Muscles Flashcards
Which nerve innervates the supraspinatus m.?
Suprascapular n. (C5,6)
What is the origin of the Supraspinatus m.?
Superior scapula
What is the insertion of the supraspinatus m.?
Sup. Facet of greater tuberosity of humerus
What is the action of the supraspinatus m?
Abduction, first 30°, then over 90°
What nerve innervates the infraspinatus m.?
Suprascapular n.(C5,6)
What is the origin of the infraspinatus m?
Inferior scapula
What is the insertion of the infraspinatus m?
Middle facet of greater tuberosity (back of humerus)
What is the action of the infraspinatus m?
External rotation (primary)
What nerve innervates the teres minor m.?
Axillary n. (C5,6)
What is the origin of the teres minor m?
Lateral border of scapula
What is the insertion of the teres minor m?
Inferior facet of greater tuberosity (back ofhumerus)
What are the two actions of the teres minor m.
Adduction (primary) External rotation (secondary)
Which nerve innervates the subscapularis m?
Upper & lower subscapular n. (C5,6)
What is the origin of the subscapularis m.?
Anterior scapula
What is the insertion of the subscapularis m?
Lesser tuberosity (medial side of humerus)
Which rotator cuff muscle is responsible for internal rotation?
Subscapularis
Which nerve innervates the Latissimus Dorsi m.?
Thoracodorsal (C6,7,8)
What is the origin of the Latissimus Dorsi m.?
Iliac crest, inferior 4 ribs, spinous T6 to sacrum
What is the insertion of the Latissimus Dorsi m.?
Floor of intertuberculer groove (on humerus)
Which N. Innervates the serratus anterior m?
Long thoracic (C5,6,7) SALT
What is the insertion of the serratus anterior m.?
Anterior + medial surface of vertebral border of scapula
Which muscle protracts the shoulder?
Serratus anterior
Damage to what nerve causes winging of scapula?
Long thoracic (C5,6,7)
Damage to what nerve causes flaring of the scapula?
Dorsal scapular (C5)
Which nerve innervates both rhomboid minor and major?
Dorsal scapular (C5)
What is the origin of the rhomboid minor m.?
SPs, C7-T1
Where is the origin of the rhomboid major m?
SPs, T2-T5
What is the insertion point of both rhomboid major and minor?
Medial border of scapula
Which muscles adduct and retract the scapula?
Rhomboid minor and major
Which nerve innervates the deltoid m?
Axillary (C5,6)
Where does the deltoid m. Originate?
Around AC joint
Where does the deltoid m. Insert?
Deltoid tuberosity of humerus
Which shoulder m. Abducts, adducts, flexes, and extends the shoulder?
Deltoid m
Which nerve innervates the Levator scapulae m.?
Dorsal scapular (C5,6)
What is the origin of the Levator scapulae?
TPs of C1-C4
What is the insertion of the Levator scapulae?
Superior/medial border of scapula
Which muscle elevates the scapula only?
Levator Scapulae
Which muscle elevates, depresses, and retracts the scapula?
Trapezius
Which 2 nerves innervate the trapezius?
CN XI
C3,4
Where does the trapezius m. originate?
Medial superior nuchal line, EOP, ligamentum nuchae, SPs C7-T12
Where does the trapezius m. Insert?
Lateral 1/3 clavicle, acromion, spine of scapula
Which nerves innervate the Pec. Major m.?
Medial (C8,T1) & lateral (C5,6,7) pectoral nerves
Where is the origin of the clavicular head of the pec. major m.?
Anterior surface med 1/3 clavicle
Where is the origin of the sternal head of the pec. major m.?
Manubrium & body of sternum
Where is the origin of the abdominal head of the pec. major m.?
Costal cartilages of ribs 2-6
Where is the insertion for pec. major?
Lateral lip of intertubercular groove
Which muscle flexes, adducts, and internally rotates humerus at shoulder joint?
Pec major
Which nerve innervates the Pec. Minor?
Medial pectoral N
Where does pec. minor originate?
3-5th ribs
