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Muscles Flashcards

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0
Q

Pectoralis Major
Nerve
Action

A

Lateral and Medial Pectoral Nerves; Clavicular Head: C5, C6; Sternocostal Head: C7, C8, T1
Adducts and medially rotates humerus, draws scapula anteriorly
Alone: clavicular head flexes humerus; sternocostal: extends it from the flexed position

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1
Q

Pectoralis Major
Origin
Insertion
Parts

A

O: Clavicular Head: Anterior Surface of Medial half of clavicle, Sternocostal Head: Anterior surface of sternum, superior 6 costal cartilages, aponeurosis of external oblique muscle
Inserts: Lateral lip of intertubercular sulcus of humerus

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2
Q

Pectoralis Minor
Origin
Insertion

A

O: 3rd-5th ribs near their costal cartilages
I: Medial Border and Superior Surface of coracoid process of scapula

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3
Q

Pectoralis Minor
Nerve
Action

A

Medial Pectoral Nerve (C8, T1)

Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall

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4
Q

Subclavius
Origin
Insertion

A

Junction of 1st rib and its costal cartilage

inferior surface of middle third of clavicle

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5
Q

Subclavius
Nerve
action

A

Subclavian Nerve (C5, C6)

Anchors and depresses clavicle

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6
Q

Serratus Anterior
Origin
Insertion

A

External Surace of lateral parts of 1-8 ribs

Anterior surface of medial border of scapula

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7
Q

Serratus Anterior
Nerve
Action

A

Long Thoracic Nerve (C5, C6, C7)

Protracts scapula and holds against thoracic wall; rotates scapula

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8
Q

Trapezius
Origin
Insertion

A

medial third of superior nuchal line, EOP, nuchal ligament, spinous process C7-T12

Lateral third of clavicle, acromion and spine of scapula

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9
Q

Trapezius
Nerve
action

A

Spinal Accessory (CN XI), C3 C4

Elevation, depression and retraction

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10
Q

Latissimus Dorsi
Origin
Insertion

A

spinous process inferior 6 thoracic vertebrae, thoracolumbar fascia, illiac crest, inferior 3 or 4 ribs

floor of Intertubercular sulcus of humerus

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11
Q

Latissmus Doris
Nerve
action

A

Thoracodorsal Nerve (C6, C7, C8= Keep the lats great)

extends, adducts, medially rotates

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12
Q

Levator Scapulae
Origin
Insertion

A

Posterior tubercle of transverse process of C1-C4

medial border of scapula superior to the root of the spine

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13
Q

Levator Scapulae
Nerve
Action

A

Dorsal Scapular (C5) and Cervical (C3, C4)

elevates scapula, tilts glenoid cavity inferiorly

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14
Q

Rhomboid Minor
Origin
Insertion

A

Nuchal ligament, spinous process C7 T1 vertebrae

root of the spine of the scapula

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15
Q

Rhomboid Minor
Nerve
action

A

Dorsal Scapular (C4, C5)

retract scapula and rotate it to depress glenoid cavity, fix scapula to thoracic wall

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16
Q

Rhomboid Major
Origin
Insertion

A

Spinous process T2- T5

Inferior to the root of the spine of the scapula

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17
Q

Rhomboid Major
Nerve
Action

A

Dorsal Scapular (C4, C5)

retract scapula and rotate it to depress glenoid caivty fix scapula to thoracic wall

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18
Q

Deltoid
Origin
insertion

A

lateral third of clavicle, acromion and spine of scapula

deltoid tuberosity of humerus

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19
Q

Deltoid
nerve
action

A

Axillary nerve (C5, C6)
Clavicular: flex, medial rotation
Aromion: abducts
Spinal: extends laterally rotates

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20
Q

Supraspinatus
origin
insertion

A

Suprspinous Fossa of Scapula

Superior Facet of Greater Tubercle of Humerus

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21
Q

Supraspinatus
nerve
action

A

Suprascapular Nerve (C4,C5, C6)

initiates and assists deltoid in abduction acts with other rotator cuff muscles

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22
Q

Infraspinatus
origin
insertion

A

Infraspinous Fossa of Scapula

Middle Facet of Greater Tubercle of Humerus

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23
Q

Infraspinatus
nerve
action

A

Suprascapular (C4, C5, C6)

laterally rotates arm, help hold humeral head in glenoid cavity of scapula

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24
Teres Minior origin insertion
Middle Part of Lateral Border of Scapula Inferior Facet of Greater Tubercle of Humerus
25
Teres Minor Nerve Action
Axillary Nerve (C5, C6) laterally rotates arm, help hold humeral head in glenoid cavity of scapula
26
Teres Major Origin Insertion
Posterior surface of inferior angle of scapula Medial tip of Intertubercular Groove of humerus
27
Teres Major nerve action
Lower Subscapular Nerve (C5, C6) Adducts and medially rotates arm
28
Subscapularis Origin Insertion
Subscapular Fossa (most anterior surface of scapula) Lesser Tubercle of humerus
29
Subscapularis nerve action
Upper and Lower Subscapular Nerve (C5, C6, C7) Medially roates and adducts arm, helps hold humeral head in glenoid cavity
30
Biceps Brachii origin insertion parts
Short: tip of coracoid process of scapula Long: Supraglenoid tubercle of scapula Tuberosity of radius and fascia of forearm via bicipital aponeurosis
31
Biceps Brachii Nerve action
Musculocutaneous (C5, C6) Supinates forearm, flexes forearm, flexes arm, resists dislocation of shoulder
32
Brachialis origin insertion
distal half of anterior surface of humerus coronoid process and tuberosity of ulna
33
Brachialis nerve action
Musculocutaneous Nerve (C5, C6) flexes forearm in all positions
34
Coracobrachialis origin insertion
tip of coracoid process of scapula middle third of medial surface of humerus
35
Coracobrachialis nerve action
Musculocutaneous Nerve (C5, C6, C7) helps flex and adduct arm, resist dislocation
36
Triceps Brachii origin head
Long Head: Infraglenoid tubercle of scapula Lateral Head: posterior surface of humerus, superior to radial groove Medial Head: posterior surface of humerus, inferior to radial groove
37
Triceps Brachii insertion nerve
proximal end of olecranon of ulna and fascia of forearm Radial Nerve (C6, C7, C8)
38
Triceps Brachii action
Chief extensor of forearm, Long had extends arm and resists dislocation of humerus
39
Anconeus origin insertion
Lateral epicondyle of humerus Lateral surface of olecranon and superior part of posterior surface of ulna
40
Anconeus nerve action
Radial Nerve (C7, C8, T1) assists tricep in extending forearm; stabilizes elbow joint; abducts ulna during pronation
41
Superficial (first) layer of Anterior Compartment of Forearm
Pronator Teres (PT) Flexor Capri Radialis (FCR) Palmaris Longus Flexor Carpi Unlaris (FCU): Humeral head, Ulnar Head
42
Intermediate (second) layer of anterior compartment of forearm
Flexor Digitorum Superficialis (FDS)
43
Deep (third) layer of anterior compartment of forearm
Flexor Digortum Profundus (FDP) Flexor Policis Longus (FPL) Pronator Quadratus
44
Pronator Teres (PT) origin insertion
Ulnar Head: coronoid process of ulna Humeral Head: medial epicondyle of humerus Middle of convexity of lateral surface of radius
45
Pronator Teres Nerve Action
Median Nerve (C6, C7) Pronates and Flexes forearm
46
Flexor Carpi Radialis (FCR) origin insertion
Medial epicondyle of humerus base of 2nd (3rd) metacarpal
47
Flexor Carpi Radialis (FCR) nerve action
Median Nerve (C6, C7) flexes and abducts hand
48
Palmaris Longus origin insertion
medial epicondyle of humerus distal half of flexor retinaculum, palmar aponeurosis
49
Palmaris Longus nerve action
Median Nerve (C7, C8) flexes hand and tenses palmar aponeurosis
50
Flexor Carpi Ulnaris (FCU) origin insertion
Olecranon and posterior border Pisiform, hook of hamate, 5th metacarpal
51
Flexor Carpi Ulnaris (FCU) nerve action
Ulnar Nerve (C7, C8) Flexes and ADucts hand
52
Flexor Digitorum Superficialis (FDS) origin insertion
Humero-Ulnar head: medial epicondyle of humerus and coronoid process of ulna Radial Head: oblique line of radius shafts of middle phalanges of medial 4 digits
53
Flexor Digitorum Superficialis (FDS) nerve action
Median Nerve (C7, C8, T1) flexes proximal interphalangeal joints of middle 4 digits, acting more strongly: flexes proximal phalanges at metacarpophalangeal joints
54
Flexor Digitorum Profundus (FDP) origin insertion
proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane bases of distal phalanges of 2, 3,4 and 5 digits
55
Flexor Digtorum Profundus (FDP) nerve action
Lateral part: Median Nerve (C8, T1) Medial Part: Ulnar Nerve (C8, T1) flexes distal and interphalangeal joints of digits 2, 3, 4, and 5; assist with wrist flexion
56
Flexor Pollicis Longus (FPL) origin insertion
anterior surface of radius and adjacent interosseous membrane base of distal phalanx of thumb
57
Flexor Pollicis Longus (FPL) nerve action
Anterior interosseous nerve from Median Nerve (C8, T1) flexes phalanges of 1st digit
58
Pronator Quadratus origin insertion
Distal Quarter of anterior surface of ulna distal quarter of anterior surface of radius
59
Pronator Quadratus nerve action
Anterior Interosseous Nerve from Median Nerve (C8, T1) pronates forearm, deep fibers bind radius and ulna together
60
Superficial Layer of Posterior Muscle Compartment of Foream
``` Brachioradialis Extensor Carpi Radialis: Longus, Brevis Extensor Digitorum Extensor Digiti Minimi Extensor Carpi Ulnaris ```
61
Deep Layer of Posterior Muscle Compartment of Forearm
Supinator
62
"Outcropping" Muscles of deep layer
ABductor Pollicis Longus Extensor Pollicis Longus Extensor Pollicis Brevis Extensor Indicis
63
Brachioradialis Origin insert
Proximal 2 thirds of lateral supra-epicondylar ridge of humerus lateral surface of distal end of radius proximal to styloid process
64
Brachioradialis nerve action
Radial Nerve (C5, C6, C7) relatively weak flexion of forearm, maximal when forearm is in midpronated position
65
Extensor Carpi Radialis Longus origin insert
lateral supra-epicondylar ridge of humerus dorsal aspect of base of 2nd metacarpal
66
Extensor Carpi Radialis Longus nerve action
Radial Nerve (C6, C7) Extend and ABduct hand at the wrist joint, extensor carpi radialis brevis active during fist clenching
67
Extensor Carpi Radialis Brevis origin insertion
lateral epicondyle of humerus dorsal aspect of base of 3rd metcarpal
68
Extensor Carpi Radial Brevis nerve action
Deep Branch of Radial Nerve (C7, C8) extend aBduct hand at the wrist joint; extensor carpi radialis brevis active during fist clenching
69
Extensor Digitorum origin insert
lateral epicondyle of humerus extensor expansions of medial 4 fingers
70
Extensor Digitorum nerve action
Posterior Interosseous nerve (C7, C8), continuation of deep branch of radial nerve extends medial 4 fingers primarily at metacarpophalangeal joints, secondarily at interphalangeal joints
71
Extensor Digitorum Minimi origin insertion
lateral epicondyle of humerus extensor expansion of 5th finger
72
Extensor Digitorum Minimi nerve action
posterior interosseous nerve (C7, C8) continuation of deep branch of radial nerve extends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint
73
Extensor Carpi Ulnaris origin insert
lateral epicondyle of humerus; posterior border of ulna via a shared aponeurosis dorsal aspect of base of 5th metacarpal
74
Extensor Carpi Ulnaris nerve action
posterior interosseous nerve (C7, C8) extends and ADducts hand at wrist joint
75
Supinator origin insert
lateral epicondyle of humerus; radial collateral and anular ligament; supinator fossa, crest of ulna lateral posterior and anterior surfaces of proximal third of radius
76
Supinator nerve action
Deep Branch of Radial Nerve (C7 C8) supinates forearm, rotates radius to turn palm anteriorly or superiroly
77
ABductor Pollicis Longus origin insert
posterior surface of proximal havles of ulna, radius and interosseous membrane base of 1st metacarpal
78
ABductor Pollicis Longus nerve action
Posterior Interosseous Nerve (C7, C8) abducts thumb and extends it at carpometacarpal joint
79
Extensor Pollicis Longus origin action
posterior surface of middle third of ulna and interosseous membrane dorsal aspect of base of distal phalanx of thumb
80
Extensor Pollicis Longus nerve action
posterior interosseous nerve (C7, C8) extends distal phalanx of thumb at interphalangeal joint, extends metacarpophalangeal and carpometacarpal joint
81
Extensor Pollicis Brevis origin insert
posterior surface of distal third of radius and interosseous membrane dorsal aspect of base of proximal phalanx of thumb
82
Extensor Pollicis Brevis nerve action
posterior interosseous nerve (C7, C8) extends proximal phalanx of thumb at metacarpophalngeal joint; extends carpometacarpal joint
83
Extensor Indicis origin insert
posterior surface of distal third of ulna and interosseous membrane extensor expansion of 2nd finger (pointer finger)
84
Extensor Indicis nerve action
posterior interosseous (C7, C8) extends 2nd finger; helps extend hand at wrist

Upper Limb Muscles (3 decks)

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