01/15
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| Q The subclavian m., which holds down the clavicle, inserts where? | A Subclavian groove on inf surface of the clavicle N419
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| Q Where does the costoclavicular ligament attach on the clavicle, and what action does it limit? | A It attaches to the costal tubercle on the proximal/inf aspect of the clavicle. It limits elevation N 419
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| Q Where does the coracoclavicular ligament attach to the clavicle? | A On the Conoid tubercle. This part of the ligament is cone shaped. Also on the trapezoid line. This part of the ligament is trapezoid(?) shaped. N423
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| Q The SC joint mimics what type of joint? | A Ball and socket
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| Q This structure found in the SC joint affords it extra strength and shock absorption | A Fibrous Articular Disk N419
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| Q Blood supply to the SC joint is provided by What 3 vessels?*** | A Internal thoracic artery, suprascapular a., and the thoracoacromial trunk *** N 427, 189
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| Q What kind of joint is the AC joint? | A plane (diarthrotic)
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| Q T/F the interarticular disc in the AC joint is complete.*** | A FALSE, the interarticular disc is incomplete in the AC joint*** N423
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| Q This ligament in the AC joint protects the supraspinatous m. | A The coracoacromial lig N423
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| Q This ligament has two parts, and holds up the scap | A The coracoclavicular ligament N423.
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| Q What are the two parts of the coraco-clavicular lig? | A Conoid in the shape of a cone, and the trapezoid with more of a rectangular shape.
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| Q What does coracoid mean in latin? | A crows beak
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| Note: Intrinsic lig's refer to capsules and discs | Note: Extrinsic lig's refer to lig's outside of the capsule/disc
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| Q The thoracoacromion trunk gives rise to what BV that is main blood supply to the AC joint? | A the acromion a. branches off the thoraco-acromion trunk. N427
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| Q Apart from the acromion a., what BV supplies the AC joint, and what does it branch off of? | A The suprascapular a. branches off of the thyrocervical trunk N 427
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| Q What innervates the subscapular m.? What cord of the brachial plexus are these (hint) from? | A The upper and lower subscapular nn., from the pos cord N430
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| Q Aside from medial rotation of the humerus, what is the action of the subscapularis m.? | A adduction, because it is located inf to the humeral axis of rotation
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| Q Where does the subscapularis m. insert? What does this insertion help form? | A On the med margin of the lesser tubercle of the humerus, contributing to the formation of the GH joint capsule. N425
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| Q What is the origin of the supraspinatous m.? | A The supraspinatous fossa of the scap, easy enough...BUT, it originates from the whole fossa, not just the edge
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| Q This m. inserts into the sup aspect of the greater tubercle of the humerus, AND contributes to the formation of the GH capsule. | A supraspinatous m.
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| Q The suprascapular n. is interesting as it branches off the sup trunk of the brachial plexus. Where does it go? | A from the sup trunk of the brachial plexus, it passes (ant to pos) through the suprascapular notch (that means under the suprascapular ligament), and then INTO the supraspinatous m. N 425-426
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| Q Does the infraspin m. originate from the edge of the infraspin fossa? | A NO, the origin is from the WHOLE fossa
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| Q This m. inserts into the med. aspect of the greater tubercle of the humerus, and contributes to the formation of the GH joint capsule. | A Infraspin. m.
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| Q What direction would the supraspin m. rotate the humerus? | A medially
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| Q Do you think theteres minor m. blends with the GH joint capsule? Where does this m. insert? | A Yes it does, and it inserts into the inf aspect of the greater tubercle of the humerus posteriorly.
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| Q The teres minor is innervated in part by the radial n., but mainly by what? | A By the axillary n., from the pos cord of the brachial plexus.
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| Q What structure does the axillary n. pass through on it's way to innervate the teres minor and deltoid mm.? *** | A The Quadrangular space ***
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| Q What vessel accompanies the axillary n. as it passes through the quadrangular space? *** | A Pos humeral circumflex a. ***
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| Q What BV does the pos humeral circumflex a. branch off of? Be specific. | A The THIRD part of the axillary a. N427
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| Q How will you tell apart the axillary n. and the pos humeral circumflex a. in lab? *** | A The BV is closer to the bone (lateral) and the n. is more medial***
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| Q The teres minor is the sup border and the teres major is the inf border of the quad space. What are the lat/med borders?*** | A Lat border = upper shaft of the humerus/lat head of the triceps m., and med border = long head of the triceps m.
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