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Gross Anatomy I > TL Origins, Insertions and Actions > Flashcards

TL Origins, Insertions and Actions Flashcards

1
Q

Infraspinatus

A

Origin

infraspinous fossa of the scapula

Insertion

lateral side of the greater tubercule of the humerus

Action

laterally stabilizes the shoulder (prevents medial rotation while weight-bearing); abduct and laterally rotate shoulder; assists other muscles in the extension or flexion of shoulder

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2
Q

superficial pectoral

A

Origin

first three sternebrae; median fibrous raphe at the ventral midline

Insertion

whole crest of the greater tubercle of the humerus

Action

adduct limb when not bearing weight; prevention of abduction of limb while bearing weight

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3
Q

deep pectoral

A

Origin

ventral part of sternum; median fibrous raphe at the ventral midline

Insertion

lesser tubercle of the humerus (major portion of insertion); greater tubercle and crest via aponeurosis

Action

pull trunk cranially when limb is advanced and fixed; extend shoulder; draw limb caudally when not supporting weight

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4
Q

brachiocephalicus

A

Origin

clavicular intersection

Insertion

distal end of cranial aspect of the humerus; middorsal fibrous raphe of the neck; mastoid part of the temporal bone

Action

advance the limb; extend shoulder; draw head and neck to the side

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5
Q

omotransversarius

A

Origin

wing, or transverse process, of the atlas (cervical vertebra 1)

Insertion

distal end of the spine of the scapula

Action

advance the limb; flex the neck laterally

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6
Q

trapezius

A

Origin

median fibrous raphe of the neck; supraspinous ligament

Insertion

spine of the scapula

Action

elevate and abduct limb at the shoulder

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7
Q

rhomboideus

A

Origin

base of skull (nuchal crest of occipital bone); median fibrous raphe of neck; spinous process of thoracic vertebrae

Insertion

dorsal border of scapula

Action

elevate limb; draw scapula against trunk

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8
Q

latissimus dorsi

A

Origin

thoracolumbar fascia; last 2 - 3 ribs

Insertion

teres major tuberosity of the humerus via the teres major tendon

Action

draw limb caudally (e.g., digging); flex shoulder

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9
Q

serratus ventralis

A

Origin

ribs; transverse processes of cervical vertebrae

Insertion

serrated face of the scapula

Action

support trunk; depress scapula

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10
Q

deltoideus

A

Origin

spine and acromial process of the scapula

Insertion

deltoid tuberosity of the humerus

Action

flex shoulder

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11
Q

teres minor

A

Origin

infraglenoid tubercle of the scapula; distal caudal border of the scapula

Insertion

teres minor tuberosity of the humerus

Action

laterally stabilizes the shoulder (prevents medial rotation while weight-bearing); laterally rotate shoulder; flex shoulder (assists other muscles)

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12
Q

supraspinatus

A

Origin

supraspinous fossa of the scapula

Insertion

greater tubercle of the humerus (thick tendon)

Action

laterally stabilizes the shoulder (prevents medial rotation while weight-bearing); extend shoulder

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13
Q

subscapularis

A

Origin

subscapular fossa of the scapula

Insertion

lesser tubercle of the humerus

Action

medially stabilizes the shoulder (prevents lateral rotation while weight-bearing); adduct shoulder; extend shoulder

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14
Q

teres major

A

Origin

caudal angle and caudal border of the scapula; subscapularis muscle

Insertion

teres major tuberosity of the humerus

Action

flex shoulder; rotate arm medially

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15
Q

coracobrachialis

A

Origin

coracoid process of the scapula

Insertion

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

Action

mainly a shoulder stabilizer, but can assist other muscles in adduction and/or extension of the shoulder

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16
Q

triceps brachii

A

Origin

caudal border of scapula (long head); tricipital line, proximal humerus

Insertion

olecranon of ulna

Action

flex shoulder (long head); extend elbow (all heads)

17
Q

anconeus

A

Origin

lateral supracondylar crest of the humerus; lateral and medial epicondyles of the humerus

Insertion

proximal and lateral aspect of the ulna

Action

extend elbow

18
Q

biceps brachii

A

Origin

supraglenoid tubercle of the scapula

Insertion

radial and ulnar tuberosities

Action

extend shoulder; flex elbow

19
Q

brachialis

A

Origin

proximal and lateral aspect of the humerus

Insertion

radial and ulnar tuberosities

Action

flex elbow

20
Q

extensor carpi radialis

A

Origin

lateral supracondylar crest of the humerus

Insertion

metacarpal tuberosities (dorsal aspect) of MC II and III

Action

extend carpus

21
Q

common digital extensor

A

Origin

lateral epicondyle of the humerus

Insertion

lateral epicondyle of the humerus extensor processes of the distal phalanx of digits II, III, IV, and V

Action

extend the joints of the four principal digits

22
Q

lateral digital extensor

A

Origin

lateral epicondyle of the humerus

Insertion

extensor processes of the distal phalanx of digits III, IV, and V; proximal ends of all phalanges of same digits

Action

extend the joints of digits III, IV, and V

23
Q

ulnaris lateralis

A

Origin

lateral epicondyle of the humerus

Insertion

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

Action

abduct carpus; flex carpus

24
Q

supinator

A

Origin

lateral epicondyle of the humerus

Insertion

cranial aspect of proximal radius

Action

supination (rotate antebrachium laterally so that the palmar surface of the paw faces medially)

25
Q

pronator teres

A

Origin

medial epicondyle of the humerus

Insertion

medial border of the radius

Action

pronation (rotate the antebrachium medially so that the palmar surface of the paw faces the ground)

26
Q

abductor pollicis longus

A

Origin

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

Insertion

proximal end of metacarpal I

Action

abduct digit I

27
Q

flexor carpi radialis

A

Origin

medial epicondyle of the humerus; medial border of the radius

Insertion

palmar surface of proximal MC II and III

Action

flex carpus

28
Q

superficial digital flexor

A

Origin

medial epicondyle of the humerus

Insertion

palmar surface of the base of the middle phalanges of digits II, III, IV, and V

Action

flex digits II - V

29
Q

flexor carpi ulnaris

A

Origin

medial epicondyle of the humerus; caudal and medial aspect of olecranon

Insertion

accessory carpal bone

Action

flex carpus

30
Q

deep digital flexor

A

Origin

medial epicondyle of humerus; ulna; radius

Insertion

flexor tubercle (palmar surface of the base) of the distal phalanx of each digit

Action

flex digits

31
Q

pronator quadratus

(action only)

A

Action

pronate the antebrachium

Gross Anatomy I (18 decks)

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