OINA: Back/Shoulders/Triceps

Question 1

Trapezius

Answer 1

O: Occipital bone, Ligamentum Nuchae, Spine of C7 and spines of all thoracic vertebrae

I: Upper fibers into lateral third of clavicle; middle and lower fibers into acromion and spine of scapula

N: Spinal Accessory nerve (motor), C3,C4 (sensory) XI Cranial nerve

A: Upper fibers - Elevates scapula
Middle fibers - Retract scapula
Lower fibers - depress scapula

Question 2

Latissimus Dorsi

Answer 2

O: Iliac crest, lumbar fascia, spines of lower six thoracic vertebrae, lower 3 or 4 ribs, and inferior angle of scapula

I: Floor of bicipital groove of humerus

N: Thoracodorsal nerve C6,C7,C8

A: Extension, adduction, and Internal rotation

Question 3

Levator Scapulae

Answer 3

O: Transverse processes of 1st four cervical vertebrae

I: Medial border of scapula

N: C4,C3,C5 Dorsal scapular nerve

A: Raise medial border of scapula

Question 4

Rhomboid Minor

Answer 4

O: Ligamentum nuchae and spines of C7, T1

I: Medial border of scapula

N: Dorsal scapular nerve C4,C5

A: Raises medial border of scapula upward and medially

Question 5

Rhomboid Major

Answer 5

O: T2 to T5 of scapula

I: Medial border of scapula

N: Dorsal scapular nerve C4,C5

A: Raises medial border of scapula upward and medially

Question 6

Deltoid

Answer 6

O: Lateral third of clavicle, Acromion, spine of scapula

I: MIddle of lateral surface of shaft of humerus

N: Axillary Nerve C5,C6

A: Abducts arm, anterior fibers flex and medially rotates arm, posterior fibers extend and laterally rotates arm

Question 7

Supraspinatus

Answer 7

O: Supraspinous fossa of scapula

I: Greater tuberosity of humerus capsule of shoulder joint

N: Suprascapular nerve: C4,C5,C6

A: Abducts arm and stabilizes shoulder jt.

Question 8

Infraspinatus

Answer 8

O: Infraspinous fossa

I: Greater tuberosity of humerus and capsule of shoulder jt.

N: Suprascapular nerve C5,C6,C7

A: Laterally rotates arm, stabilizes shoulder jt.

Question 9

Teres Major

Answer 9

O: Lower third of lateral border of scapular

I: Medial lip of bicipital groove

N: Lower subscapular nerve C6,C7

A: Medially rotates and adducts arm and stabilizes shoulder jt.

Question 10

Teres Minor

Answer 10

O: Upper two thirds of lateral border of scapula

I: Greater tuberosity of humerus; capsule of shoulder joint

N: Axillary nerve C4,C5, C6

A: Laterally rotates arm and stabilizes shoulder joint.

Question 11

Subscapularis

Answer 11

O: Subscapular fossa

I: Lesser tuberosity of humerus

N: Upper and lower subscapular nerves C5,C6,C7

A: Medially rotates arm and stabilizes shoulder joint

Question 12

Triceps

Answer 12

O: Long Head - Infraglenoid tubercle of scapula
Lateral head - Upper half of posterior surface of shaft of humerus
Medial head - Lower half of posterior surface of shaft of humerus

I: Olecranon process

N: Radial nerve C6,C7,C8

A: Extensor of elbow jt.

Question 13

Blood Supply of posterior fascial compartment?

Answer 13

Profunda Brachii and ulnar collateral arteries