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
Three muscles that extend the humerus are
Triceps brachii, deltoid and latissimus dorsi
Three muscles that externally rotate the humerus are?
Deltoid, infraspinatas, terres minor
Muscles involved in flexion of shoulder 4
Deltoid, pectoralis major, corocobrachialis, biceps brachii
4 muscles involved in extension of the shoulder
Deltoid, triceps brachii, latissimus Dorsi, pectoralis major (coastal fibres)
3 muscles involved in abduction of the shoulder
Deltoid, supraspinatus, pectoralis major
5 muscles involved in adduction of the shoulder
Biceps, corocobrachialis, latissimus dorsi, Teres major, pectoralis major
