2 3 Types of MusclesSmooth Muscles- Which include the muscles of internal organs and blood vessels. These muscles move involuntary.Cardiac Muscle- Found only in the heart and also involuntary.Skeletal Muscles- Are voluntary and help you move.
6 Direction of Muscle Fibers Relative to the MidlineRECTUS = parallel tothe midlineRectus AbdominusTRANSVERSE =perpendicular to midlineTransverse AbdominusOBLIQUE = diagonal tomidlineExternal Oblique
7 Location Structure near which muscle is found FRONTALIS = near FRONTAL boneOCCIPITALIS = near OCCIPITAL bone
8 Size Relative Size of Muscle MAXIMUS = largest Gluteus Maximus MEDIUS = middleGluteus MediusMINIMUS = smallestGluteus MinimusLONGUS = longestFibularis LongusBREVIS = shortFibularis BrevisTERTIUS = shortestFibularis Tertius
9 Origin & Insertion Origin – attachment to an immoveable bone Insertion – attachment toa movable boneILIO COSTALIS= attaches tothe ilium & ribs (costal = ribs)
10 NAME ACTION EXAMPLE FLEXOR EXTENSOR ABDUCTOR ADDUCTOR LEVATOR Decrease angle at a jointFlexor Carpi RadialisEXTENSORIncrease angle at a jointExtensor Carpi UlnarisABDUCTORMove bone away from midlineAbductor Pollicis LongusADDUCTORMove bone toward midlineAdductor LongusLEVATORProduce upward movementLevator ScapulaeDEPRESSORProduce downward movementDepressor Labii InferiorisSUPINATORTurn palm upward/anteriorSupinatorPRONATORTurn palm downward/posteriorPronator Teres
11 Characteristics of Muscles Muscle cells are elongated (muscle cell = muscle fiber)Contraction of muscles is due to the movement of microfilamentsAll muscles share some terminologyPrefix myo refers to musclePrefix mys refers to musclePrefix sarco refers to flesh
12 Muscle Movement Involuntary- Automatically move without you knowing. Voluntary- Brain sends message to muscle. You control the movements.
13 Muscle Movementisometric contraction muscle contraction without appreciable shortening or change in distance between its origin and insertion.
14 Muscle Movementisotonic contraction muscle contraction without appreciable change in the force of contraction; the distance between the muscle's origin and insertion becomes lessened.
15 Muscle MovementTonic-sustained muscular contraction without intervals of relaxation. (maintaining posture)