Module 5.2 Part 1 - Muscles of Upper Extremities Flashcards
Where is the trapezius located relative to the other muscles?
superficial to
trapezius
Origin: occipital bone, spinous processes of T1-T12
Insertion: lateral clavicle, acromion, and scapula spine of scapula
Action: rotation, retraction, elevation, and depression of scapula + extends neck and stabalizes shoulder
Innervation: Accessory Nerve (CN XI)
levator scapulae
Origin: transvere process of C1-C4
Insertion: medial border of scapula
Action: elevates scapula
Innervation: dorsal scapular nerve
rhomboids (major, minor)
Origin: spinous process (C7-T1 minor)(T2-T5 major)
Insertion: medial border of scapula
Action: scapular retraction
Innervation: dorsal scapular nerve
pectoralis minor
Origin: ribs 3-5
Insertion: coracoid process of scapula
Action: elevates ribs, draws scapula down and medially
Innervation: medial pectoral nerve
serratus anterior
Origin: upper 8 or 9 ribs
Insertion: medial border of the scapula
Action: protraction of scapula
Innervation: long thoracic nerve
deltoid (anterior, posterior, middle)
Origin: clavicle and scapula
Insertion: deltoid tuberosity of humerus
Action: aduction at shoulder (whole muscle)
Innervation: axillary nerve
pectoralis major
Origin: ribs 2-6, body of sternum
Insertion: greater tubercle of humerus
Action: flexion, adduction, and meidal rotation at shoulder
Innervation: pectoral nerves
supraspinatus
Origin: supraspinatus fossa of scapula
Insertion: greater tubercle of humerus
Action: abduction at shoulder
Innervation: suprascapular nerve
infraspinatus
Origin: infraspinatus fossa of scapula
Insertion: greater tubercle of humerus
Action: lateral rotation of shoulder
Innervation: suprascapular nerve
teres minor
Origin: lateral border of scapula
Insertion: greater tubercle of humerus
Action: lateral rotation of shoulder
Innervation: axillary nerve
teres major
Origin: inferior angle of scapula
Insertion: intertubercular groove of humerus
Action: extension, adduction, and medial rotation at shoulder
Innervation: lower subscapular nerve
subscapularis
Origin: subscapular fossa
Insertion: lesser tubercle of humerus
Action: medial rotation at shoulder
Innervation: subscapular nerves
latissimus dorsi
Origin: spinous process of inferior thoracic and lumbar vertabrae, ribs 8-12
Insertion: intertubercular groove of humerus
Action: extension, adduction, and medial rotation at shoulder
Innervation: thoracodorsal nerve
coracobrachialis
Origin: coracoid process
Insertion: medial shaft of humerus
Action: adduction and flexion at shoulder
Innervation: musculocutaneous nerve
biceps brachii
Origin: short head - coracoid process; long head - supraglenoid tubercle of scapula
Insertion: tuberosity of radius
Action: flexion at elbow and shoulder, supination
Innervation: musculocutaneous nerve
brachialis
Origin: anterior/distal surface of humerus
Insertion: tuberosity of ulna
Action: flexion at elbow
Innervation: musculocutaneous nerve and radial nerve
brachioradialis
Origin: lateral epicondyle of humerus
Insertion: lateral aspect of styloid process of radius
Action: flexion at elbow
Innervation: radial nerve
triceps (long head, lateral head, medial head)
Origin: Long head – infraglenoid tubercle of scapula; Lateral head – superior, lateral margin on humerus; Medial head – posterior surface of humerus
Insertion: olecranon of ulna
Action: extension at elbow
Innervation: radial nerve
pronator teres
Origin: medial epicondyle of humerus
Insertion: mid-lateral surface of radius
Action: pronation
Innervation: median nerve
supinator
Origin: lateral epicondyle of humerus
Insertion: anterolateral surface of radius
Action: supination
Innervation: deep radial nerve
Flexor carpi radialis
Action: wrist flexion, radial deviation of the hand
Innervation: median nerve
Palmaris longus
Action: wrist flexion
Innervation: median nerve
Flexor carpi ulnaris
Action: wrist flexion, ulnar deviation of the hand
Innervation: ulnar nerve
Flexor digitorum superficialis(FDS)
action: flexion of the wrist and digits 2-5 (middle & proximal phalanx)
Flexor pollicis longus
Action: flexion of thumb
Innervation: median nerve
Flexor digitorum profundus (FDP)
Action: wrist flexion, flexion of digits 2-5 (distal phalanx)
Innervation: palmar interosseous nerve
Extensor carpi radialis longus
Action: extension, abduction of the wrist
Innervation: radial nerve
Extensor carpi radialis brevis
Action: extension, abduction of the wrist
Innervation: radial nerve
Extensor digitorum
Action: wrist extension, extension of digits 2-5
Innervation: deep radial nerve
Extensor digiti minimi (digit 5)
Action: wrist extension, extension of digit 5
Innervation: deep radial nerve
Extensor carpi ulnaris
Action: extension, adduction of the wrist
Innervation: deep radial nerve
Abductor pollicis longus (APL)
Action: abduction of wrist and thumb
Innervation: deep radial nerve
Extensor pollicis longus (EPL)
Action: thumb extension, wrist abduction
Innervation: deep radial nerve
Extensor pollicis brevis (EPB)
Action: thumb extension, wrist abduction
Innervation: deep radial nerve
Extensor indicis (EI)
Action: extension of wrist and digit 2
Innervation: deep radial nerve
