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MUSCLE NAMES & MOVEMENT November 8, 2013. Rules of Muscle Movement 1. All muscles have at least two points of attachment. The origin is attached to the.

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Presentation on theme: "MUSCLE NAMES & MOVEMENT November 8, 2013. Rules of Muscle Movement 1. All muscles have at least two points of attachment. The origin is attached to the."— Presentation transcript:

1 MUSCLE NAMES & MOVEMENT November 8, 2013

2 Rules of Muscle Movement 1. All muscles have at least two points of attachment. The origin is attached to the less movable bone The insertion is attached to the more moveable bone. 2. Muscles can only contract / pull. They cannot push. 3. During contraction, the muscle insertion moves toward the origin. interactive animation! If muscles can’t push, how do we do the opposite movement? How do we extend the arm?

3 Rules of Muscle Movement 1. All muscles have at least two points of attachment. The origin is attached to the less movable bone The insertion is attached to the more moveable bone. 2. Muscles can only contract / pull. They cannot push. 3. During contraction, the muscle insertion moves toward the origin. interactive animation! Different muscles – called antagonists – do the opposite movement. Example: biceps flexes the elbow while the triceps extends the muscle.

4 Movements Flexion – a movement that decreases the angle between two bones, bringing them closer together. Extension – a movement that increases the angle between two bones, putting them farther apart. Hyperextension – extension of a joint beyond its normal range of motion

5 Movements abduction – movement of a limb away from the midline of the body. adduction – movement of a limb towards the midline of the body

6 Movements rotation – movement of a bone raround its longitudinal axis circumduction – the proximal end of a limb is stationary while the distal end moves in a circle

7 Movements of the foot dorsiflexion – lifting the foot so that its superior surface approaches the shin plantar flexion – pointing the toes inversion – turning sole medially eversion – turning sole laterally

8 Movements of radius and ulna supination – turning the palm so that it faces anteriorly mnemonic: cupping a bowl of soup in your palm pronation– turning the palm so that it faces posteriorly

9 Movements Work with a partner to come up with 5 ways to do each of the following movements: Flexion Extension Hyperextension Abduction Adduction circumduction

10 Types of Muscles Prime mover – muscle that has the major responsibility for a movement Antagonist – muscle that opposes / reverse a movement Muscles can be both a prime mover and an antagonist – of different motions. Example: MovementPrime moverAntagonist Elbow flexionBiceps brachiiTriceps brachii Elbow extensionTriceps brachiiBiceps brachii

11 Types of Muscles Prime mover – muscle that has the major responsibility for a movement Antagonist – muscle that opposes / reverse a movement Synergist – muscles that assist movement by also producing the motion or stabilizing joints and reducing unwanted movements. Ex: brachialis and brachioradialis are synergists of elbow flexion because they help the biceps

12 Types of Muscles Prime mover – muscle that has the major responsibility for a movement Antagonist – muscle that opposes / reverse a movement Synergist – muscles that assist movement by also producing the motion or stabilizing joints and reducing unwanted movements. Fixator – a type of synergist that stabilizes the origin of the prime mover, so that only the insertion moves. Example: the rotator cuff muscles of scapula are fixators for elbow flexion.

13 Muscle names, locations, & actions Muscles of the anterior face and neck NameOriginInsertionAction MasseterTemporal bonemandibleClose jaw TemporalisTemporal bonemandibleClose jaw SternocleidomastoidSternum & clavical Mastoid process of temporal bone Flexes neck & rotates head You don’t need to memorize origins and insertions – you do need to know where each is and what they do.

14 Muscle names, locations, & actions Muscles of the anterior trunk NameOriginInsertionAction Pectoralis major Sternum, clavicle, and first 6 ribs Proximal humerusAdducts and flexes humerus Rectus abdominis pubisSternum and ribs 5-7Flexes vertebral column External oblique Lower 8 ribsIliac crestFlexes & rotates vertebral column

15 Muscle names, locations, & actions Muscles of the posterior trunk NameOriginInsertionAction trapeziusOccipital bone, cervicle and thoracic vertebrae Scapular spine and clavicle Extends neck and adducts scapula Latissimus dorsi Lower spine and iliac crest Proximal humerusExtends and adducts humerus deltoidScapula and claviclehumerusAbducts humerus

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17 Muscle names, locations, & actions Muscles of the arm NameOriginInsertionAction Biceps brachii scapularadiusFlexes elbow and supinates forearm Triceps brachii Shoulder girdle and humerus ulnaExtends elbow

18 Muscle names, locations, & actions Muscles of the anterior hip and thigh NameOriginInsertionAction adductorpelvisfemurAdducts thigh sartoriusiliumtibiaFlex thigh quadricepsFemur and pelvistibiaFlex hip and extend knee

19 Muscle names, locations, & actions Muscles of the posterior hip and thigh NameOriginInsertionAction Gluteus maximusSacrum and iliumfemurExtends thigh Gluteus mediusiliumtibiaAbducts thigh hamstringsFemur and pelvistibiaExtend thigh and flex knee

20 Practice 1 Find as many examples as you can of prime mover – antagonist pairs in the muscles just listed Find as many synergist muscles as you can in the muscles just listed ~5 min

21 Practice 2 – fill in diagrams

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24 Practice 3 In groups of 4-6, play “Simon Says” using the new vocabulary (e.g. Simon says abduct your humerus; Simon says use your quadriceps group) Simon can use notes. Try to trick each other!

25 Closure What were our objectives, and what did you learn about them. How does what we did today address our unit question?

26 Exit Ticket Describe the motion of the sartorius and name a synergist and an antagonist


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