Origin and Insertion of muscles Flashcards
superficial pectoral (descending and transverse)
O: 1st 3 sternebrae
I: crest of the greater tubercle of the humerus
action when not bearing weight: adduct limb
action when bearing weight: prevent limb abduction
deep pectoral
O: ventral part of the sternum
I: lesser tubercle of the humerus
action when not bearing weight: draw the limb caudally and flex shoulder joint
action when bearing weight: pull trunk cranially and extend shoulder joint
cleidobrachialis
O: clavicle
I: distal end of the humerus
action: advance the limb and extend the shoulder joint
cleidocervicalis
O: clavicle
I: mid-dorsal fibrous raphe or nuchal crest of occipital
action: advance the limb and extend the shoulder joint
cleidomastoideus
O: clavicle
I: mastoid process
action: advance the imb and extend the shoulder joint
omotransversarius
O: wing of the atlas
I: scapular spine
action: advance the limb or flex the neck laterally
trapezius
O: median raphe from C3-T9
I: scapular spine
action: elevate and abduct the forelimb
rhomboideus capitis
O: nuchal crest of the occipital
I: dorsal border of the scapula
action: elevate the forelimb and draw the scapula in
rhomboideus cervicus
O: median raphe
I: dorsal border of the scapula
action: elevate the forelimb and draw the scapula in
rhomboideus thoracis
O: T1-7
I: dorsal border of the scapula
action: elevate the forelimb and draw the scapula in
latissimus dorsi
O: T6-L7
I: teres major tuberosity of the humerus
action: draw the limb caudally and flex the shoulder joint
serratus ventralis cervicus
O: transverse processes of C2-7
I: serrated face of scapula
serratus ventralis thoracis
O: transverse processes of T1-8
I: serrated face of scapula
sternomastoideus
O: manubrium
I: mastoid process
sternooccipitalis
O: manubrium
I: nuchal crest of the occipital
sternohyoideus
O: manubrium and 1st costal cartilage
I: basihyoid
sternothyroideus
O: 1st costal cartilage
I: thyroid cartilage
Name at least 4 of the extrinsic muscles of the limb. There are 8 total.
- Superficial pectoral
- Deep pectoral
- Brachiocephalicus
- Omotransversarius
- Trapezius
- Rhomboideus
- Latissimus dorsi
- Serratus ventralis cervicis/thoracis
deltoideus
O: scapular spine/acromion
I: deltoid tuberosity of the humerus
*supraspinatus
O: supraspinous fossa
I: greater tubercle of the humerus
actions: adduct, extend, medially rotate shoulder and stabilize shoulder joint
action when bearing weight: prevent lateral rotation
infraspinatus
O: infraspinous fossa
I: greater tubercle of the humerus
teres minor
O: infraglenoid tubercle/caudal border of scapula
I: teres minor tuberosity of the humerus
subscapularis
O: subscapular fossa
I: greater tubercle of the humerus
*teres major
O: caudal border of the scapula/caudal surface of the subscapularis
I: teres major tuberosity of the humerus
actions: flex and medially rotate the shoulder
action when weight bearing: prevent lateral rotation
coracobrachialis
O: coracoid process of the scapula
I: crest of the lesser tubercle of the humerus
*long head of the triceps
O: caudal border of the scapula
I: olecranon tuber
action: extend elbow, flex shoulder
*lateral head of the triceps
O: tricipital line of the humerus
I: olecranon tuber
action: extend elbow
*accesory head of the triceps
O: neck of the humerus
I: olecranon tuber
action: extend the elbow
*medial head of the triceps
O: crest of the lesser tubercle
I: olecranon
action: extend the elbow
*biceps brachii
O: supraglenoid tubercle of the scapula
I: ulnar and radial tuberosities
action: flex the elbow and extend the shoulder
*extensor carpi radialis
O: lateral supracondylar crest
I: dorsal surface of metacarpals II and III
action: extend the carpus
*common and lateral digital extensor
O: lateral epicondyle of the humerus
I: extensor processes of distal phalanges
action: extend the joints of the carpus and digits
*superficial digital flexor
O: medial epicondyle of the humerus
I: the palmar surface of the base (proximal end) of the middle phalanges of digits 2,3,4, and 5
Innervation: medial nerve
action: to flex carpal, metocarpophalangeal and proximal interphalangeal joints
*flexor carpi ulnaris
composed of ulnar head and humeral head
O of ulnar head: the caudal border and medial surface of the olecranon
O of humeral head: the medial epicondyle of the humerus
I: the accessory carpal bone
action: flex the carpal
*deep digital flexor
O: medial epicondyle of the humerus, ulna and radius
I: flexor tubercle of the distal phalanx
action: to flex the carpal, metocarpalphalangeal and proximal and distal phalangeal joints
ulnaris lateralis
O: lateral epicondyle of the humerus
I: metacarpal 5 and accessory carpal
A: abduct the manus, flex the carpal joint
flexor carpi radialis
O: medial epicondyle of the humerus
I: palmar surface of base of metacarpals II and III
A: flex the carpus
