Upper Limb - Muscles

ridugeru's version from 2017-10-30 20:00

Section 1

Question Answer
Trapezius - originsuperior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of C7-T12
Trapezius - insertionlateral third of clavicle; acromion; spine of scapula
Trapezius - innervationCN XI (accessory n); C3 + C4 for propioreception
Trapexius - actionRotates scapula; upper fibers elevate; middle fibers retracts; lower fibers depress

Section 2

Question Answer
Latissimus dorsi - originSpinous processes of T6-L5 and sacrum; iliac crest; ribs 10-12
Latissimus dorsi - insertionintertubercular sulcus of humerus
Latissimus dorsi - innervationThoracodorsal nerve (C6-C8)
Latissimus dorsi - actionExtends, adducts and medially rotates the humerus

Section 3

Question Answer
Levator scapulae - originTransverse processes of C1 to C4
Levator scapulae - insertionUpper medial border of scapula
Levator scapulae - innervationC3,C4 and Dorsal scapular nerve (C4,C5)
Levator scapulae - actionelevates scapula

Section 4

Question Answer
Rhomboid major and minor - originligamentum nuchae and spinous processes of C7 to T5
Rhomboid major and minor - insertionmedial border of scapula
Rhomboid major and minor - innervationDorsal scapular nerve (C4,C5)
Rhomboid major and minor - actionadducts, elevates and rotates scapula

Section 5

Question Answer
Deltoid - originspine of scapula; acromion; lateral third of the clavicle
Deltoid - distal attachmentdeltoid tuberosity of the humerus
Deltoid - innervationaxillary nerve (C5, C6)
Deltoid - actionabducts humerus (15-90 degrees abduction of arm) anterior: flexion of humerus Posterior extension

Section 6

Question Answer
Supraspinatus - proximalsupraspinous fossa
Supraspinatus - distalupper facet of greater tubercle of humerus
Supraspinatus - innervationsuprascapular nerve (C5, C6)
Supraspinatus - actionabducts rotator cuff (below 15 degrees) holds humeral head in socket

Section 7

Question Answer
Infraspinatus - proximalinfraspinous fossa
Infraspinatus - distalmiddle facet of greater tubercle of humerus
Infraspinatus - innervationsuprascapular nerve (C5,C6)
Infraspinatus - actionlateral rotation of humerus

Section 8

Question Answer
Teres minor - proximalupper 2/3 of the lateral border of scapula
Teres minor - distallower most of the 3 facets of the greater tuberosity of humerus
Teres minor - innervationaxillary nerve (C5, C6)
Teres minor - actionadduct and lateral rotation of humerus

Section 9

Question Answer
Teres major - proximalraised oval area at the dorsal aspect of the inferior angle. lateral border of scapula
Teres major - distalmedial lip of the intertubercular groove
Teres major - innervationlower subscapular nerve (C5-C7)
Teres major - actionadducts and medially rotates and extension of shoulder

Section 10

Question Answer
Long head of Triceps - proximalinfraglenoid tubercle of the scapula
Long head of Triceps - distalproximal end of olecranon of ulna and fascia of forearm
Long head of Triceps - innervationradial nerve (C6-C8)
Long head of Triceps - actionforearm extension; adduction and extension of arm. resists dislocation

Section 11

Question Answer
Subscapularis - proximalsubscapular fossa of the scapula
Subscapularis - distallesser tubercle of humerus
Subscapularis - innervationupper and lower subscapular nerve (C5-C7)
Subscapularis - actionmedial rotation of arm. part of rotator cuff. holds head of humerus in glenoid cavity

Section 12

Question Answer
Pectoralis major - originanterior, medial half of clavicle; anterior surface of sternum; costal cart 1-7; rib 6; aponeurosis of external oblique
Pectoralis major - insertionintertubercular sulcus of humerus (lateral lip)
Pectoralis major - innervationmedial and lateral pectoral nerves (C5-T1)
Pectoralis major - actionflexion, adduction and medial rotation of humerus; extension of flexed arm (sternocostal part only)

Section 13

Question Answer
Pectoral minor - originanterior surfaces and superior border of ribs 3-5
Pectoral minor - insertioncorocoid process of scapula
Pectoral minor - innervationmedial pectoral nerve (C6-C8)
Pectoral minor - actioninferior rotation of scapula (=rotates glenoid fossa inferiorly); protracts scapula

Section 14

Question Answer
Serratus anterior - originsurface of upper 8 or 9 ribs and fascia of intercostal muscles
Serratus anterior - insertionmedial border of scapula
Serratus anterior - innervationlong thoracic nerve (C5-C7)
Serratus anterior - actionprotracts scapula; holds scapula to body wall

Section 15

Question Answer
Biceps - short head -origincorocoid process
Biceps - short head - insertionradial tuberosity and deep fascia of forearm
Biceps - short head - innervationmusculocutaneous nerve (C5, C6)
Biceps - short head - actionflexes arm and forearm; supinator of forearm when limb is bent at elbow

Section 16

Question Answer
Biceps - long head - originsupraglenoid tubercle
Biceps - long head - insertionradial tuberosity and deep fascia of forearm
Biceps - long head - innervationmusculocutaneous nerve (C5, C6)
Biceps - long head - actionflexes arm and forearm; supinator of forearm when limb is bent at elbow

Section 17

Question Answer
Coracobrachialis - origincorocoid process
Coracobrachialis - insertionmidshaft of humerus
Coracobrachialis - innervationmusculocutaneous nerve (C5-C7)
Coracobrachialis - actionflexes arm

Section 18

Question Answer
Brachialis - origindistal half of humerus
Brachialis - insertioncoronoid process and tuberosity of ulna
Brachialis - innervationmusculocutaneous nerve (C5-C7)
Brachialis - actionflexes forearm at elbow in all positions

Section 19

Question Answer
Anconeus - originlateral epicondyle of humerus
Anconeus - insertionlateral surface of olecranon
Anconeus - innervationRadial nerve (C5-C7)
Anconeus - actionassists triceps in extending elbow; abducts ulna during pronation