Exam 2 Actions, Origins, & Insertions Flashcards
Superficial pectoral m.
Origin: sternum
Insertion: crest of greater tubercle and cranial humeral border
Action: adduct the thoracic limb
Deep pectoral m.
Origin: sternum
Insertion: greater and lesser tubercles of humerus
Action: adduct thoracic limb and pull it caudally
Brachiocephalicus m.
Origin: clavicular intersection
Insertion:
cleidobrachialis: distal cranial humerus
cleidocephalicus:
mastoid part: mastoid process of temporal bone
cervical part: dorsal midline of neck
Action: pull thoracic limb cranially (and/or) depress and pull head and neck laterally
Omotransversariusm.
Cranial-most attachment: wing of atlas
Caudal-most attachment: distal spine of scapula
Action: pull thoracic limb cranially (and/or) depress and pull head and neck laterally
Trapezius m.
Origin:
cervical part: dorsal neck
thoracic part: dorsal thorax
Insertion: spine of the scapula
Action: elevate the thoracic limb
Rhomboideus m.
Origin:
rhomboideus thoracis: dorsal thorax
rhomboideus cervicis: dorsal neck
rhomboideus capitis: nuchal crest of occipital bone
Insertion: dorsal border of scapula and/or scapular cartilage
Action: elevate the thoracic limb
Serratus ventralis m.
Origin:
serratus ventralis cervicis: cervical vertebrae
serratus ventralis thorais: thoracic wall (ribs)
Insertion: serrated face of scapula
Action: support and/or elevate the trunk
Latissimus dorsi m.
Origin: thoracolumbar fascia
Insertion: teres major tuberosity
Action: draw the thoracic limb caudally, flex or extend the humeral joint
Deltoideus m.
Origin: spine of the scapula and acromion
Insertion: deltoid tuberosity
Action: extend the humeral joint
Supraspinatus m.
Origin: supraspinous fossa of the scapula
Insertion: greater tubercle of the humerus
Action: flex humeral joint (varies); abduct limb at humeral joint
Infraspinatus m.
Origin: infraspinous fossa of the scapula
Insertion: greater tubercle of the humerus
Action: flex the humoral joint; abduct the limb at humeral joint
Teres minor m.
ID only
Subscapularis m.
Origin: subscapular fossa of scapula
Insertion: lesser tubercle of humerus
Action: adduct limb at humeral joint
Teres major m.
Origin: caudal border of scapula
Insertion: teres major tuberosity of humerus
Action: flex the humeral joint
Coracobrachialis m.
Origin: coracoid process of scapula
Biceps brachii m.
Origin: supraglenoid tubercle
Insertion: radial and ulnar tuberosities
Action: flex the cubital joint and extend the humeral joint
Brachialis m.
Origin: brachial groove of humerus
Insertion: proximal radius andulna
Action: flex the cubital joint
Triceps brachii m.
long, lateral, medial and accessory heads
Origin: caudal border of scapula (long head); proximal humerus (other heads)
Insertion: tuber olecrani
Action: extend the cubital joint (all heads); flex the humeral joint (long head)
Tensor fasciae antebrachii m.
Origin: latissimus dorsi and associated fascia
Insetion: tuber olecrani
Action: extend the cubital joint
Extensor carpi radialis m.
Origin: lateral epicondyle of the humerus
Insertion: dorsal base of second and third metacarpal bones
Action: extend the carpal joints
Common digital extensor m.
Origin: lateral epicondyle of the humerus
Insertion: extensor processes of the distal phalanges
Action: extend the carpal and digital joints
Lateral digital extensor m.
Origin: lateral epicondyle of the humerus
Insertion: distal phalanges of lateral digit(s)
Action: extend the carpal and digital joints of the lateral-most digits
Ulnaris lateralis m.
Origin: lateral epicondyle of the humerus
Insertion: accessory carpal bone and lateral base of 5th metacarpal bone
Action: flex the carpal joints; abduct the manus
Supinator m.
ID only
Flexor carpi radialis m.
Origin: medical epicondyle of the humerus
Insertion: palmar base of metacarpal bones 2 and 3
Action: flex the carpal joints
Flexor carpi ulnaris m.
Origin: medial epicondyle and olecrenon
Insertion: accessory carpal bone
Action: flex the carpal joint
(humeral and ulnar heads!)
Superficial digital flexor m.
Origin: medial epicondyle of the humerus
Insertion: middle phalanges of the digits (palmar aspects)
Action: flex the carpal joints, metacarpophalangeal, and proximal interphalangeal joints
Deep digital flexor m.
Origin: humerus (medial epicondyle), radius, ulna
Insertion: flexor tubercules of distal phalanges
Action: flex the carpal and distal joints
Pronator teres m.
Origin: medial epicondyle of the humerus
Insertion: medial body of radius
Action: weak elbow flexion and weak pronation of the manus
Pronator quadratus m.
Attachments: apposed surfaces of the radius and the ulna
Action: pronation of the manus
Interossei muscles (assocaited with proximal sesamoid bones)
Origin: palmar base of respective metacarpal bone
Insertion: palmar base of respective proximal phalanx (&tendon of common digital extensor dorsally)
Action: flexes and supports metacarpophalangeal joint
