MUSCLE FIBERS LONG, SLENDER CELLS THAT MAKE UP MUSCLES FASCIA THE SHEET OF FIBROUS CONNECTIVE TISSUE THAT COVERS, SUPPORTS, AND SEPERATES MUSCLE OR GROUPS OF MUSCLES MYOFASCIAL PERTAINING TO THE MUSCLE TISSUE AND FASCIA TENDON NARROW BAND OF NONELASTIC, DENSE, FIBROUS CONNECTIVE TISSUE THAT ATTACHES A MUSCLE TO A BONE ACHILLES TENDON ATTACHES THE GASTROCNEMIUS MUSCLE (THE MAJOR PART OF THE CALF OF THE LEG) TO THE HEEL BONE APONEUROSIS A SHEETLIKE FIBROUS CONNECTIVE TISSUE THAT RESEMBLES A FLATTENED TENDON THAT SERVES AS A FASCIA TO BIND MUSCLES TOGETHER OR AS A MEANS OF CONNECTING MUSCLE TO BONE THREE TYPES OF MUSCLE TISSUE SKELETAL, SMOOTH, AND MYOCARDINAL SKELETAL MUSCLES ARE ATTACHED TO THE BONES OF THE SKELETON AND MAKE BODY MOTIONS POSSIBLE VOLUNTARY MUSCLES WE HAVE CONSCOIUS CONTROL OVER THESE MUSCLES (SKELETAL MUSCLES ARE KNOWN AS THESE) STRIATED (STRIPED) MUSCLES UNDER A MICROSCOPE, THE DARK AND LIGHT BANDS IN THE MUSCLE FIBERS CREATE A STRIPED APPEARANCE (SKELETAL MUSCLES ARE KNOWN AS THIS) LOCATION OF SMOOTH MUSCLES LOCATED IN THE WALLS OF THE INTENAL ORGANS SUCH AS THE DIGESTIVE TRACK, BLOOD VESSELS, AND DUCTS LEADING FROM THE GLANDS FUNCTION OF SMOOTH MUSCLES MOVE AND CONTROL THE FLOW OF FLUIDS THROUGH THESE STRUCTURES INVOLUNTARY MUSCLES THEY ARE UNDER THE CONTROL OF THE AUTONOMIC NERVOUS SYSTEM AND ARE NOT UNDER VOLUNTARY CONTROL (SMOOTH MUSCLES ARE KNOWN AS THIS) UNSTRIATED MUSCLES THEY DO NOT HAVE DARK AND LIGHT BANDS THAT PRODUCE THE STRIPED APPEARANCE THAT IS SEEN IN STRIATED (SMOOTH MUSCLES ARE KNOWN AS THIS) VISCERAL MUSCLES ARE FOUND IN LARGE INTERNAL ORGANS (EXCEPT THE HEART) AND IN HOLLOW STRUCTURES SUCH AS THOSE OF THE DIGESTIVE AND URINARY SYSTEM VISCERAL RELATING TO THE INTERNAL ORGANS MYOCARDIAL MUSCLES LIKE STRIATED SKELETAL MUSCLE IN APPEARANCE, BUT IS SIMILAR TO SMOOTH MUSCLE IN THAT ITS ACTION IS INVOLUNTARY (FORM THE MUSCULAR WALLS OF THE HEART - ALSO KNOWN AS MYOCARDIUM OR CARDIAC MUSCLE) MUSCLE INNERVATION THE STIMULATION OF A MUSCLE BY AN IMPULSE TRANSMITTED BY A MOTOR NERVE NEUROMUSCULAR PERTAINING TO THE RELATIONSHIP BETWEEN NERVE AND MUSCLE ANTAGONISTIC PAIRS ALL MUSCLES ARE ARRANGED THIS WAY ANTAGONISTIC WORKING IN OPPOSITION TO EACH OTHER CONTRACTION TIGHTENING OF A MUSCLE. AS MUSCLE CONTRACTS IT GETS SHORTER AND THICKER CAUSING THE BELLY (CENTER) OF THE MUSCLE TO ENLARGE. RELAXATION OCCURS WHEN A MUSCLE RETURNS TO ITS ORIGINAL FORM. AS THE MUSCLE RELAXES IT BECOMES LONGER AND THINNER AND THE BELLY IS NO LONGER ENLARGED.