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Anatomy I > Muscles of Thoracic Limb > Flashcards

Muscles of Thoracic Limb Flashcards

1
Q

Superficial pectoral

A

Origin-first 3 sternebrae; median fibrous raphae at the ventral midline

Insertion-crest of the greater tubercle of the humerus

Action-adduct limb (non-weight bearing); prevent abduction of the limb (weight-bearing)
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2
Q

Deep pectoral

A

Origin-ventral part of the sternum; median fibrous raphae at the ventral midline

Insertion-lesser tubercle of humerus (major point of insertion); also greater tubercle and crest of the humerus 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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3
Q

Braciocephalicus

A

Origin-clavicular intersection

Insertion-distal end of cranial humerus (cleidobrachialis); middorsal fibrous raphae of neck (cleidocervicalis); mastoid part of temporal bone (cleidomastoideus)

Action-advance the limb; extend shoulder; draw head and neck to the side
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4
Q

Omotransversarius

A

Origin-wing (transverse process) of the atlas (cervical vertebrae 1)

Insertion-distal end of the spine of the scapula

Action-advance the limb; flex the neck laterally
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5
Q

Trapezius

A

Origin-median fibrous raphae of the neck; supraspinous ligament

Insertion-spine of the scapula

Action-elevate and abduct limb
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6
Q

Rhomboideus

A

Origin-base of skull; median fibrous raphae of neck; spinous processes of thoracic vertebrae

Insertion-dorsal border of scapula

Action-elevate limb; draw scapula against trunk
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7
Q

Latissimus dorsi

A

Origin-thoracolumbar fascia; last few ribs

Insertion-teres major tuberosity of the humerus via the teres major tendon

Action-draw limb caudally (digging); flex shoulder
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8
Q

Serratus ventralis

A

Origin-ribs; transverse processes of cervical vertebrae

Insertion-serrated face of scapula

Action-support trunk; depress scapula

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9
Q

Deltoideus

A

Origin-spine and acromion of the scapula

Insertion-deltoid tuberosity of humerus

Action-flex shoulder
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10
Q

Infraspinatus

A

Origin-infraspinous fossa of scapula

Insertion-lateral side of the greater tubercle of humerus

Action-laterally stabilizes the shoulder (prevents medial rotation while weight bearing); abduct and laterally rotate the shoulder
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11
Q

Teres minor

A

Origin-infraspinous fossa of scapula

Insertion-teres minor tuberosity of humerus

Action-laterally stabilizes shoulder (prevents medial rotation while weight-bearing); laterally rotate shoulder; flex shoulder

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12
Q

Supraspinatous

A

Origin-supraspinous fossa of scapula

Insertion-greater tubercle of humerus

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 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 scapula; subscapularis muscle

Insertion-teres major tuberosity of the humerus

Action-flex shoulder
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15
Q

Coracobrachialis

A

Origin-coracoid process of scapula

Insertion-crest of the lesser tubercle of the humerus (near the teres major tuberosity)

Action-mainly a shoulder stabilizer
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16
Q

Tensor fascia antebrachii

A

Origin-fascia covering the lateral surface of the latissimus dorsi muscle

Insertion-olecranon of the ulna, in common with the tendon of insertion of the triceps brachii muscle

Action-extend shoulder; flex elbow
17
Q

Brachialis

A

Origin-brachialis groove (proximal and lateral aspect of humerus)

Insertion-radial and ulnar tuberosities

Action-flex elbow
18
Q

Extensor carpi radialis

A

Origin-lateral supracondylar crest of humerus

Insertion-metacarpal tuberosities (dorsal aspect) of MC II and III

Action-extend carpus
19
Q

Common digital extensor

A

Origin-lateral epicondyle of the humerus

Insertion-extensor processes of the distal phalanx of digits 2, 3, 4, and 5

Action-extend the joints of the four principal digits (2, 3, 4, 5)

20
Q

Lateral digital extensor

A

Origin-lateral epicondyle of humerus

Insertion-extensor processes of the distal phalanx of digits 3, 4, and 5

Action-extend the joints of digits 3, 4, and 5
21
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

22
Q

Supinator

A

Origin-lateral epicondyle of humerus

Insertion-cranial aspect of proximal radius

Action-supination (rotate antebrachium laterally so that the palmar surface of paw faces medially)
23
Q

Pronator teres

A

Origin-medial epicondyle of humerus

Insertion-medial border of radius

Action pronation (rotate the antebrachium medially so that the palmar surface of paw faces the ground)
24
Q

Abductor pollicis longus

A

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

Insertion-proximal end of metacarpal I

Action-abduct digit I

25
Q

Flexor carpi radialis

A

Origin-medial epicondyle of the humerus

Insertion-palmar surface of proximal aspect (base) of MC II and III

Action-flex carpus
26
Q

Superficial digital flexor

A

Origin-medial epicondyle of the humerus

Insertion-palmar surface of the proximal aspect (base) of the middle phalanges of digits 2, 3, 4, and 5

Action-flex carpus; flex digits 2-5
27
Q

Flexor carpi ulnaris

A

Origin-medial epicondyle of humerus; olecranon

Insertion-accessory carpal bone

Action-flex carpus
28
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 carpus; flex digits

29
Q

Pronator quadratus

A

Action-pronate the antebrachium

30
Q

Triceps brachii

A

Origin: long head: caudal border
of scapula. Other heads:
tricipital line, proximal
humerus

Insertion: olecranon of ulna (in common with tensor fascia antebrachii)

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

31
Q

anconeus

A 
Origin: lateral supracondylar
crest of the humerus;
lateral and medial
epicondyles of the
humerus

Insertion: proximal and lateral aspects of ulna

Action: extend elbow

32
Q

Biceps brachii

A

Origin: supraglenoid tubercle of scapula

Insertion: radial and ulnar tuberosities

Action: extend shoulder, flex elbow

Anatomy I (3 decks)

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