Anatomy Bootcamp Muscles - Origin, Action, Termination

Superficial pectoral orgin

sternum

Superficial pectoral termination

greater tubercle

Superficial pectoral action

adduct the thoracic limb

What are the muscles of the thoracic limb?

superficial pectoral, deep pectoral, brachiocephalicus, omotransversarius, trapezius, rhomboideus, latissimus dorsi, and serratus ventralis

What is the function of the thoracic limb?

attaches the limb to the axial skeleton

Deep pectoral origin

sternum

Deep pectoral termination

greater and lesser tubercles of humerus

Deep pectoral action

adduct thoracic limb and pull it caudally

Brachiocephalicus origin

clavicular intersection

Brachiocephalicus termination

humerus, skull, neck

Brachiocephalicus action

pull thoracic limb cranially and/ot depress and pull head and neck laterally

Omotransversarius origin

wing of the atlas

Omotransversarius termination

distal spine of the scapula

Omotransversarius action

pull thoracic limb cranially and/or depress and pull head and neck laterally

Trapezius origin in the cervical region

dorsal neck

Trapezius origin in thoracic region

dorsal thorax

Trapezius termination

spine of the scapula

Trapezius action

elevate the thoracic limb

Rhomboideus termination

dorsal border of scapula

Rhomboideus action

elevate the thoracic limb

Serratus ventralis origin

cervical vertebrae and thoracic wall (ribs)

Serratus ventralis termination

serrated face of scapula

Serratus ventralis action

support and/or elevate the trunk

Latissimus dorsi origin

thoracolumbar fascia

Latissimus dorsi action

draw the thoracic limb caudally, flex or extend the humeral joint

Sternocephalicus origin

sternum

Sternocephalicus termination

bones of skull

Sternocephalicus action

depress head and neck; draw head and neck laterally

Sternohyoideus origin

sternum

Sternohyoideus termination

basihyoid bone

Sternohyoideus action

pull tongue and larynx caudally

Sternothyroideus origin

cranial aspect of sternum

Sternothyroideus termination

thyroid cartilage

Sternothyroideus action

pull tongue and larynx caudally

Deltoideus origin

spine of the scapula and acromion

Deltoideus termination

deltoid tuberosity of humerus

Deltoideus action

flex the humeral joint

Supraspinatus origin

supraspinous fossa of the scapula

Supraspinatus termination

greater tubercle of the humerus

Supraspinatus action

extend the humeral joint

Infraspinatus origin

infraspinous fossa of the scapula

Infraspinatus termination

greater tubercle of the humerus

Infraspinatus action

flex the humeral joint; abduct the limb at the humeral joint

Teres minor origin

caudal border of scapula

Teres minor action

flex the humeral joint

Subscapularis origin

subscapular fossa of scapula

Subscapularis termination

lesser tubercle of humerus

Subscapularis action

adduct limb at humeral joint

Teres major origin

caudal border of scapula

Teres major action

flex the humeral joint

Coracobrachialis origin

coracoid process of the scapula

Coracobrachialis termination

lesser tubercle of the humerus

Coracobrachialis action

adduct limb at shoulder

Biceps brachii origin

supraglenoid tubercle

Biceps brachii action

flex the cubital joint and extend the humeral joint

Brachialis origin

brachial groove of humerus

Brachialis action

flex the cubital joint

Triceps brachii long head origin

caudal border of scapula

Triceps  brachii lateral heads

proximal humerus

Triceps  brachii acessory and medial

proximal humerus

Triceps brachii termination

olecranon

Triceps brachii action

extend the cubital joint

Specific Triceps brachii action of longhead

flex the humeral joint

Extensor carpi radialis origin

lateral epicondule of the humerus

Extensor carpi radialis termination

second and third metacarpal bones

Extensor carpi radialis action

extend the carpal joints

Common digital extensor origin

lateral epicondyle of the humerus

Common digital extensor termination

distal phalanges

Common  digital  extensor action

extend the carpal and digital joints

Lateral digital extensor origin

lateral epicondyle of the humerus

Lateral digital extensor termination

distal phalanges of lateral digits

Lateral digital extensor action

extend the carpal joints and the digital joints of the lateral most digits

Extensor carpi ulnaris m. (ulnaris lateralis m.) origin

lateral epicondyle of the humerus

Extensor carpi ulnaris m. (ulnaris lateralis m.) termination

accessory carpal bone and fifth metacarpal bone

Extensor carpi ulnaris m. (ulnaris lateralis m.) action

flex the carpal joints; abduct the manus

Supinator origin

lateral epicondyle of the humerus

Supinator termination

radius

Supinator action

Supination of the manus

Abductor pollicis action

abduct the first digit

Flexor carpi radialis origin

medial epicondyle of the humerus

Flexor carpi radialis termination

metacarpal bones 2 and 3

Flexor carpi radialis action

flex the carpal joints

Flexor carpi ulnaris origin

medial epicondyle

Flexor carpi ulnaris termination

accessory carpal bone

Flexor carpi ulnaris action

flex the carpal joints

Superficial digital flexor origin

medial epicondyle of the humerus

Superficial digital flexor termination

middle phalanges of the digits

Superficial digital flexor action

flex the carpal joints, metacarpophalangeal and proximal interphalangeal joints

Deep digital flexor origin

medial epicondyle of the humerus

Deep digital flexor termination

distal phalanges

Deep digital flexor action

flex the carpal and digital joints

Pronator teres origin

medial epicondyle of the humerus

Pronator teres termination

radius

Pronator teres action

pronation of the manus

Pronator quadratus action

pronation of the manus

What are the muscles of the manus

Interosseous muscles

Superficial gluteal origin

sacrotuberous ligament

Superficial gluteal termination

femur

Middle gluteal origin

gluteal surface of the ilium

Middle gluteal termination

greater trochanter of the femur