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Supraspinatus, Infraspinatus, teres minor, subscapularis
SITS stands for what? The hand positions represent the attachment points on the humerus.

CN XI
what is the nerve which innervates muscle 1?

C4-C5
What is the nerve which innervates muscle 2?

C4-C5
What is the nerve which innervates muscle 3?

C4-C6
what is the nerve which innervates muscle 4?

C5-C6
what is the nerve which innervates muscle 5?

C5-C6
what is the nerve which innervates muscle 6?

C6-C8
what is the nerve which innervates muscle 7?

infraspinatous
what is muscle 1?

teres minor
what is muscle 2?

subscapularis
what is muscle 3?

supraspinatus
what is muscle 4?

teres minor
what is image 5?

infraspinatus
what is image 6?

supraspinatus
what is image 7?

glenoid cavity
what is image 8?

Holds humerus head in glenoid cavity of the scapula
what is the function of the Teres minor, infraspinatus, supraspinatus, and the subscapularis?
proprioception
what is the most likely function of the serratus posterior?

serratus posterior superior
what is image 1?

serratus posterior inferior
what is image 2?

dorsal rami
the intrinsic back/epaxial muscles are innervated by the ... ...
splenius
the superficial layer of the deep back muscles is what?

erector spinae
the intermediate layer of the deep back muscles is what?

spinalis, longissimus, iliocostalis
what are the three erector spinae muscles from medial to lateral?

lateral flexion of the vertebral column
unilateral action of the erector spinae
extension of vertebral column
bilateral extension of the erector spinae
rotates head toward ipsilateral side
what action is unique to the longissimus capitis from the erector spinae muscles?

lateral felxion and rotation towards ipsilateral side of head and neck
unilateral actions of the splenius

extension of head and neck
bilateral action of the splenius

Common causes of shoulder pain
Repetitive use of arm above horizontal ( > 90 abduction) - tendons impinged on by bones. Irritation and inflammation of tendons -> degeneration (tendinitis, impingement, tear)
shoulder injuries lead to
lack of shoulder stability, difficulty controlling adduction, initiating abduction (supraspinatus)
glenohumeral dislocation
the inferior part of the joint capsule is the weakest - it is not reinforced by rotator cuff muscle

anterior dislocation
when the humeral head dislocates though inferior part of joint capsule, muscle may pull the humeral anteriorly and superiorly, often occurs when arm is abducted and externally rotated.
dorsal scapula artery
what is artery 1?

suprascapular artery
what is artery 2?

axillary artery
what is artery 3?

subscapular artery
what is artery 4?

circumcumflex scapular artery
what is artery 5?

thoracodorsal artery
what is artery 6?

Dont Stop Counting Turtles
Pneumonic for major arteries to the shoulder
dorsal scapular artery
thyrocervical trunk -> suprascapular artery
subclavian artery ->
subcapular artery -> cicumflex scapular artery
subcapular artery -> thoracodorsal artery
axillary artery ->
anastomoses
connects between blood vessels
dorsal scapular and suprascapular aa.
anastomoses of the supraspinous fossa

dorsal scapular, suprascapular and circumflex scapular aa.
anastomoses of the upper infraspinous fossa

dorsal scapular, circumflex scapular, thoracodorsal aa.
anastomoses of the lwer infraspinous fossa

dorsal scapular and thoracodorsal aa.
anastomoses of tthe subscapular fossa and the inferior angle

suprascapular artery
this artery is superficial to the superior transvernse scapular ligament, while the suprascapular nerve travels deep to ligament

Suprascapular artery and nerve
this a. and n. are deep to supraspinatus, around lateral border of the scapular spine, deep to infraspinatus

C7
vert level 1?

T1
vert level 2?

T1-T2
vert level 3?

T3
vert level 4?

T7
vert level 5?

T9
vert level 6?

L1-L2
vert level 7?

L4
vert level 8?

S2
vert level 9?

scapula
what is image 1?

clavicle
what is image 2?

levator scapulae
what is image 3?

deltoid
what is image 4?

rhomboid minor
what is image 5?

rhomboid major
what is image 6?

trapezius
what is image 7?

supraspinatus
what is image 8?

infraspinatus
what is image 9?

humerus
what is image 1?

clavicle
what is image 2?

subscapularis
what is image 3?

deltoid
what is image 4?

rhomboid major
what is image 5?

trapezius
what is image 6?

infraspinatus
what is image 7?
