Week 2: Muscles of the Thoracic Limb Cont. (Origins, Insertions, and Actions) Flashcards by Allison Brown

Teres minor origin (2)

Infraglenoid tubercle of the scapula

distal caudal border of the scapula

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Teres minor insertion

Teres minor tuberosity of the humerus

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Teres minor action (3)

Laterally stabilizes shoulder
Laterally rotates shoulder
Assists other muscles to flex shoulder

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Supraspinatus origin

supraspinatus fossa of the scapula

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Supraspinatus insertion

greater tubercle of the humerus (thick tendon)

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Supraspinatus action (2)

Laterally stabilizes shoulder

Extends shoulder

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Subscapularis origin

Subscapular fossa of the scapula

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Subscapularis insertion

Lesser tubercle of the humerus

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Subscapularis action (3)

Medially stabilizes shoulder
Adduct shoulder
Extend shoulder

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Teres major origin (2)

Caudal angle and caudal border of the scapula

Subscapularis muscle

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Teres major insertion

Teres major tuberosity of the humerus

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Teres major action (2)

Flex shoulder

Rotate limb medially

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Coracobrachialis origin

Coracoid process of the scapula

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What’s special about the coracobrachialis origin tendon

Its long and surrounded by a synovial sheath

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Coracobrachialis insertion

crest of the greater tubercle of the humerus, near the teres major tuberosity

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Coracobrachilias action (2)

Mainly a shoulder stabilizer

Can assist other muscles in adduction and/or extension of the shoulder

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Tensor fasciae antebrachii origin

fascia covering the lateral surface of the latissimus dorsi

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Tensor fasciae antebrachii insertion

Olecranon of the ulna, in common with the tendon of insertion of the triceps brachii muscle

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Tensor fasciae antebrachii action

extend the elbow

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Four heads of the triceps brachii

Long head
Lateral head
Medial head
Accessory head

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Triceps brachii origin (3)

Long head - caudal border of the scapula

Other heads - tricipital line, proximal humerus

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Triceps brachii insertion

Olecranon of the ulna

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Triceps brachii action (2)

Long - flex shoulder

All - extend elbow

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Anconeus origin (3)

Lateral supracondylar crest of the humerus
Crest of the humerus
Lateral and medial epicondyles of the humerus

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Anconeus insertion

lateral and proximal aspect of the ulna

Anconeus action

extend elbow

Biceps brachii origin

Supraglenoid tubercle of the scapula

Biceps brachii insertion

radial and ulnar tuberosities

Biceps brachii action (2)

Extend shoulder | Flex elbow

Brachialis origin

Brachialis groove (proximal and lateral aspect of the humerus)

Brachialis insertion

Radial and ulnar tuberosities

Brachialis action

flew elbow

Extensor carpi radialis origin

Lateral supracondylar crest of the humerus

Extensor carpi radialis insertion

metacarpal tuberosities of MC II and III

Extensor carpi radialis action

extend carpus

Common digital extensor origin

Lateral epicondyle of the humerus

Common digital extensor insertion

Extensor processes of the distal phalanx of digits II-V

Common digital extensor action

Extend the joints of the four principle digits

Lateral digital extensor origin

Lateral epicondyle of the humerus

Lateral digital extensor insertion

extensor processes of the distal phalanx of digits 3-5

Lateral digital extensor action

extend the joints of digits 3-5

Ulnaris lateralis origin

Lateral epicondyle of the humerus

Ulnaris lateralis insertion

lateral aspect of the proximal end of MC V, accessory carpal bone

Ulnaris lateralis action (2)

abduct the carpus | flex the carpus

Supinator origin

lateral epicondyle of the humerus

Supinator insertion

cranial aspect of the proximal radius

Supinator action

supination

Pronator teres origin

medial epicondyle of the humerus

Pronator teres insertion

Medial border of the radius

Pronator teres action

pronation

Abductor pollicis longus origin

lateral and cranial border of the ulna; interosseus membrane between the radius and ulna

Abductor pollicis longus insertion

proximal end of metacarpal I

Abductor pollicis longus action

abduct digit I

Flexor carpi radialis origin

medial epicondyle of the humerus

Flexor carpi radialis insertion

palmar surface of the proximal aspect of MC II and III

Flexor carpi radialis action

flex carpus

Superficial digital flexor origin

medial epicondyle of the humerus

Superficial digital flexor insertion

Palmar surface of the base of the middle phalanges of digits 2-5

Superficial digital flexor action

flex carpus, flex digits 2-5

Flexor carpi ulnaris origin (2)

medial epicondyle of the humerus | olecranon

Flexor carpi ulnaris insertion

accessory carpal bone

Flexor carpi ulnaris action

flex carpus

Deep digital flexor origin (3)

Medial epicondyle of the humerus Ulna Radius

Deep digital flexor insertion

Flexor tubercle of the distal phalanx of each digit

Deep digital flexor action

Flex carpus | Flex digits

Pronator quadratus action

pronate the antebrachium