Shoulder complex Flashcards
what are the axiohumeral muscles?
pectoral is major
latissimus dorsi
Pectoralis major (sternocostal head)
proximal attachment: sternum and 1st to 7th costal cartilages
distal attachment: lateral lip intertubercular sulcus of humerus
innervation: median and lateral pectoral nerves
action: extension, medial rotation, horizontal F
latissimus dorsi
proximal attachment: t7-12, lumbar and sacral spinous processes, posterior iliac crest, lower 3 ribs
distal attachment: inter-tubercular sulcus
innervation: thoracodorsal N c6-8
action: extension, adduction, medial rotation
pectoralis major clavicular head
proximal attachment: medial 2/3 clavicle
distal attachment: lateral lip intertubercle sulcus of humerus
innervation: medial and lateral pectoral nerves
action: F, medial rotation, horizontal F
What are the scapulohumeral muscles?
Deltoid, supraspinatus, infraspinatus, teres minor, subscapularis, teres major, coracobrachialis
Deltoid
proximal attachment: A = lateral 1/3 clavicle; M = acromion; P = spine of scapula
distal attachment = deltoid tuberosity
innervation = axillary N C5-C6
Action: A = F/ABD/hori F; M = ABD (F); P=E/hori E/ ADD
supraspinatus
proximal = supraspinous fossa of scapula
distal = greater tubercle of humerus
innervtion = suprascpaular N C5-6
action = GHJ abd and stabilisation
infraspinatus
proximal = Infraspinous fossa of scapula
distal = Greater tubercle of humerus
innervation = suprascapular n. c5,6
action = GHJ lateral rotation &
stabilisation
Subscapularis
proximal = Subscapular fossa
distal = lesser tubercle of humerus
innervation = upper & lower
subscapular N C5,6,7
action = GHJ medial rotation &
stabilisation
teres minor
proximal = Lateral dorsal
scapula
distal = greater tubercle
innervation = axillary N c5,6
action = GHJ lateral rotation &
stabilisation
teres major
proximal = Dorsal inferior
angle of scapula
distal = Medial lip
intertubercular
sulcus of humerus
innervation = lower subscapular N c5,6,7
action = GHJ medial rot’n, ADD,
E
corachobrachialis
proximal = coracoid process
distal = medial midshaft humerus
innervation = musculotaneous n. C5,6,7
action = GHJ F, ADD
What are the axioscapular and axioclavicular muscles?
sternocladiomastoid, trapezius
subclavius, levator scapulae, rhomboids, serratus anterior, pectoralis minor
trapzius
trapezius
upper = Medial superior nuchal
line & ligamentum
nuchae + Posterior border of
lateral clavicle. Action = Clavicular elevation;
scapular elev, Add,
upward rotation
middle = C7& T1 spinous
processes + Acromion & spine of
scapula. Action = Scapular
retraction/adduction
lower = T1-T12 spinous processes + Tubercle of spine of scapula. Action = Scapular depression &
upward rotation
innervation of all = accessory nerve
subclavius
proximal = 1st rib
distal = inferior middle third of clavicle
innervation = nerve to subclavius
actions = pulls clavicle medially
to stabilise SC joint
levator scapulae
proximal = C1-4 transverse processes
distal = medial border scapula
(above medial spine of
scapula)
innervation = C3,4 ventral rami
+ Dorsal scapular
N C5
action = Scapular elevation,
adduction & downward
rotation
rhomboid minor
proximal = Ligamentum nuchae, C7
& T1
distal = medial border scapula
(medial to spine of
scapula)
innervation = dorsal scapular n c5
action = Scapular elevation,
adduction & downward
rotation
rhomboid major
proximal = T2-5 spinous processes
distal = medial border scapula
(below spine of
scapula)
innervation = dorsal scapular n c5
action = Scapular elevation,
adduction & downward
rotation
serratus anterior
proximal = anterolateral ribs 1 to 9
distal = Medial, ventral border
of scapula
innervation = long thoracic c5,6,7
action = scapular protraction, abd, upward rotation
pec minor
proximal = anterior ribs 3-5
distal coracoid process
innervation = medial and lateral pectoral nerves
action = scapular anterior tilt
what spinous level does musculataneous nerve arise from
C5,6
what spinal level does median nerve arise from
C5,6 + C8-T1
what spinal level does radial nerve arise from
C7
what spinal level does ulanr nerve arise from
C8-T1
