Term
| what is the most frequently fractured bone in the body? |
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Definition
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Term
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Definition
"saddle" type synovial joint between clavicle and manubrium of sternum.
only TRUE articulation between upper limb and axial skeleton |
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Term
| SC joint is stabilized by? |
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Definition
anterior and posterior SC ligaments
interclavicular ligament
costoclavicular ligament - clavicle to 1st rib |
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Term
| what acts as a shock absorber when you fall on outstreched hand (FOOSH) |
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Definition
| intra-articular disc between clavicle and sternum |
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Term
| what acts as a shock absorber when you fall on outstreched hand (FOOSH) |
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Definition
| intra-articular disc between clavicle and sternum |
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Term
| what stabilizes the AC joint? |
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Definition
| acromioclavicular ligament, coracoclavicular ligaments (trapezoid ligament, conoid ligament) |
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Term
| AC dislocation (shoulder separation) - what happens by degree? |
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Definition
1st degree - sprain - AC ligament sprains
2nd degree - AC ligament breaks
3rd degree - AC and coracoclavicular ligaments break |
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Term
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Definition
adducts and medially rotates arm
flexes arm at shoulder joint
innervated by medial and lateral pec nerves |
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Term
| 4 muscles that adduct the arm? |
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Definition
| pectoralis major, teres major, lattissimus dorsi, subscapularis |
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Term
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Definition
from ribs to coracoid
stabilizes the scapula against the thoracic wall
innervated by medial pec nerve |
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Term
what does subclavian artery turn into and where?
what does the [next] artery turn into and where? |
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Definition
axillary, at the lateral border of the 1st rib
brachial, at the teres major |
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Term
| axillary artery gives off what 6 branches? |
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Definition
1st part --> superior thoracic artery
2nd part --> thoracoacromial trunk and lateral thoracic artery
3rd part --> subscapular, anterior humeral circumflex, posterior humeral circumflex |
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Term
| subscapular artery gives rise to? (2) |
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Definition
| thoracodorsal and scapular circumflex |
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Term
| anterior divisions of the brachial plexus form nerves that innervate what kind of muscles? |
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Definition
flexor (anterior) muscles
posterior divisions --> extensor (posterior) muscles |
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Term
| what are the subscapular nerves and what do they do? |
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Definition
upper and lower subscapular and thoracodorsal
adduct and medially rotate |
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Term
| roots of the plexus pass through which two muscles? |
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Definition
| anterior and middle scalene muscles, which attach to the cervical vertebrae and the first rib |
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Term
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Definition
| plexus has large C4 component and lacks T1 ('up' on spinal segment) |
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Term
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Definition
| plexus has large T2 component and lacks C5 ('down' on spinal segment) |
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Term
| intercostobranchial nerve |
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Definition
| only upper limb nerve NOT coming from the brachial plexus, it is a lateral cutaneous branch of the T2 intercostal nerve --> small area of sensation on medial arm |
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