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Muscle Organization

Lecture Unit 1

Arrangement of Fascicles Parallel, Convergent, Circular, Unipennate, Bipennate, Multipennate.
Parallel Fascicles Long axis run parallel. Ex. Rectus abdominis, Sartorius.
Convergent Fascicles Broad origin, converge towards insertion. Ex. Pectoralis major.
Circular Fascicles Concentric rings. Ex. Obicularis oris, Obicularis oculi.
Pennate Fascicles Short and obliquely attached. Unipennate: Extensor digitorum. Bipennate: Rectus femoris. Fibers come off both sides of the tendon. Multipennate: deltoid.
Naming Muscles Action: supinator. Body Region: Rectus femoris. Attachments: sternocleidomastoid. Orientation: external abdominal oblique. Shape/size: Gluteus maximus. #of Attachments: Triceps brachii
Brachial Muscles (4) Name, Origin, Insertion BICEPS BRACHII, Supraglenoid tubercle, coracoid pro, Radial tuberosity. BRACHIALIS, shaft -humerus, Coranoid pro. BRACHIORADIALIS, lateral supracondylar ridge, styloid pro-radius. TRICEPS BRACHII, infraglenoid tubercle & shaft of humerus, olecranon pro
Tendon Continuation of endomysium, perimysium, and epimysium.
Rotator Cuff Muscles (4) Name, Origin, Insertion SITS muscles! SUPRASPINATUS, supraspinous fossa, greater tubercle. INFRASPINATUS, infraspinous fossa, greater tubercle. TERES MINOR, lateral border of scapula, greater tubercle. SUBSCAPULARIS, subscapular fossa, lesser tubercle.
Intertubercular Groove Muscles (3) Pectoralis Major, Teres Major, Latissimus dorsi. "2 majors and a mus."
Pectoralis Major O & I O: Clavicle, sternum, ribs 2-6 I: Intertubercular groove
Teres Major O O: Lateral border & inferior angle of scapula I: Intertubercular groove
Latsissimus dorsi O O: Spinous processes of T7-T12, ribs 8-12, iliac crest, thoracolumbar fascia I: Intertubercular groove
Quadriceps Muscles (4) Rectus femoris, Vastus lateralis, Vastus intermedius, Vastus medialis.
Rectus femoris O O: Anterior inferior iliac spine I: Tibial tuberosity
Vastus lateralis O O: Greater trochanter & linea aspera I: Tibial tuberosity
Vastus intermedius O O: Shaft of femur I: Tibial tuberosity
Vastus medialis O: linea aspera & intertorchanteric line I: Tibial tuberosity
Hamstring Muscles (3) Origins and Insertions BICEPS FEMORIS, Ischial tuberosity & linea aspera, Head of fibula. SEMIMEMBRANOSUS, Ischial tuberosity, Medial condyle of tibia. SEMITENDINOSUS, Ischial tuberosity, Pes anserinus.
Agonist (Prime mover) Produces a particular movement. Does the majority of movement at a joint.
Antagonist Opposes the agonist.
Synergist Aids the prime mover.
Fixator A synergist that assists the agonist by stabilizing the joint at the origin. Ex. Elbow flextion agonist=biceps brachii. fixator=deltoid.
Muscular Dystrophy Inherited group of muscle disorders. Muscles enlarge, though muscle fibers atrophy. Most common and serious form is Duchenne. X-linked recessive gene. 1 in 3500 births. Mostly male. Lacks protein dystrophin.
Created by: punkaloo