Prime movers provide the major force for producing a specific movement Antagonists oppose or reverse a particular movement Synergists
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1 Dr. Gary Mumaugh
2 Prime movers provide the major force for producing a specific movement Antagonists oppose or reverse a particular movement Synergists Add force to a movement Reduce undesirable or unnecessary movement
3 Location of muscle bone or body region associated with the muscle Shape of muscle e.g., the deltoid muscle (deltoid = triangle) Relative size e.g., maximus (largest), minimus (smallest), longus (long) Direction of fibers e.g., rectus (fibers run straight), transversus, and oblique (fibers run at angles to an imaginary defined axis)
4 Number of origins e.g., biceps (two origins) and triceps (three origins) Location of attachments named according to point of origin or insertion Action e.g., flexor or extensor, as in the names of muscles that flex or extend, respectively
5 The 40 superficial muscles here are divided into 10 regional areas of the body
6 The 27 superficial muscles here are divided into seven regional areas of the body
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10 The prime mover of back extension is the erector spinae Erector spinae, or sacrospinalis, muscles consist of three columns on each side of the vertebrae iliocostalis, longissimus, and spinalis Lateral bending of the back is accomplished by unilateral contraction of these muscles Other deep back extensors include the semispinalis muscles and the quadratus lumborum
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12 The primary function of deep thoracic muscles is to promote movement for breathing External intercostals more superficial layer that lifts the rib cage and increases thoracic volume to allow inspiration
13 Internal intercostals deeper layer that aids in forced expiration Diaphragm most important muscle in inspiration
14 Figure 10.11a
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17 Most superficial posterior thorax muscle Large triangular shape O Occiptal, ligamentum nuchae, C7-T12 Stabilizes, raises and retracts scapula Superior fibers elevate as in shruggung Middle fibers retract (adduct) Inferior fibers depress scapula
18 Broad flat triangular low back muscle that is covered by inferior trapezius Part of posterior axilla wall O fascia of lower lumbar, T6-12, lower ribs and iliac crest I humerus A - Prime mover of arm extension and adduction of arm
19 Nine muscles cross the shoulder joint and insert into the humerus The ball and socket shoulder joint is thenmost flexible joint in the body Prime movers (are all superficial) include: Pectoralis major arm flexion Latissimus dorsi and posterior fibers of the deltoid arm extension Middle fibers of the deltoid arm abduction
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21 Large fan shaped over upper chest O - medial half of clavicle, sternum, superior six costal cartilages, and aponeurosis of external oblique muscle I humerus A adducts, medially rotates humerus Round shoulder mass Common site of IM injection O - lateral third of clavicle, acromion, and spine of scapula I - humerus A -flexes and medially rotates arm, abducts arm, extends and laterally rotates arm
22 Broad triangular low back muscle with extensive superficial origins Covered by trapezius superiorly Contributes to the posterior axilla wall Prime mover of arm extension Powerful arm adductor Depresses scapula Because of its power, it plays a role in bringing the arm down in a power stroke
23 O - Long head: scapula Lateral head: posterior humerus Medial head: posterior humerus I - olecranon process of ulna and fascia of forearm A - powerful arm extensor and antagonist of arm flexors Anconeus muscle is also a synergist muscle of elbow extension
24 O - Short head: coracoid process of scapula Long head: supraglenoid tubercle of scapula I - tuberosity of radius and fascia of forearm via bicipital aponeurosis A - Supinates forearm and, when it is supine, flexes forearm
25 The two functional forearm muscle groups are: those that cause wrist movement, and those that move the fingers and the thumb These muscles insert via strong ligaments called flexor and extensor retinacula Most anterior muscles are flexors, and posterior muscles are extensors The pronator teres and pronator quadratus are not flexors, but pronate the forearm The supinator muscle is a synergist with the biceps brachii in supinating the forearm
26 These muscles are primarily flexors of the wrist and fingers
27 These small muscles: Lie in the palm of the hand (none on the dorsal side) Move the metacarpals and fingers Control precise movements (e.g., threading a needle) Are the main abductors and adductors of the fingers Produce opposition move the thumb toward the little finger
28 Most anterior compartment muscles of the hip and thigh flex the femur at the hip and extend the leg at the knee Posterior compartment muscles of the hip and thigh extend the thigh and flex the leg The medial compartment muscles all adduct the thigh These three groups are enclosed by the fascia lata
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30 The sole extensor of the knee is the quadriceps femoris The hamstring muscles flex the knee, and are antagonists to the quadriceps femoris
31 A deep fascia of the leg is continuous with the fascia lata This fascia segregates the leg into three compartments: anterior, lateral, and posterior Distally, the fascia thickens and forms the flexor, extensor, and fibular retinaculae
32 These muscles are the primary toe extensors and ankle dorsiflexors They include the tibialis anterior, extensor digitorum longus, extensor hallucis longus, and fibularis tertius
33 These muscles primarily flex the foot and the toes They include the gastrocnemius, soleus, tibialis posterior, flexor digitorum longus, and flexor hallucis longus
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