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.
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