| Flap 1 |
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| Flap 2 |
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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 |
| 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 |
| 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 |
| Q The SC joint mimics what type of joint? |
A Ball and socket |
| Q This structure found in the SC joint affords it extra strength and shock absorption |
A Fibrous Articular Disk N419 |
| 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 |
| Q What kind of joint is the AC joint? |
A plane (diarthrotic) |
| Q T/F the interarticular disc in the AC joint is complete.*** |
A FALSE, the interarticular disc is incomplete in the AC joint*** N423 |
| Q This ligament in the AC joint protects the supraspinatous m. |
A The coracoacromial lig N423 |
| Q This ligament has two parts, and holds up the scap |
A The coracoclavicular ligament N423. |
| 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. |
| Q What does coracoid mean in latin? |
A crows beak |
| Note: Intrinsic lig's refer to capsules and discs |
Note: Extrinsic lig's refer to lig's outside of the capsule/disc |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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. |
| 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 |
| Q Does the infraspin m. originate from the edge of the infraspin fossa? |
A NO, the origin is from the WHOLE fossa |
| 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. |
| Q What direction would the supraspin m. rotate the humerus? |
A medially |
| 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. |
| 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. |
| 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 *** |
| Q What vessel accompanies the axillary n. as it passes through the quadrangular space? *** |
A Pos humeral circumflex a. *** |
| Q What BV does the pos humeral circumflex a. branch off of? Be specific. |
A The THIRD part of the axillary a. N427 |
| 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*** |
| 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. |
