ANATOMY: Shoulder and upper arm Flashcards
what is the sister artery to the radial n.?
deep brachial a.
pectoralis minor innervation
what is this from?
medial and lateral pectoral nerves
lateral and medial cords of the brachial plexus
teres minor innervation
where does this come from off the brachial plexus?
axillary n.
terminal branch of the posterior cord
coracobrachialis innervation
where does this come from on the brachial plexus
musculocutaneus n.
a terminal branch of the lateral cord
triceps brachii innervation
where does this come from?
radial n.
comes from a terminal branch of the posterior cord
list the boundaries of the triangular space
contents?
teres major, minor, and long head of triceps
circumflex scapular a.
biceps brachii innervation
where does this come from on the brachial plexus?
musculocuteneus n.
terminal branch of the lateral cord.
what vessel and nerve runs beneath the trapezius?
accessory n.
superficial branch of the transverse cervical a.
innervation of teres minor
axillary n.
coracobrachialis
attachments, function
o: coracoid process
i: anteriomedial humerus
adduction of arm, flexes arm
innervation: pectorals major
where does this come from on the brachial plexus?
medial and lateral pectoral nerves
lateral and medial cords
supraspinatus
attachments, function
o: supraspinous fossa
a: greater tubercle (superior facet)
stabilized GHJ, ABDUCTION
serratus anterior:
attachments, function
O: ribs
I: medial border scapula (anterior)
Protracts, tilts glenoid up, hods scapula against thorax
innervation: levator scapulae
the nerve is a branch off of what?
dorsal scapular n.
C5 nerve root
latissimus dorsi
attachments, function
o: lower thoracic ad lumbar spinous processes, ilium
i: ANTERIOR inter tubercular groove humerus (middle facet)
F: Adduction arm, extension arm, medial rotation
innervation: latissimus dorsi
where does this come from?
thoracodorsal n.
from the posterior cord of the brachial plexus (middle sub scapular n.)
innervation of supraspinatus
suprascapular n.
innervation of trapezius
accessory n. (CN 11)
brachialis
attachments, function
o: anterior humerus
i: ulnar tuberosity
flexes forearm
attachments for supraspinales:
FUNCTION
supraspinous fossa —- greater tubercle humerus (superior facet)
ABDUCTION, stabilization GHJ
biceps brachii
attachments, function
o: coracoid, supraglenoid tubercle
i: radial tuberosity
flexes forearm, flexes arm weakly
SUPINATION
Impingement of suprascapular n. at ________ notch effects ___________ AND __________!
Impingement of suprascapular n. at __________ notch – yields atrophy of infraspinatus
scapular notch - suprasinatus, infraspinatus
spinoglenoid notch - infraspinatus
pectoralis minor
attachments
function
o: ribs
i: coracoid process of scapula
depresses scapula, protracts
supraspinatus innervation
where does this come from on the brachial plexus?
suprascapular n.
from the superior trunk (non-terminal branch)
list the boundaries of the quadrangular space
contents?
teres minor, teres major, long head of the triceps brachii, humerus
axillary n., posterior circumflex humeral a.
innervation: rhomboids major and minor
dorsal scapular n.
C5 nerve root
teres minor
attachments, function
o: inferior angle scapula
i: intertubercular groove of ANTERIOR humerus (most medial facet)
adduct arm, extend arm, medially rotate arm (mini latissimus dorsi)
pectorals major
attachments, function
o: sternum, clavicle
i: ANTERIOR inter tubercular groove (most lateral facet)
F: medial rotation arm, adducts arm, flexes arm (upper fibers), extends flexed arm (lower fibers)
subscapularis innervation
where does this come from on the brachial plexus?
upper and lower sub scapular nerve
from the posterior cord
rhomboids major and minor
attachments, function
o: spinous processes C7-T5
i: medial border of scapula
F: retract, elevate scapula, tilt glenoid down
deltoideus innervation.
where does this come from on the brachial plexus?
axillary n.
branch off the posterior cord
The axillary artery, axillary vein and brachial plexus pass posterior to ___________; any tightness or swelling of the muscle may result in ___________ syndrome
pectoralis minor
pectoralis minor syndrome
innervation of subscapularis
upper and lower subscapular n.
levator scapulae
attachments, function
o: cervical transverse processes
i: superior angle scapula
F: elevation of scapula, tilts glenoid down
deltoideus
attachments, function
o: spine of scapula, acromion, clavicle
i: deltoid tuberosity of humerus
ABDUCTION, upper fibers flex arm, lower fibers extend arm
innervation of infraspinatus
suprascapular n.
what artery runs with the long thoracic n.?
what main a. does this branch off of?
lateral thoracic a.
axillary a.
attachments teres minor:
FUNCTION
axillary border scapula — greater tubercle humerus (inferior facet)
lateral rotation, stabilization GHJ
infraspinatus
attachments, function
o: infraspinous fossa
i: greater tubercle, middle facet
laterally rotates arm, stabilizes GHJ
brachialis innervation
where does this come from on the brachial plexus?
musculocutaneus n.
terminal branch of the lateral cord
serratus anterior innervation. what is this from?
long thoracic nerve
nerve roots of C5-7
attachments infraspinales:
FUNCTION
infraspinous fossa — greater tubercle humerus (middle facet)
lateral rotation, stabilization GHJ
buddy artery to the suprascapular n.
where does this come from (main a.?)
suprascapular a.
branches off the subclavian a. and travels above the scapular ligament and notch
innervation: teres minor
where does this come from on the brachial plexus?
lower sub scapular n.
posterior cord
infrapinatus innervation
where does this come from off the brachial plexus?
suprascapular n.
comes off the superior trunk of the brachial plexus
what are the muscles of the rotator cuff?
supraspinales, infraspinalis, teres minor, subscapularis
triceps brachii
attachments, function
o: posterior humerus, infraglenous tubercle of scapula
i: olecranon process
extension of forearm, extension of arm (long head)
subscapularis
attachments, innervation
o: sub scapular fossa
i: lesser tubercle humerus
medial rotation of arm, stabilization of GHJ
attachments and functions
trapezius
o: skull, ligamentum nuchae, thoracic spinous processes
i: scapular spine, acromion, clavicle
a: elevates scapula, depresses scapula, retraction of scapula, rotates glenoid upwards
attachments subscapularis:
FUNCTION
subscapular fossa — lesser tubercle humerus
medial rotation, stabilization GHJ
