BIOS1171 Lecture Notes - Lecture 3: Brainstem, Anatomical Terms Of Location, Filum Terminale
22 Aug 2018
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Spinal cord: spinal cord is continuous with the medulla & exits via the foramen magnum at the base of the skull; stops at l1/l2, diameter: ~2cm, length: ~42-45cm, the higher the lesion the more severe, e. Dorsal root ganglion or spinal ganglion of sensory neurons: descending = motor nerves, ascending = sensory nerves. Ganglia (ganglion) (cid:498)groups of processes (sensory & motor fibres)(cid:499) Spinal cord nuclei: grey matter contains nuclei, dorsal horn: carries sensory information, s, n, dorsal horn nuclei contains 3 layers, marginal layer/zone, substantia gelatinosa (pain, nucleus proprius (pain) From brain with commands: descending tract: e. g. anterior corticospinal tract midline. Nuclei/nucleus (groups of cell bodies ground in grey matter) I: distal part of body is located laterally, proximal part of body is located medially, is somatotopic (body map links to myotome) S: c, s, t, b, l. Parts of plexus roots: c, s, t. Ipsilateral: info travels on same side: contralateral: info travels on opposite side, t, t.
