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Development of the Muscular System Ch 6 Muscular System Development • Muscles laid down in segments – Like an earthworm – Invaded by nerves – Lumbar and thoracic extensive • Occurs early in pregnancy – Week 16 or so – Quickening Post Partum • Begin as gross reflex type movments – Babies are spastic – Need neural development to control • Cephalic to caudal – Head up before sitting • Proximal to distal – Wave before pinch • Gross before fine Muscle Problems • Great blood supply so little infection • If taken care of few problems • Poor nutrition or lack of use leads to atrophy • Age effects – Connective tissue increase – Muscle fibers decrease – Muscle strength declines (50% at 80) Diseases • Muscular Dystrophy – Fat and connective tissue laid down – Muscle fibers degenerate – Duchenne’s MD • • • • 2-7 years Clumsy to lack of muscle control No cure Fatal in 20’s Normal Muscle Tissue Duchenne Muscle Tissue Diseases • Myasthenia Gravis – Asthen = weak – Gravi = heavy – Drooping eyelids – Caused by lack of ACh receptors • Autoimmune? – Muscles get weaker • respiration Injection sites Less than 5 ml Kids More than 5 ml
