PHTY100 Lecture Notes - Lecture 11: Anterior Ramus Of Spinal Nerve, List Of Lumbar Nerves, Spinal Nerve
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8. 1 define the following terms: spinal cord, this is the cylindrical bundle of nerve fibres and associated tissue which is enclosed in the spine. It is formed by the divisions of the first four lumbar nerves (l 1,2,3,4) It originates in the spinal nerves of the midback and innervates in the pelvic area. Within the substance of the psoas major: lumbosacral plexus, this is a nervous plexus in the lumbar region of the body. It is formed by (l 4,5 and s 1,2,3) supplies the lower limb. 8. 3 identify the following branches of the lumbar and lumbosacral plexes on the anterior spinal cord model and specimens and describe their distribution: Lumbar plexus: femoral, this is the largest branch of the lumbar plexus. It arises from the dorsal division of the ventral rami and descends through the fibres of the psoas major muscle. It passes downwards and forwards onto the pelvic surface of the iliacus.
