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Flashcards in ANAT: Pectoral and Shoulder Deck (53):
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Pectoral girdle

Bony ring formed by the scapula and the clavicle

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Bones of pectoral girdle

Clavicle, Scapula, Humerus
*Accessory include: Sternum, ribs, glenohumeral joint

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Teres major m. ORIGIN

Posterior side of scapula, near inferior angle

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Teres major m. INSERTION

medial lip of the intertubercular groove, near the insertion of the latissimus dorsi (anterior, superior part of the humeral shaft)

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Teres major m. INNERVATION

lower subscapular n.

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Teres major m. BLOOD

subscapular a.

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Teres major m. ACTION

extension, aDduction, and medial rotation of the humerus (same actions on the humerus/glenohumeral joint as latissimus dorsi)

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Deltoid m. ORIGIN

Lateral 1/3 of clavicle, acromion, and spine of scapula; similar to insertion of trapezius

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Deltoid m. INSERTION

deltoid tuberosity of humerus

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Deltoid m. INNERVATION

Axillary n. (also supplies skin over deltoid)

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Deltoid m. BLOOD

Posterior circumflex humeral a.
- courses with the axillary n. in the quadrangular space

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Deltoid m. ACTIONS

Anterior: flexes and medially rotates
Lateral: aBducts
Posterior: extends and laterally rotates

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Synovial Bursa

between the greater tubercle of the humerus, the deltoid m. and the acromion
*Flat sac of synovial membrane, lubricates motion

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Rotator cuff muscles

Subscapularis m.
Supraspinatus m.
Infraspinatus m.
Teres minor m.

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Subscapularis m. ORIGIN

Subscapular fossa

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Subscapularis m. INSERTION

lesser tubercular of the humerus

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Subscapularis m. INNERVATION

upper and lower subscapular nn.

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Subscapularis m. BLOOD

Subscapular a.

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Subscapularis m. ACTION

medially rotates the humerus (only one!)

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Supraspinatus m. ORIGIN

supraspinous fossa

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Supraspinatus m. INSERTION

superior part of the greater tubercle of the humerus

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Supraspinatus m. INNERVATION

suprascapular n.
-courses through the suprascapular notch and under the transverse scapular ligament

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Supraspinatus m. BLOOD

suprascapular a.
-courses OVER the transverse scapular ligament

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Supraspinatus m. ACTION

Abducts the humerus

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Infraspinatus m. ORIGIN

Infraspinous fossa

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Infraspinatus m. INSERTION

Posterior side of the greater tubercle of the humerus

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Infraspinatus m. INNERVATION

suprascapular n.
passes between the acromion and neck of scapula

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Infraspinatus m. BLOOD

circumflex scapular a.

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Infraspinatus m. ACTION

laterally rotates the humerus

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Teres minor m. ORIGIN

posterior side of the scapula, near its lateral border, lateral to the origin of teres major m.

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Teres minor m. INSERTION

Posterior side of the greater tubercle of the humerus, inferior to the insertion of infraspinatus m.

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Teres minor m. INNERVATION

axillary n.

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Teres minor m. BLOOD

circumflex scapular a.

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Teres minor m. ACTION

laterally rotates humerus

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Pectoralis major m. ORIGIN

medial 1/3 of clavicle
sternum and costal cartilage

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Pectoralis major m. INSERTION

Lateral lip of intertubercular groove (sulcus)

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Pectoralis major m. INNERVATION

lateral and medial pectoral nn.

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Pectoralis major m. BLOOD

branches of internal thoracic, lateral thoracic, and thoraco-acromial arteries

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Pectoralis major m. ACTION

ADduct and medially rotate the humerus
Flexes humerus
Flexes and extends humerus, but extends the flexed humerus, depresses and protracts the shoulder girdle by pulling on the humerus.

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Pectoralis minor m. ORIGIN

Ribs 3, 4, 5 near costochondral junction

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Pectoralis minor m. INSERTION

Coracoid process of scapula

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Pectoralis minor m. INNERVATION

medial pectoral n. (penetrates minor m. and then enters major m.)

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Pectoralis minor m. BLOOD

lateral thoracic and thoracoacromial aa. (branches of the axillary a.)

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Pectoralis minor m. ACTION

depresses and protracts the shoulder girdle, helps with inferior rotation of scapula

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Subclavius m. ORIGIN

first costal cartilage

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Subclavius m. INSERTION

inferior side of the clavicle

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Subclavius m. INNERVATION

Nerve to subclavius (small branch of brachial plexus)

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Subclavius m. ACTION

Depresses clavicle and resists lateral dislocation of the clavicle
*Clinically: can act in "splinting" a fractured clavicle, as well as play a role in the protection of nerves and arteries that run inferior to the clavicle through the axillary region

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Serratus Anterior m. ORIGIN

First 8-9 ribs, laterally

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Serratus anterior m. INSERTION

Anterior (deep) side of scapula, along entire medial border

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Serratus anterior m. INNERVATION

Long thoracic n.

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Serratus anterior m. BLOOD

Subscapular and lateral thoracic aa. (branches of axillary a) and lateral branches of the posterior intercostal aa.

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Serratus anterior m. ACTIONS

Protracts the shoulder girdle by pulling scapula anteriorly
Hold scapula against rib cage
Rotates scapula superiorly during abduction of the arm by pulling inferior angle anteriorly.
*Clinically: denervation of the serratus anterior m. results in "winging of the scapula" when patient tries to push anteriorly or flex glenohumeral joint