the upper and lower limbs arise There is info coming in and out from the upper and lower limbs here The spinal cord is a segmented structure It forms from the neuroectoderm When the spinal cord develops it doesnt grow to be as long as the vertebral column At birth the spinal cord ends at the level of the lumbar vertebra L3 but b
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