Anatomy Quiz 1 - Origin, Insertion, Action, Innervation, Arterial Supply

Origin - Cutaneous Trunci

Superficial fascia of thorax and abdomen

Insertion - Cutaneous Trunci

Attaches in superficial fascia of trunk and skin

Innervation - Cutaneous Trunci

Lateral thoracic nerve

Action - Cutaneous Trunci

Twitch skin

Insertion - Descending pectoral

Crest of the greater tubercle of the humerus

Origin - Descending pectoral

First sternebrae

Innervation - Descending pectoral

Cranial pectoral nerve

Action - Descending pectoral

Adduct thoracic limb

Arterial supply - Descending pectoral

External thoracic

Origin - Transverse pectoral

First 2 or 3 sternebrae

Insertion - Transverse Pectoral

Crest of the greater tubercle of the humerus

Innervation - Transverse pectoral

Cranial pectoral

Action - Transverse pectoral

Adduct thoracic limb

Arterial supply - Transverse pectoral

External thoracic

Origin - Deep pectoral

Ventral part of the sternum and fibrous raphe between the pectoral muscles, and deep abdominal fascia in the xiphoid cartilage

Insertion - Deep pectoral

Major portion is attached to the lesser tubercle of the humerus, caudal portion is attached to medial brachial fascia

Innervation - Deep pectoral

Caudal pectoral nerve

Action - Deep pectoral

Adduct thoracic limb and pull it caudally

Arterial supply - Deep pectoral

Lateral thoracic

Origin - Cleidocephalicus

Clavicular intersection

Insertion - Cleidocephalicus (pars cervicalis)

Cranial haf of the mid-dorsal fibrous raphe and the nuchal crest of the occipital bone

Insertion - Cleidocephalicus (pars mastoideus)

Mastoid part of the temporal bone to the sternomastoideus muscle

Innervation - Cleidocephalicus

Accessory nerve

Arterial supply - Cleidocephalicus

Superficial cervical artery

Origin - Cleidobrachialis

Clavicular intersection

Insertion - Cleidobrachialis

Attaches to the distal end of the cranial border of the humerus with a fascial tie into the axilla

Innervation - Cleidobrachialis

Accessory nerve

Arterial supply - Cleidobrachialis

Superficial cervical artery

Origin - Sternocephalicus

First sternebra

Insertion - Sternocephalicus (pars mastoidea)

Mastoid part of temporal bone

Insertion - Sternocephalicus (pars occipitalis)

Nuchal crest of occipital bone

Innervation - Sternocephalicus

Accessory nerve

Action - Sternocephalicus

Draw head and neck to the side

Action - Cleidocephalicus

Advance limb, extend shoulder, pull head and neck to the side

Action - Cleidobrachialis

Advance limb, extend shoulder, pull head and neck to the side

Origin - Sternothyroideus

First costal cartilage

Insertion - Sternothyroideus

Basihyoid bone

Innervation - Sternothyroideus

Ventral branches of cervical spinal nerves and hypoglossal nerve

Action - Sternothyroideus

Pull tongue and larynx caudally

Origin - Sternohyoideus

First sternebra and first costal cartilage

Insertion - Sternohyoideus

Basihyoid bone

Innervation - Sternohyoideus

Ventral branches of cervical spinal nerves

Action - Sternohyoideus

Pull tongue and larynx caudally

Origin - Omotransversarius

Transverse process (wing) of atlas

Insertion - Omotransversarius

Acromion (distal end of the spine of the scapula)

Innervation - Omotransversarius

Accessory nerve

Action - Omotransversarius

Advance limb and flex neck laterally

Origin - Trapezius

Median raphe of neck and supraspinous ligament

Insertion - Trapezius

Spine of scapula

Innervation - Trapezius

Accessory nerve

Action - Trapezius

Elevate and abduct forelimb

Origin - Rhomboideus capitis

Nuchal crest of occipital bone

Insertion - Rhomboideus capitis

Dorsal border and adjacent surfaces of the scapula

Innervation - Rhomboideus capitis

Ventral branches of cervical and spinal thoracic nerves

Action - Rhomboideus capitis

Elevate forelimb, draws scapula against trunk

Origin - Rhomboideus cervicis

Median raphe of neck

Insertion - Rhomboideus cervicis

Dorsal border and adjacent surfaces of the scapula

Insertion - Rhomboideus thoracis

Dorsal border and adjacent surfaces of the scapula

Innervation - Rhomboideus cervicis

Ventral branches of cervical and spinal thoracic nerves

Innervation - Rhomboideus thoracis

Ventral branches of cervical and spinal thoracic nerves

Action - Rhomboideus cervicis

Elevate forelimb, draws scapula against trunk

Action - Rhomboideus thoracis

Elevate forelimb, draws scapula against trunk

Origin - Rhonboideus thoracis

Spinous process of first seven thoracic vertebrae

Origin - Latissumus dorsi

Thoracocolumbar fascia of spinous processes of the lumbar and last seven or eight thoracic vertebrae, and muscular attachment to last 2 or 3 ribs

Insertion - Latissimus dorsi

Teres major tuberosity of humerus and teres major tendon

Innervation - Latissimus dorsi

Thoracodorsal nerve

Action - Latissimus dorsi

Draws the free limb caudally, flexes the shoulder joint

Arterial supply - Latissimus dorsi

Lateral thoracic and thoracodorsal arteries

Origin - Serratus ventralis

Transverse process of the last five cervical vertebrae and the first seven or eight ribs ventral to their middle

Insertion - Serratus ventralis

Serrated face of the scapula

Innervation - Serratus ventralis

Long thoracic nerve

Action - Serratus ventralis

Support trunk, depress scapula

Origin - Deltoideus (scapular head)

Spine of the scapula

Origin - Deltoideus (acromial head)

Acromion process

Insertion - Deltoideus

Deltoid tuberosity

Innervation - Deltoideus

Axillary

Action - Deltoideus

Flex the shoulder

Arterial supply - Deltoideus

Caudal circumflex humoral

Origin - Infraspinatous

Infraspinous fossa

Insertion - Infraspinatous

Greater tubercle of the humerus

Innervation - Infraspinatous

Suprascapular nerve

Action - Infraspinatous

Extend and flex the shoulder, abduct and rotate the humerus laterally and prevent medial rotation when weight bearing

Origin - Teres minor

Infragelenoid tubercle and distal third of the caudal border of the scapula

Insertion - Teres minor

Teres minor tuberosity of humerus

Innervation - Teres minor

Axillary muscle

Action - Teres minor

Flex the shoulder, rotate the shoulder laterally, and prevent medial rotation when bearing weight

Arterial supply - Teres minor

Subscapular artery and caudal circumflex humeral artery

Origin - Subscapularis

Subscapular fossa

Insertion - Subscapularis

Lesser tubercle of the humerus

Innervation - Subscapularis

Subscapular nerve

Action - Subscapularis

Adduct, extend, and medially stabilize the shoulder. Rotate the shoulder medially and prevent lateral rotation when bearing weight

Origin - Teres major

Caudal angle and adjacent caudal border of the scapula, caudal surface of the subscapularis

Insertion - Teres major

Teres major tuberosity of the humerus

Innervation - Teres major

Axillary nerve

Action - Teres major

Flex the shoulder joint, rotate the shoulder medially and prevent lateral rotaton when bearing weight

Arterial supply - Teres major

Subscapular and caudal circumflex humoral

Origin - Coracobrachialis

Coracoid process of scapula

Insertion - Coracobrachialis

Lesser tubercle of humerus

Innervation - Coracobrachialis

Musculocutaneous nerve

Action - Coracobrachialis

Adduct, extend, and stabilize shoulder joint