Thoracic_Limb_Muscle_Attachments_and_Functions Flashcards Preview

Gross Anatomy I > Thoracic_Limb_Muscle_Attachments_and_Functions > Flashcards

Flashcards in Thoracic_Limb_Muscle_Attachments_and_Functions Deck (31)
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1
Q

superficial pectoral

A

Origin:

first three sternebrae

median fibrous raphe at the ventral midline

Insertion:

Humerus - greater tubercle (whole crest)

Action:

not weight bearing- adduct limb

weight bearing - prevent abduction

2
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

3
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-

4
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-

5
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-

6
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-

7
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 (eg digging) flex shoulder-

8
Q

serratus ventralis

A

Origin:

ribs transverse processes of cervical vertebrae

Insertion:

-serrated face of the scapula-

Action:

support trunk depress scapula-

9
Q

deltoideus

A

Origin:

spine and acromial process of the scapula

Insertion:

deltoid tuberosity of the humerus

Action:

flex shoulder-

10
Q

infraspinatus

A

Origin:

infraspinous fossa of the scapula

Insertion:

lateral side of the greater tubercule of the humerus (small circumscribed area)

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-

11
Q

teres minor

A

infraglenoid tubercle of the scapula distal caudal border of the scapula -teres minor tuberosity of the humerus-laterally stabilizes the shoulder (prevents medial rotation while weight-bearing) laterally rotate shoulder flex shoulder (assists other muscles) –

12
Q

supraspinatus

A

supraspinous fossa of the scapula-greater tubercle of the humerus (thick tendon)-laterally stabilizes the shoulder (prevents medial rotation while weight-bearing) extend shoulder-

13
Q

subscapularis

A

subscapular fossa of the scapula-lesser tubercle of the humerus-medially stabilizes the shoulder (prevents lateral rotation while weight-bearing) adduct shoulder extend shoulder-

14
Q

teres major

A

caudal angle and caudal border of the scapula subscapularis muscle-teres major tuberosity of the humerus-flex shoulder rotate arm medially-

15
Q

coracobrachialis

A

coracoid process of the scapula-crest of the lesser tubercle of the humerus near the teres major tuberosity-mainly a shoulder stabilizer but can assist other muscles in adduction and/or extension of the shoulder-

16
Q

tensor fasciae antebrachii

A

fascia covering the lateral surface of the latissimus dorsi muscle-olecranon of the ulna in common with the tendon of insertion of the triceps brachii muscle-extend elbow-

17
Q

triceps brachii

A

caudal border of scapula (long head) tricipital line proximal humerus (neck lesser tubercle and crest of the lesser tubercle)-olecranon of ulna-flex shoulder (long head) extend elbow (all heads)-

18
Q

anconeus

A

lateral supracondylar crest of the humerus lateral and medial epicondyles of the humerus-proximal and lateral aspect of the ulna-extend elbow-

19
Q

biceps brachii

A

supraglenoid tubercle of the scapula-radial and ulnar tuberosities-extend shoulder flex elbow-

20
Q

brachialis

A

proximal and lateral aspect of the humerus-radial and ulnar tuberosities-flex elbow-

21
Q

extensor carpi radialis

A

lateral supracondylar crest of the humerus-metacarpal tuberosities (dorsal aspect) of MC II and III-extend carpus-

22
Q

common digital extensor

A

lateral epicondyle of the humerus-extensor processes of the distal phalanx of digits II III IV and V-extend the joints of the four principal digits-

23
Q

lateral digital extensor

A

lateral epicondyle of the humerus-extensor processes of the distal phalanx of digits III IV and V proximal ends of all phalanges of same digits-extend the joints of digits III IV and V-

24
Q

ulnaris lateralis

A

lateral epicondyle of the humerus-lateral aspect of the proximal end of MC V accessory carpal bone-abduct carpus flex carpus-

25
Q

supinator

A

lateral epicondyle of the humerus-cranial aspect of proximal radius-supination (rotate antebrachium laterally so that the palmar surface of the paw faces medially)-

26
Q

pronator teres

A

medial epicondyle of the humerus-medial border of the radius-pronation (rotate the antebrachium medially so that the palmar surface of the paw faces the ground)-

27
Q

abductor pollicis longus

A

lateral and cranial border of the ulna interosseus membrane between the radius and ulna-proximal end of metacarpal I-abduct digit I-

28
Q

flexor carpi radialis

A

medial epicondyle of the humerus medial border of the radius-palmar surface of proximal MC II and III-flex carpus-

29
Q

superficial digital flexor

A

medial epicondyle of the humerus-palmar surface of the base of the middle phalanges of digits II III IV and V-flex digits II - V –

30
Q

flexor carpi ulnaris

A

medial epicondyle of the humerus caudal and medial aspect of olecranon-accessory carpal bone-flex carpus-

31
Q

deep digital flexor

A

medial epicondyle of humerus ulna radius-flexor tubercle (palmar surface of the base) of the distal phalanx of each digit-flex digits-