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38 Cards in this Set
- Front
- Back
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What are the thoracoappendcular mm.'s of the thoracic wall?
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1. pectoralis major
2. pectoralis minor 3. subclavius 4. serratus anterior |
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what do the thoraccoappendicular muscles act upon?
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they act upon the upper limbs
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What are the 9 accessory muscles of respiration?
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1. pectoralis major (only if you are in bad shape)
2. pectoralis minor (only if you are in bad shape) 3. serratus anterior 4. serratus posterior superior 5. serratus posterior inferior 6. levator costarum 7. external intercostals 8. internal intercostals (interosseous portion only, not interchondral--innermost intercostal) 9. transverse thoracic |
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Pectoralis major origin
-2 heads |
1. clavicular head: ant surface of medial 1/2 of clavicle
2. sternocostal head: ant surface of sternum, sup 6 costal cartilages, aponeurosis of ext oblique mm |
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Pectoralis major insertion
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lateral lip of intertubercular groove of humerus
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Pectoralis major action
1. entire mm. 2. clavicular head alone 3. sternocostal head alone |
1. adducts and medially rotates arm; draws scapula anteriorly and inferiorly
2. clavicular head alone: flexes humerus 3. sternocostal head alone: extends humerus from flexed position (contract inf pecs to pull arm back down) |
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Pectoralis minor origin
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ribs 3-5, near costal cart
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Pectoralis minor insertion
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med border and sup surface of coracoid process of scapula
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pectoralis minor action
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stabilizes scapula
-moves scapula inf and ant against thoracic wall |
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subclavius origin
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1st rib and costal cart
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subclavius insertion
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inf surface of middle 1/3 clavicle
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subclavius action
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anchors and depresses clavicle
(sternoclavicular joint >>ROM) |
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serratus anterior origin
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ext surface of lat parts of ribs 1-8
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serratus anterior insertion
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ant surface of medial border of scapula
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serratus anterior action
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-protracts and rotates scapula
-holds scapula against thoracic wall (like perctoralis minor) |
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When the ribs are pulled up, what happens to the diameter of the thoracic cavity?
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it is expanded
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When the ribs are pulled down, what happens to the diameter of the thoracic cavity?
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it is reduced
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serratus posterior superior
-superior attachment |
-nuchal ligament
-spinous process of C7-T3 |
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serratus posterior superior
-inferior attachment |
-sup border of ribs 2-4
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serratus posterior superior
-action |
-elevates ribs 2-4
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serratus posterior inferior
-superior attachment |
-spinous process of T11-L2
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serratus posterior inferior
-inferior attachment |
-inf border of ribs 8-12
(near angle) |
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serratus posterior inferior
-action |
-depress ribs 8-12
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levator costarum
-superior attachment |
-transverse process of T7-T11
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levator costarum
-inferior attachment |
-subadjacent ribs between tubercle and angle
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levator costarum
-action |
-elevate ribs
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external intercostals
-superior attachment |
-inf border of the ribs
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external intercostals
-inferior attachment |
-sup border of ribs below
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external intercostals
-action |
-elevate ribs (forced inspiration)
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internal intercostals
-superior attachment |
-inf border of the ribs
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internal intercostals
-inferior attachment |
-sup border of ribs below
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internal intercostals
-action |
-depresses ribs (forced expiration)
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transverse thoracic
-superior attachment |
-posterior surface of lower sternum
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transverse thoracic
-inferior attachment |
-internal surface of costal cart
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transverse thoracic
-action |
weakly depresses ribs
(at best b/c very short!!) |
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what accessory mm's of respiration run perpendicular to each other?
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external intercostals and internal intercostals
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if you can identify the transverse thoracic mm, then what else can you identify?
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the internal thoracic A and V
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definition of aponeurosis...
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thin sheets of fibrous CT that connect into a mm
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