Muscles Of The Shoulder Flashcards
Deltoid
O: lateral one third of the clavicle, acromion process, and spine of the scapula
I: deltoid tuberosity
A: abducts shoulder (all fibres)
N: axillary nerve C5-C6
Pectoralis major pg 100
O: medial clavicle, sternum, and costal cartilage of ribs
I: lateral lip of the bicipital groove of the humerus
A: flexes the shoulder
-extends the shoulder
-adducts the shoulder from below shoulder height
-internally rotates the shoulder
-horizontally adducts the shoulder
N: medial and lateral pectoral nerves
Coracobrachialis pg 102
O: coracoid process of the scapula
I: medial shaft, middle 1/3 of the humerus
A: flexes and adducts the shoulder
N: musculocutaneous
Biceps brachii pg 103
O: supraglenoid tubercle of the scapula (long head)
Coracoid process of scapula (short head)
I: radial tuberosity
A: flexes, abducts (long head) adducts (short head) the shoulder
-flexes and supinates the forearm
N: musculocutaneous C5-C6
Trapezius: pg 106
O: fkn everywhere man
A: extends and laterally flexes the head and neck
-rotates head and neck
-retract the scapula
-depresses and upwardly rotates the scapula
N: accessory nerve C3-C4
Rhomboid major and minor pg 109
O: spinous process C7-T1 (minor)
O: spinous process T2-T5 (major)
I: medial border of scapula from the root of the spine to the inferior angle (both)
A: retracts, elevates, and downwardly rotates the scapula
N: dorsal scapular nerve C5
Latissimus dorsi pg 110
O: spinous process of T7-L5, posterior iliac crest and posterior sacrum
I: medial lip of bicipital groove of humerus
A: adducts, horizontally abducts, extends, and internally rotates the shoulder
N: thoracodorsal nerve C6-C6
Terres major
112
O: posterior surface of the inferior angle of the scapula
I: medial lip of the bicipital groove
A: adducts, extends, internally rotates the shoulder
N: lower subscapular nerve
Serratus anterior
113
O: lateral surfaces of upper 8 or 9 ribs
I: costal surface of medial boarder of the scapula
A: protracts, depresses, and upwardly rotates the scapula
-assists with force inspiration
N: long thoracic nerve
Supraspinatus
114
O: supraspinous fossa of the scapula
I: greater tubercle of the humerus
A: initiates abduction of the shoulder
N: suprascapular nerve
Infraspinatus
115
O: infraspinatas fossa of the scapula
I: greater tubercle of the humerus
A: externally rotates, extends, and horizontally abducts the shoulder
N: suprascapular nerve
Teres minor
116
O: superior lateral boarder of the scapula
I: greater tubercle of the humerus
A: externally rotates, extends, and horizontally abducts the shoulder
N: axillary nerve
Subscapularis
117
O: subscapular fossa of the scapula
I: lesser tubercle of the humerus
A: internally rotates the shoulder
N: upper and lower subscapular nerves
Triceps brachii
118
O: long head: infraglenoid tubercle of the scapula
O: lateral head: proximal 1/2 of posterior shaft of the humerus
O: medial head: distal 1/2 of posterior shaft of the humerus
I: olecranon process
A: extends and adducts the shoulder (long head)
Extends the elbow
N: radial nerve C5-T1
The four muscles that make up the rotator cuff are?
Supraspinatus
Infraspinatus
Subscapularis
Terres minor
