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Flashcards in Muscles of the Shoulder Deck (63):
1

These muscles cross the shoulder joint to insert in the arm and therefore actually move the arm.

Muscles of the shoulder

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The 6 intrinsic shoulder muscles

Deltoid, Infraspinatus, subscapularis, supraspinatus,teres major, teres minor

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Large fan shaped muscle that covers superior part of thorax

Pectoralis Major

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Muscle of the shoulder that has two heads, on clavicular and one sternum forming the anterior wall of the axilla (anterior axillary wall)

Pectoralis Major

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This muscle is a powerful adductor of the arm and medial rotator of the humerus, and its two parts can activate separately

Pectoralis Major

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Originates at clavicle, sternum, and ribs 1-6 cartilage

Inserts into intertubercular sulcus of the humerus

Pectoralis Major

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Innervated by the lateral and medial pectoral nerves, which arise from the brachioplexus

Pectoralis Major

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Flexus, adducts, and rotates the humerus medially

Pectoralis Major

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Widest muscle on the posterior side of the thorax, covers half of back (trunk) and inserts into the humerus

Latissimus Dorsi

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Forms the posterior axillary fold

Latissimus Dorsi

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Extends, Retracts, and rotates the humerus medially

Ex: touching scapula on the opposite side

Latissimus Dorsi

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Powerful adductor of the humerus when working with the pectoralis major.

Ex: Important in restoring the upper limb to the shoulder from an abducted position like in climbing

Latissimus Dorsi

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Raises the trunk to the arm like pullups

Latissimus Dorsi

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Originates at thoracolumbar, or lumbardorsal fascia

Latissimus Dorsi

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A wide band of fascia, like an aponeurosis that originates of spinous processes of T7-T12, the lumbar vertabrae, iliac crest, and sometimes the inferior angle of the scapula

Lumbodorsal Fascia

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Inserts into intertubercular groove of the humerus

Latissimus Dorsi

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Innervated by the thoracodorsal nerve

Latissimus Dorsi

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Extends retracts and rotates the humerus medially and is a powerful adductor and depresses the shoulder

Latissimus Dorsi

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Good area to hear the lungs because its not covered by muscle, good for identifying muscles

Triangle of Ausculation

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Rounded part of the shoulder, shaped like triangle, divided into three parts

Deltoid

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Anterior fibers in deltoid aid the pectoralis major in

flexing the arm and medial rotation

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Posterior fibers of deltoid aid the latissimus dorsi with

extending the arm and lateral rotation

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Posterior and anterior fibers do what to the arm while walking?

Swings the arm

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Stabilizes the shoulder joint by holding the head of the humerus in the glenoid cavity during shoulder movement

Deltoid

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Involved in abductory movement esp avove 15 degrees

Deltoid

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Axillary nerve runs deep to it from behind

Deltoid

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Originates from the lateral one third of clavicle, acromion process, and the lateral aspect of the spine of the scapula

Inserts into deltoid tuberosity on humerus

Deltoid

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Muscle that is trianglular and fills in the subscapular fossa and inserts into the lesser tubercle

Subscapularis

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This rotator cuff muscle is the primary medial rotator of the arm

Subscapularis

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Rotator cuff muscles do what to the humerus in the glenoid cavity?

Hold the head inside of it

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Helps to form part of posterior axillary fold along with latissimus dorsi

Subscapularis

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Origin is from the deep side of the scapula - the subscapular fossa (costal surface of the scapula) and inserts and at the lesser tubercle

Subscapularis

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Inervated by the subscapular nerve

Subscapularis

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Occupies the supraspinous fossa and inserts into the greater tubercle of the humerus

Supraspinatous

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To view this muscle, the trapezius and the deltoid must be reflected

Supraspinatus

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Muscle that initiates abduction until 15 degrees away from body.

Supraspinatus

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Origin is supraspinous fossa and insertion is in the greater tubercle of the humerus.

Supraspinatus

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Innervated by the suprascapular nerve

Supraspinatus

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Also helps to stabilize the shoulder during rotation

And prevents downward dislocation of the humerus when carrying a suitcase

Supraspinatus

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Muscle that occupies the infraspinous fossa and inserts into the greater tubercle of the humerus.

Infraspinatus

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Also must reflect the deltoid and the trapezius for this muscle

Infraspinatus

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A powerful lateral rotator of the humerus

Originates from infraspinus fossa of the scapula and inserts in the greater tubercle just posterior to the supraspinatus

Infraspinatus

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Innervated by the suprascapular nerve

Infraspinatus

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Narrow muscle that is not distinct from infraspinatus having the same action as the infraspinatus

Teres Minor

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Origin is on the lateral border of the posterior surface of the scapula and insertion is on the greater tubercle, posterior to the infraspinatus

Teres minor

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Innervated by the axillary nerve and has same action as infraspinatus (rotates laterally and stabilizes)

Teres minor

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Rotator cuff muscles can also be called

Scapulohumeral muscles

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Have a steadying effect on the head of the humerus and rotate in the glenohumeral joint

Rotator Cuff

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All muscles of rotator cuff help rotate the humerus except the...

supraspinatus

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All 4 rotator cuff muscles do this to hold the humeral head

Tonic contraction

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The most commonly injured injury occurs with the...

Supraspinatus

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Tearing of this muscle may follow dislocation of the humerus and

degenerative tendonitis is common in older people

ex of injury: Violently pushing into abduction like checking a shoulder into a board or throwing the ball hard or swimming.

rotator cuff muscle

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To diagnose, person is asked to lower their arm from a 90 degree angle. If injured, limb will quickly drop to the side.

Rotator cuff muscle

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Thick cylinder shaped muscle, forms rounded area on the inferior lateral third of scapula when arm is abducted against resistance and helps form posterior axillary fold with the latissimus dorsi

Teres Major

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Adducts and medially rotates the arm and is important stabilizer of humeral head by holding it in place against the pull of the deltoid

Teres Major

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Originates off the posterior surface of the scapula along the inferior angle and nserts into the intertubercular sulcus of the humerus and the tendon fuses with the latissimus dorsi

Teres Major

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Innervated by the subscapular nerve

Teres Major

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Adducts extends and medially rotates the arm, like the lattisimus dorsi

Teres major

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Name the three muscles that insert in the intertubercular sulcus. There is a major on both sides.

Pectoralis Major (laterally)
Latissimus Dorsi (intermediate)
Teres Major (medial)

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Extends from the corocoid process to the brachium

Coracobrachialis

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The musculocutaneous nerve runs right through it

Coracobrachialis

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Originates from the corocoid process and inserts on medial surface of the humerus.

Coracobrachialis

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Flexes and adducts the arm

Coracobrachialis