Thoracic mm and their OIA Flashcards by Jericho James Regidor

Descending pectoral

O: Manubrium

I: Crest of greater tubercle of humerus

A: ADDUCT limb and prevent abduction of limb

Innervation: Cranial pectoral nerve

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Transverse pectoral

O: 1st, 2nd, 3rd sternebrae

I: Crest of greater tubercle of humerus

A: ADDUCT limb and prevent abduction of limb

Innervation: Cranial pectoral nerve

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Deep pectoral

O: Ventral part of sternum and xiphoid cartilage

I: tendon = lesser tubercle of humerus
aponeurosis = crest of greater tubercle

A: PULL trunk cranially, EXTEND shoulder joint when supporting weight. FLEX shoulder joint when not supporting weight. ADDUCT limb

Innervation: Caudal pectoral nerve

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Brachiocephalicus (Cleidocephalicus pars cervicalis)

O: clavicular intersection/clavicle

I: cranial half of mid-dorsal fibrous raphe, nuchal crest of occipital bone

A: ADVANCE the limb, EXTEND the shoulder joint, DRAW the neck and head to the side

Innervation: Accessory n.
Ventral branches of cervical spinal nerves

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Brachiocephalicus (Cleidocephalicus pars mastoideus)

O: clavicular intersection/clavicle

I: mastoid part of temporal bone

A: ADVANCE the limb, EXTEND the shoulder joint, DRAW the neck and head to the side

N: Accessory n.
Ventral branches of cervical spinal nerves

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Brachiocephalicus (Cleidobrachialis)

O: Clavicular intersection/clavicle

I: distal end of cranial border of humerus

A: ADVANCE the limb, EXTEND the shoulder joint, DRAW the neck and head to the side

N: Accessory n.
Ventral branches of cervical spinal nerves

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Sternocephalicus pars mastoideus

O: manubrium

I: mastoid part of temporal bone

A: DRAW head and neck to side

N: Accessory n.

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Sternocephalicus pars occipitalis

O: manubrium

I: nuchal crest of occipital bone

A: DRAW head and neck to side

N: Accessory n.

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Sternohyoideus

O: Manubrium and 1st costal cartilage

I: basihyoid bone

A: PULL tongue and larynx caudally

N: Ventral branch of cervical spinal n.

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Sternothyroideus

O: 1st costal cartilage

I: Caudolateral surface of thyroid cartilage

A: DRAW tongue and larynx caudally

N: Ventral branch of cervical spinal n.

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Omotransversarius (has the Superficial cervical lymph node)

O: distal end of scapular spine

I: Transverse wing of C1 (atlas)

A: ADVANCE or FLEX neck laterally

N: Accessory n.

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Trapezius cervicis and thoracis

O: median raphe of neck and supraspinous lig. from C3 to T9

I: spine of scapula

A: ABDUCT forelimb

N: Accessory n.

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Rhomboideus capitis

O: nuchal crest of occipital bone

I: dorsal border and adjacent surfaces of scapula

A: ELEVATE forelimb DRAW scapula to trunk

N: Ventral branch of cervical and thoracic spinal n

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Rhomboideus cervicis

O: median fibrous raphe of neck

I: dorsal border and adjacent surfaces of scapula

A: ELEVATE forelimb DRAW scapula to trunk

N: Ventral branch of cervical and thoracic spinal n.

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Rhomboideus thoracis

O: spinous process of T1-T7

I: dorsal border and adjacent surfaces of scapula

A: ELEVATE forelimb DRAW scapula to trunk

N: Ventral branch of cervical and thoracic spinal n.

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Latissimus dorsi

O: Thoracolumbar fascia from spinous process of lumbar and last 7 or 8 thoracic vertebrae
Attachment to last 2 or 3 ribs

I: Teres major tuberosity of humerus and teres major tendon

A: DRAW free limb caudally, FLEX shoulder joint

N: thoracodorsal n.

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Serratus ventralis cervicis and thoracis

O: transverse process of last 5 cervical vertebrae and 1st 7 or 8 ribs ventral to their middle

I: dorsomedial third of scapula or Serrated face

A: SUPPORT trunk and DEPRESS scapula

N: Ventral branch of cervical spinal n. and long thoracic n.

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Deltoideus (scapular and acromial divisions)

O: Spine and acromial process of scapula

I: Deltoid tuberosity

A: FLEX shoulder

N: Axillary n.

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Infraspinatus

O: Infraspinous fossa

I: Greater tubercle of humerus

A: ABDUCT shoulder, ROTATE shoulder laterally; medially if wt bearing, LATERAL STABILITY

N: Suprascapular n.

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Supraspinatus

O: Supraspinous fossa

I: Greater tubercle of humerus

A: EXTEND and STABILIZE shoulder jt

N: Suprascapular n.

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Teres minor

O: Infraglenoid tubercle

I: Teres minor tuberosity

A: FLEX shoulder, ROTATE shoulder laterally; medially when wt. bearing

N: Axillary n.

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Subscapularis

O: Subscapular fossa

I: Lesser tubercle of humerus

A: ADDUCT, EXTEND and medially STABILIZE shoulder jt, ROTATE shoulder medially; laterally when wt. bearing

N: Subscapular n.

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Teres major

O: Caudal border of scapula

I: Teres major tuberosity

A: FLEX shoulder jt., ROTATE shoulder medially; laterally when wt. bearing

N: Axillary n.

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Coracobrachialis

O: Coracoid process of scapula

I: Cress of lesser tubercle proximal to teres major tuberosity

A: ADDUCT, EXTEND, STABILIZ shoulder jt.

N: Musculocutaneous n.

Tensor fasciae antebrachii

O: Fascia from lat. dorsi I: olecranon A: EXTEND elbow N: Radial n.

Triceps brachii long head

O: Cd. border of scapula I: olecranon tuber A: EXTEND elbow, FLEX shoulder N: Radial n.

Triceps brachii lateral head

O: tricipital line of humerus I: Olecranon tuber A: EXTEND elbow N: Radial n.

Triceps brachii accessory head

O: neck of humerus I: Olecranon tuber A: EXTEND elbow N: Radial n.

Triceps brachii medial head

O: Crest of lesser tubercle of humerus I: Olecranon A: Extend elbow N: Radial n.

Anconeus

O: Lateral supracondylar crest and lateral and medial epicondyles of humerus I: Olecranon A: EXTEND elbow N: Radial n.

Biceps brachii

O: Supraglenoid tubercle I: Radial and ulnar tuberosities A: FLEX elbow, EXTEND shoulder N: Musculocutaneous n.

Brachialis

O: Prox 3rd lateral surface of humerus I: Radial and ulnar tuberosities A: FLEX elbow N: Musculocutaneous n.

Brachioradialis

O: lateral supracondylar crest I: distal 4th or radius A: assist in FLEXING the elbow N: Radial n.

Extensor carpi radialis

O: lateral supracondylar crest I: dorsal base of metacarpal II and III A: EXTEND carpus N: Radial n.

Common digital extensor

O: lateral epicondyle of humerus I: extensor process of distal phalanges on digits 2, 3, 4, 5 A: EXTEND joints of the 4 principal digits and carpus N: Radial n.

Lateral digital extensor

O: Lateral epicondyle of humerus I: Proximal end of all phalanges of digits 3, 4, 5 Main insertion: extensor process of distal phalanges of digits 3, 4, 5 A: EXTEND joints of digits 3, 4, 5, and carpus N: Radial n.

Ulnaris lateralis

O: lateral epicondyle of humerus I: Lateral aspect of proximal end of 5th metacarpal and accessory carpal bone A: ABDUCT carpal jt. and support carpus N: Radial n.

Supinator

O: lateral epicondyle of humerus I: cranial surface of the proximal 4th of radius A: ROTATE forearm laterally or SUPINE the forearm N: Radial n.

Abductor digiti I longus

O: lateral border and cranial surface of ulna, interosseus membrane I: Proximal end of 1st metacarpal (digiti I) A: ABDUCT 1st digit or extend carpal jt. N: Radial n.

Pronator teres

O: Medial epicondyle of humerus I: Medial border of radius between proximal and middle thirds A: ROTATE forearm medially (pronate), FLEX elbow N: Median n.

Flexor carpi radialis

O: medial epicondyle of humerus I: palmar side of base of 2nd and 3rd metacarpal, the tendon will pass through the carpal canal covered the flexor retinaculum A: FLEX carpus N: Median n.

Flexor carpi ulnaris humeral and ulnar head

O: Humeral = medial epicondyle of humerus Ulnar = olecranon I: Accessory carpal bone A: FLEX carpus N: Ulnar n.

Superficial digital flexor

O: Medial epicondyle of humerus I: Palmar surface of base of middle phalanges digits 2, 3, 4, 5 (covered by flexor retinaculum as it pass through the carpal tunnel) A: FLEX carpus, MC joint, proximal interphalangeal joints of digits 2, 3, 4, 5 N: Median n.

Deep digital flexor

O: humeral head = medial epicondyle of humerus ulnar head = olecranon radial head = mid 3rd of the medial border of radius I: Flexor tubercle on palmar surface of distal phalanges of all digits A: FLEX all jts of all digits N: Median n. and Ulnar n.

Pronator quadratus

O: apposed surfaces of radius and ulna I: apposed surface of radius and ulna A: Pronate the paw N: Median n.

Axillary n. innervations

Deltoideus Teres minor Teres major

Subscapular n. innervation

Subscapularis

Suprascapular n. innervation

Infraspinatus Supraspinatus

Musculocutaneous n. innervations

Coracobrachialis Biceps brachii Brachialis

Median n. innervations

FCR Pronator teres Pronator quadratus SDF DDF

Ulnar n. innervations

DDF FCU

Radial n. innervations

Tensor fasciae antebrachii Triceps brachii Anconeus ECR CDE LDE Ulnaris lateralis Abductor digiti 1 longus Supinator

Accessory n. innervations

Brachiocephalics Omotransversarius Trapezius

Cranial pectoral n. innervation

Superficial pectoral

Caudal pectoral n. innervation

Deep pectoral

Ventral branch of cervical spinal n. innervations

Brachiocephalicus and Rhomboideus

Ventral branch of thoracic spinal n. innervations

Rhomboideus

Thoracodorsal n. innervations

Latissimus dorsi