Scapular and Pectoral Regions

Question 0

Shoulder aka

Answer 0

pectoral girdle

Question 1

The shoulder is a lateral extension of the _______

Answer 1

neck

Question 2

The shoulder articulates with the arm via the

Answer 2

glenoid cavity

Question 3

The lateral articulation of the clavicle is the

Answer 3

acromioclavicular joint

Where scapula attaches to axial skeleton

Question 4

The glenohumeral joint is

Answer 4

a well encapsulated ball in socket joint

synovial membrane.. synovial fluid.. reduce friction

Question 5

subtendinous bursa of subscapularis

Answer 5

c

Question 6

deltoid muscle=

Answer 6

shoulder pads

assists rotator cuff

Question 7

teres major muscle=

Answer 7

lats little helper

assists rotator cuff

Question 8

What are the muscles of the rotator cuff?

Answer 8

Supraspinatus
Infraspinatus
Teres minor
Subscapularis
(SITS)

Question 9

origin and insertion of deltoid m?

Answer 9

o: lateral clavicle, acromion and spine of scapula
i: deltoid tuberosity of humerus (lateral surface)

Question 10

What is the action of the deltoid and what supplies it?

Answer 10

a: abducts humerus (primary) flexes, extends, and rotates humerus (secondary)
s: axillary nerve and posterior circumflex humeral vessels

Question 11

Teres major

Answer 11

o: inferior scapula
i: upper humerus

a: medially rotate and extend humerus
s; lower (inferior subscapular nerve and subscapular vessels

Question 12

supraspinatus muscle

Answer 12

muscle above scapular spine

o: supraspinous fossa
i; greater tubercle of humerus
a; abducts humerus (15 degrees)
s: suprascapular nerve and vessels and dorsal scapular vessels

Question 13

infraspinatus muscle

Answer 13

o: infraspinous fossa
i: greater tubercle of humerus
a: laterally rotates humerous
s: suprascapular nerves and vessels
subscapular nerves and vessels

Question 14

teres minor muscle

Answer 14

o: lateral border of scapula (looks like it dives deep to teres major and infraspinatous
i: greater tubercle of humerus
a: lateral rotation of humerus
s: axillary nerve, suprascapular and subscapular vessels

Question 15

subscapularis muscle

Answer 15

covers entire deep surface of scapula
(teres major beneath it from anterior)

o: subscapular fossa
i: lesser tubercle of humerus
a: medial rotation of humerus
s: supper and lower subscapular nerves and vessels

Question 16

The _________ provides outer muscular support for the shoulder region

Answer 16

deltoid

Question 17

___________ provides inner muscular support of shoulder region

Answer 17

rotator cuff

Question 18

The subacromial (subdeltoid) bursa is

Answer 18

a membranous sac containing lubricating synovial fluid

• protects supraspinatous tendon from friction
• does not communicate with joint capsule

Question 19

Subacromial (subdeltoid) bursa and attrition of the supraspinatus tendon

Answer 19

tendon degenerates in middle age - up to 1/4 of adults rupture by 65

• as it wears away, underlying joint capsule thins
• when capsule opens, continuous with bursa, painful shoulder with limited arm movement

Question 20

What are the spaces of the shoulder region?

Answer 20

quadrangular space
triangular space
triangular interval

Question 21

structures of the quadrangular space and borders

Answer 21

axillary nerve
posterior circumflex humeral vessels

teres minor=superior
teres major=inferior
long head of tricep = medial
surgical neck of humerus=lateral

Question 22

Triangular space

Answer 22

teres minor=superior
teres major=inferior
long head of tricep=lateral
contains: circumflex scapular vessels

Question 23

profunda also means

Answer 23

deep

profunda brachii means deep brachii

Question 24

triangular interval

Answer 24

teres major: superior
long head of triceps: medial
lateral head of tricep: lateral
contains: radial nerve and deep(or profundas) brachial artery

Question 25

Suprascapular Nerve and Artery

Answer 25

Nerve: ventral rami of C5-C6
-runs under supr. trans. scap. lig. thru suprascap notch (navy goes under the bridge)

Artery: thyrocervical trunk
- runs over the ligament (army goes over the bridge)

both: pass through spinoglenoid notch to infraspinatus fossa and supply supraspinatus and infraspinatus mm.

Question 26

Dorsal scapular nerve and artery

Answer 26

Nerve: ventral ramus of C5

Artery: From subclavian or deep trans. cervical
Both: run parallel to vertebral border of scapula and supply levator scapulae and rhomboid

Question 27

Accessory nerve and transverse cervical artery

Answer 27

nerve: brainstem (cn 11)
descends thru neck and joins artery

artery: thyrocervical trunk.. runs deep to trap

both supply trapezius

Question 28

Upper and lower subscapular nerve and subscapular artery

Answer 28

Nerve: posterior cord of brachial plexus
-ventral rami of c5 and 6

artery: axillary artery
- splits into thoracodorsal artery and circumflex scapular artery

all: supply subscapularis m (on anterior surface of scapula)
note: lower subscapular nerve and subscapular artery suppy teres major

Question 29

The subscapular artery comes of the _____ section of _______

Answer 29

3rd, axillary artery

Question 30

The extensive collateral circulation of the scapular region ensures:

Answer 30

adequate blood supply to UL

• in event of insufficient flow thru axillary a./ temporary ligation
• collateral circ. by thryrocervical trunk and subscapular a.