Muscle origins, actions and insertions - Thoracic limb Flashcards Preview

Gross Anatomy > Muscle origins, actions and insertions - Thoracic limb > Flashcards

Flashcards in Muscle origins, actions and insertions - Thoracic limb Deck (45):
1

Superficial pectoral muscle

Origin: Sternum

Insertion: Greater tubercle & cranial hmeral border

Action: Adduct thoracic limb

2

Deep pectoral muscle

Origin: Sternum

Insertion: Greater and lesser tubercles

Action: Adduct thoracic limb and flex shoulder joint

3

Brachiocephalicus (Cleidobrachialis, Cleidocephalicus)

Origin: Clavicular Intersection

Insertion: Cleidobrachialis - distal cranial humerus

Cleidocephalicus :
pars mastoidea - mastoid process

pars cervicalis - dorsal mid-line of the neck

Action: Pull thoracic limb cranially, dpress head pull head and neck laterally

4

Sternocephalicus

Origin: Sternum

Insertion: Mastoid part of temporal bone, occipital bone

Action: Depress head, Draw the head and neck to the side

5

Sternohyoideus

Origin: Sternum

Insertion: Basihyoid bone

Action: Pull the tongue and larynx caudally

6

Sternothyroideus

Origin: Cranial aspect of sternum (manubrium)

Insertion: thyroid cartilage

Action: Draw the tongue and larynx caudally

7

Omotransversarius

Origin: wing of the atlas

Insertion: distal spine of scapula

Action: Pull limb cranially or flex the neck laterally

8

What is the supraspinous ligament?

Connects dorsal aspects of vertebral spines

9

What is the nuchal ligament?

Extends from the spine of the first thoracic to the spine of the axis

10

Trapezius

Origin: Dorsal neck (cervical)
Dorsal thoracic (thoracic)

Insertion: Spine of the scapula

Action: Elevate the forelimb

11

Rhomboideus

Origin:
Capitis - Nuchal crest

Cervicis - Dorsal neck

Thoracis - Dorsal thorax

Insertion: Dorsal border of scapula

Action: Elevate the forelimb

12

Latissimus dorsi

Origin: thoracolumbar fascia

Insertion: Teres major tuberosity

Action: Draw the limb caudally, flex or extend the humeral joint

13

Serratus ventralis (cervicis, thoracis)

Origin:
Cervicis - cervical vertebrae

Thoracis - thoracic wall (ribs)

Insertion: Serrated face of scapula

Action: Support/elevate the trunk

14

Deltoideus

Origin: The spine of the scapula and acromion

Insertion: Deltoid tuberosity

Action: Flex the humeral joint

15

Infraspinatus

Origin: Infraspinous fossa

Insertion: greater tubercle

Action: Flex humeral joint, abduct limb at humeral joint, lateral collateral ligament for scapula

16

Teres minor (ID only)

Origin: caudal border of the scapula

Insertion: Teres minor tuberosity

Action: Flex shoulder joint, rotate shoulder laterally, prevent medial rotation when weight bearing

17

Supraspinatus

Origin: Supraspinous fossa

Insertion: Greater tubercle

Action: Extend humeral joint

18

Subscapularis

Origin: Subscapular fossa

Insertion: Lesser tubercle

Action: Adduct limb at humeral joint, medial collateral ligament

19

Teres major

Origin: caudal border of the scapula

Insertion: Teres major tuberosity

Action: Flex humeral joint

20

Coracobrachialis

Origin: Coracoid process of the scapula

Insertion: Crest of the lesser tubercle

Action: Stabilize humeral joint medially

21

Tensor fasciae antebrachii

Origin: Fascia covering the lateral side of the latissimus dorsi

Insertion: Olecranon

Action: Extends the elbow

22

Triceps brachii - long head

Origin: Caudal border of the scapula

Insertion: Olecranon tuber

Action: Extends the cubital joint, flex the humeral joint

23

Triceps brachii - lateral head

Origin: Proximal hmerus

Insertion: Olecranon tuber

Action: Extend the elbow

24

Triceps brachii - accessory head

Origin: Proximal humerus

Insertion: Olecranon tuber

Action: Extends the elbow

25

Triceps brachii - medial head

Origin: Proximal humerus

Insertion: Olecranon

Action: Extend the elbow

26

Aconeous (ID only)

Origin: Lateral suprachondylar crest

Insertion: olecranon tuber

Action: Extend the elbow

27

Biceps brachii

Origin: Supraglenoid tubercle

Insertion: Ulnar and radial tuberosities

Action: Flex the cbital joint, extend the humeral joint

28

Brachialis

Origin: Brachialis groove

Insertion: Proximal radius/ulna

Action: Flex the cubital joint

29

Extensor carpi radialis

Origin: Lateral epicondyle of humerus

Insertion: dorsal base of metacarpals II and III

Action: Extend the carpal joints

30

Common digital extensor

Origin: Lateral epicondyle of the humerus

Insertion: Extensor processes of distal phalanges

Action: Extend carpal and digital joints

31

Lateral digital extensor

Origin: Lateral epicondyle of humerus

Insertion: distal phalanges phalanges III, IV, and V

Action: Extend carpal and digital joints and digits III, IV, V

32

Ulnaris Lateralis

Origin: Lateral epicondyle of humerus

Insertion: accessory carpal bone and base of 5th metacarpal bone

Action: Flex carpal joints, abduct manus

33

Abductor digiti I longus (ID only)

Origin: Body of Ulna

Insertion: Proximal end of metacarpal I

Action: Abduct the first digit, extend carpal joints

34

Pronator teres

Origin: Medial epicondyle of humerus

Insertion: Medial border of radius

Action: Weak pronation of manus, weak flexion of cubital joint

35

Supinator (ID only)

Origin: Lateral epicondyle of humerus

Insertion: Body of radius

Action: Supination of manus

36

Flexor carpi radialis

Origin: Medial epicondyle of humerus

Insertion: Palmar base of metacarpals II and III

Action: Flex the carpal joints

37

Superficial digital flexor

Origin: medial epicondyle of humerus

Insertion: Middle phalanges of the digits

Action: Flex carpal joints, metacarpophalangeal and proximal interphalangeal joints

38

Flexor carpi ulnaris - both heads

Origin: Medial epicondyle and olecranon

Insertion: Accessory carpal bone

Action: Flex carpal joints

39

Deep digital flexor - Humeral head

Origin: Medial epicondyle of humerus

Insertion: Flexor tubercles of distal phalanges

Action: Flex the carpal and digital joints

40

Deep digital flexor - Ulnar head

Origin: caudal border of ulna

Insertion: Flexor tubercles of distal phalanges

Action: Flex the carpal and digital joints

41

Deep digital flexor - radial head

Origin: medial border of the radius

Insertion: Flexor tubercles on distal phalanges

Action: Flex the carpal and digital joints

42

Pronator quadratus

Origin and insertion: Apposed surfaces of the radius and ulna

Action: pronate the manus

43

Interossei

Origin: Palmar base of (respective) metacarpal

Insertion: Palmar base of (respective) proximal phalanx and tendon of common DE

Action: Flex and support metacarpophalangeal joint

44

Tensor fasiae antbrachii

Origin: Lattissimus dorsi and associated fascia

Insertion: Olecranon tuber

Action: Extend cubital joint and tense deep antebrachial fascia

45

Brachioradialis

Origin: Lateral epicondyle of the humerus

Insertion: fascia near the carpus

Action: Flex cubital joint, supinate the manus