BIOM20002 Lecture Notes - Lecture 12: Skeletal Muscle, Superior Vena Cava, Myocyte
Document Summary
3 types depending on striated/not striated, voluntary/involuntary, somatic/visceral: Long strands of muscle fibres with transverse striations. In the somatic system: all through the body, in limbs, abdomen, thorax. Under voluntary control, dependent on a somatic motor nerve supply to generate contraction. Can regrow when an individual is growing (but not when mature), can hypertrophy. In the heart and large blood vessels (aorta, superior vena cava, pulmonary vein) Shorter fibres with transverse striations, separate fibres meet at intercalated discs. In visceral organs: abdominal organs, forms blood vessel walls, under skin controlling movement of hair controlled by autonomic nervous system - involuntary. Able to hypertrophy (e. g. uterus) and can regenerate. Fascia: the connective tissue made of elastin, collagen, fibres. Endomysium: innermost thin, tubular sheath of connective tissue covering each individual muscle fibre - areolar, allows nerves+capillaries to enter individual muscle fibres. A bundle of muscle fibres groups to form muscle fascicles. The perimysium connective tissue layer covers the fascicle.
