3 Questions What are the three types of muscle contractions in the body? How can you remember which muscles move a specific joint?What happens to the muscles at a specific joint during each type of muscle contraction?Hint: choose a joint, then figure out the muscles that move it and the movements it makes. Then, apply this knowledge to each type of muscle contraction.
4 Posterior View of Back Levator Scapulae Rhomboid Minor Supraspinatus InfraspinatusTeres MinorLatissimus dorsiRhomboid Major
5 Motions of Muscles Trapezius Latissimus Dorsi Rhomboids Scapular elevation, adduction, retraction, upward rotation and depression, also extends neckLatissimus DorsiAdductor, extensor & internal rotator of armRhomboidsAssist trapezius in downward rotation of the scapula and adduction or retraction of scapulaLevator ScapulaeElevates the scapula and helps rotate the scapula downward
6 Muscles of the Rotator Cuff SupraspinatusTeres minorInfraspinatusShow scapula!Subscapularis - Sits on anterior side of Scapula
7 Motions of Muscles for Rotator Cuff SupraspinatusAbducts the shoulderInfraspinatusLaterally Rotates the ShoulderTeres MinorLaterally rotate the shoulderSubscapularisRotates humerus medially, stabilizes the shoulderAll three of these muscles help stabilize the shoulder joint
8 Muscles that Move the Humerus Deltoid (anterior and lateral heads)Pectoralis MajorCoracobrachialis
9 Motions of Muscles Deltoid Coracobrachialis Teres Major Anterior HeadFlexes and medially rotates the shoulder jointLateral HeadAbducts the armPosterior HeadExtends and laterally rotates the armCoracobrachialisActs as a flexor and adductor of the armTeres MajorMedial rotator, adductor and helps extends the humerus at the armPectoralis MajorInternal rotation, adduction and flexion of the arm
10 Muscles that Move the Humerus – cont’d CoracobrachialisPectoralis minorSerratus anterior
11 Motions of Muscles Pectoralis Minor Serratus Anterior Elevates the ribs and depresses and protracts the scapulaSerratus AnteriorUpward rotation, abduction or protraction of the scapula
20 Motions of MusclesUsing the wrist as an example, deduce the muscles that are responsible for the movements that happen around that joint.What are the movements around the wrist?FlexorsFlexes hand and wristAdducts and abducts wristExtensorsExtends hand and wristAdducts and abducts wrist
21 Muscle Contractions What are the 3 types of muscle contractions? Concentric (___________)Ex. Bicep shortens when lifting an objectEccentric (____________)Ex. Bicep lengthens when putting same object downIsometric (________)When trying to lift an immovable object!
22 Back to the Questions:What are the three types of muscle contractions in the body?How can you remember which muscles move a specific joint?What happens to the muscles at a specific joint during each type of muscle contraction?
23 Antagonist vs. Agonist Muscles How do muscles work together in the human body?One muscles (extensor) is required to move the bone in the opposite direction and stretches opposite the muscle (flexor)The flexor and extensor in this case are described as anatagonistic muscles
24 Antagonist vs. Agonist Muscles The muscle primarily responsible for movement of a body partAntagonist MuscleMuscle that contracts the agonist, lengthening when the agonist muscle contracts
25 Antagonistic PairsWhat are some example of Antagonist and Agonist muscles in the upper limb?Biceps Brachii and Triceps BrachiiWhen you Flex your Biceps, your triceps extendsDeltoid and Latissimus DorsiWhen you abduct your shoulder your deltoid flexes and your latissimus dorsi extendsWrist flexion – Flexor Carpi radialis and extensor carpi radialis