Anatomy: Muscle Quiz #1

Front 1

Platysma

Back 1

origin (s):

1) deltoid
2) pectoralis major

insertion (s):

1) mandible
2) subcutaneous tissue and skin of lower part of face

action (s):

1) helps open the mouth
2) pulls skin toward the lower jaw

innervation (s):

1) facial nerve

Front 2

Sternocleidomastoid

Back 2

origin (s):

1) sternal head-manubrium
Clavicular head-clavicle

insertion (s):

1) Mastoid process
2) Superior nuchal line

action (s):

1) tilts and turns head from side to side
2) flexes the head

innervation (s):

1)accessory nerve

Front 3

Pectoralis Major

Back 3

origin (s):

1) Clavicle
2) Sternum

insertion (s):

1)intertubcular groove of the humerous

action (s):

1) flexion and extension
2) adduction and internal rotation of humerous

innervation (s):

1) Pectoral nerve

Front 4

Deltoid Muscle

Back 4

origin (s):

1) Clavicle
2) Acromion and spine of scapula

insertion (s):

1) deltoid tuberosity of humerous

action (s):

1) rotates and flexes or extends the humerous
2) abducts the humerous

innervation (s):

1) Axillary nerve

Front 5

Pectoralis Minor

Back 5

origin (s):

1) Superior margin of 3rd, 4th, and 5th ribs

insertion (s):

1) coracoid process of the scapula

action (s):

1) draws the scapula forward and downward (protraction)
2) lowers the lateral angle of the scapula (rotation)

innervation (s):

1) Medial pectoral nerve

Front 6

Subclavius

Back 6

origin (s):

1) Medial portion of 1st rib

insertion (s):

1) clavicle

action (s):

1) Depresses and pulls the lateral end of the clavicle forward

innervation (s):

1) brachial plexus

Front 7

Serratus Anterior

Back 7

origin (s):

1)outer surface and superior margins of the first eight or nine ribs

insertion (s):

1) medial border of the scapula

action (s):

1) draws the medial border of the scapula to the rib cage (prevents the scapula from 'winging')
2) helps in the upward rotation of the scapula

innervation (s):

1) Long thoracic

Front 8

Biceps Brachii

Back 8

origin (s):

1) glenoid cavity
2) coracoid process of the scapula

insertion (s):

1) tuberosity of the radius
2) fascia of the forearm

action (s):

1) supination and flexion of the forearm
2) flexion of the shoulder

innervation (s):

1) Musculocutaneous nerve

Front 9

Corabrachialis

Back 9

origin (s):

1) Coracoid process of the scapula

insertion (s):

1) Shaft of the humerous

action (s):

1) Flexion and adduction of the humerous

innervation (s):

1) Musculocutaneous nerve

Front 10

Brachialis

Back 10

origin (s):

1) lower half of the humerous

insertion (s):

1) Coronoid process of the ulna

action (s):

1) Flexion of the forearm

innervation (s):

1) Musculocutaneous nerve

Front 11

Brachioradialis

Back 11

origin (s):

1) Lateral supracondylar ridge

insertion (s):

1) Styloid process of the radius

action (s):

1) Flexion of the forearm

innervation (s):

1) Radial nerve

Front 12

Pronator Teres

Back 12

origin (s):

1) Humerous head- Medial epicondyle and supracondylar ridge
2) Ulnar head- Coronoid process

insertion (s):

1) Pronation and flexion of the forearm

action (s):

1) Medial nerve

innervation (s):

1)

Front 13

Flexor Carpi Radialis

Back 13

origin (s):

1) Medial epidcondyle of the humerous

insertion (s):

1) base of the second and third metacarpals

action (s):

1) Flexion and abduction (radial deviation) of the hand at the wrist
2) some flexion of the forearm

innervation (s):

1) Median nerve

Front 14

Palmaris Longus

Back 14

origin (s):

1) Medial epicondyle

insertion (s):

1) Flexor retinaculum
2) Palmar aponeurosis

action (s):

1) Flexes the wrist and the hand

innervation (s):

1) Median nerve

Front 15

Flexor Carpi Ulnaris

Back 15

origin (s):

1) Humeral head- Medial epicondyle of humerous
2) Ulnar head- Olecranon

insertion (s):

1) Pisiform bone
2) Flexor retinaculum

action (s):

1) Ulnar deviation (abduction)
2) Flexion of the wrist and hand and forearm

innervation (s):

1)