Muscles: Origins, Insertions & Innervations

Question 1

Upper Trapezius

Answer 1

Origin: external occipital protuberance
Insertion: lateral 1/3 of the

Question 2

Serratus Anterior

Answer 2

Origin: ribs 1-8
Insertion: anterior surface of vertebral border of scapula

Question 3

Rhomboid minor

Answer 3

Origin: Spinous Process’s C7-T1
Insertion: root of spine of scapula

Question 4

Rhomboid major

Answer 4

Origin: spinous process’s T2-T5
Insertion: medial border of scapula from root of spine to inferior angle

Question 5

Supraspinatus

Answer 5

Origin: supraspinous fossa of scapula
Insertion: greater tubercle of humerus
Innervation: supra-scapular nerve

Question 6

Anterior deltoid

Answer 6

Origin: lateral 1/3 of clavicle
Insertion: deltoid tuberosity
Innervation: axillary nerve

Question 7

Posterior deltoid

Answer 7

Origin: spine of scapula
Insertion: deltoid tuberosity
Innervation: axillary nerve

Question 8

Middle deltoid:

Answer 8

Origin: acromion process of scapula
Insertion: deltoid tuberosity
Innervation: axillary nerve

Question 9

Teres major

Answer 9

Origin: inferior angle of scapula
Insertion: medial lip of bicipital groove
Innervation: inferior subscapular nerve

Question 10

Infraspinatus

Answer 10

Origin: infraspinous fossa of scapula
Insertion: greater tubercle
Innervation: suprascapular nerve

Question 11

Biceps brachii short head

Answer 11

origin: coracoid process of scapula
insertion: radial tuberosity
innervation: musculotcutaneous nerve (C5, C6)

Question 12

biceps brachii long head

Answer 12

origin: supraglenoid tubercle of scapula
insertion: radial tuberosity
innervation: musculotcutaneous nerve (C5, C6)

Question 13

triceps brachii long head

Answer 13

origin: infraglenoid tubercle of scapula
insertion: olecranon process of ulna

Question 14

triceps brachii lateral head

Answer 14

origin: proximal, posterior-lateral surface of humerus
insertion: olecranon process of ulna
innervation: radial nerve (C7, C8)

Question 15

triceps brachii medial head

Answer 15

origin: distal posterior surface of humerus
insertion: olecranon process of humerus
innervation: radial nerve (C7, C8)

Question 16

pronator teres

Answer 16

origin humeral head: medial aspect of humerus proximal to medial epicondyle
origing ulnar head: medial aspect of coronoid process of ulna
Insertion: middle of lateral surface of the radius
innervation: median nerve

Question 17

Flexor carpi ulnaris

Answer 17

origin humeral head: medial epicondyle
origin ulnar head: olecranon process
insertion: pisiform, hammate, and base of 5th metacarpal
innervation: ulnar nerve

Question 18

Flexor carpi radialis

Answer 18

origin: medial epicondyle
insertion: base of 2nd and 3rd metacarpal bones
innervation: median nerve

Question 19

palmaris longus

Answer 19

origin: medial epicondyle
insertion: palmar aponeurosis & flexor reticulum
innervation: median nerve

Question 20

Extensor carpi radialis longus:

Answer 20

origin: lateral supracondylar ridge of humerus
insertion: posterior surface of base of 2nd metacarpal
innervation: radial nerve

Question 21

Extensor carpi radialis brevis

Answer 21

origin: lateral epicondyle of humerus
insertion: posterior surface of base of 3rd metacarpal
innervation: radial nerve

Question 22

Extensor carpi ulnaris

Answer 22

origin: lateral epicondyle of humerus
insertion: base of 5th metacarpal
innervation: radial nerve

Question 23

Lumbricals

Answer 23

origin: felxor digitorum profundus tendons
insertion: extensor expansion on radial side
innervation: 1 & 2: median
3 & 4: ulnar

Question 24

Flexor Digitorum Superficialis

Answer 24

origin humeral head: medial epicondyle
origin ulnar head: coronoid process
origin radial head: proximal 1/2 anterior surface
insertion: sides of shaft of middle phalanges
innervation: median nerve

Question 25

Flexor Digitorum Profundus

Answer 25

origin: interosseus membrane, 3/4 anterior and medial surfaces of ulna, medial aspects of coronoid process of ulna insertion: palmer suface of base of distal phalanger 2-5 innervcation: median nerve digits 2-3 ulnar nerve digits 4-5

Question 26

Extensor digitorum

Answer 26

origin: lateral epicondyle insertion: extensor expansion digits 2-5 innervation: radial nerve

Question 27

Extensor indicis

Answer 27

origin: posterolateral surface of middle of 1/3 of ulnav& ineterosseus membrane insertion: extensor expansion of 2nd digit innervation: radial nerve

Question 28

Abductor Digiti minimi

Answer 28

origin: pisiform insertion: base proximal phalanx of 5th digit innervation: ulnar nerve

Question 29

Dorsal interossei

Answer 29

origin: adjacent sides of shafts of metacarpals insertion: extensor expansion innervation: ulnar nerve

Question 30

Palmar interossei

Answer 30

origin: 1st: 1st Palmar Interosseous: Ulnar side of palmar surface of the shaft of the 2nd metacarpal bone 2nd Palmar Interosseous: Radial side of palmar surface of the shaft of the 4th metacarpal bone 3rd Palmar Interosseous: Radial side of palmar surface of the shaft of the 5th metacarpal bone Insertion:1st Palmar Interosseous: Extensor Expansion Ulnar side of the base of the proximal phalanx the 2nd digit 2nd Palmar Interosseous: Extensor Expansion Radial side of the base of the proximal phalanx the 4th digit 3rd Palmar Interosseous: Extensor Expansion Radial side of the base of the proximal phalanx the 5th digit innervation: ulnar nerve

Question 31

Flexor pollicis brevis

Answer 31

origin lateral head: flexor retinaculum and trapezium origin medial head: trapezoid and capitate, ulnar size of 1st metacarpal bone insertion: radial side of base of proxima phalanx of thumb

Question 32

Extensor pollicis brevis

Answer 32

origin: posterior surface of distal radius and interosseus membrane insertion: base of posterior surface of distal phalanx of thumb innervation: radial nerve

Question 33

Extensor pollicis longus

Answer 33

origin: middle 1/3 of posterior ulna and interosseus membrane insertion: base of posterior surface of distal phalanx of thumb innervation: radial nerve

Question 34

abductor pollcis longus

Answer 34

origin: Middle 1/3 posterior surface of radius and ulna, interosseous membrane insertion: Radial side of the base of the 1st metacarpal innervation: radial nerve

Question 35

abductor pollicis brevis

Answer 35

origin: Flexor retinaculum, trapezium and scaphoid insertion: Radial side of the base of the proximal phalanx of the thumb innervation: median nerve

Question 36

Adductor pollicis

Answer 36

Origin: Transverse Head: anterior surface of the 3rd metacarpal Oblique Head: capitate and base of the 2nd and 3rd metacarpals Insertion: Ulnar side of the base of the proximal phalanx of the thumb Innervation: median nerve

Question 37

flexor pollicis longus

Answer 37

Origin: Anterior surface of the middle of the shaft of radius and interosseous membrane Insertion: Base of the anterior surface of the distal phalanx of the thumb Innervation: Median Nerve