Anatomy - shoulder/upper extremity

Question 1

Origin and insertion of deltoid

Answer 1

O: Spine of scapula, acromion, lateral 1/3 of clavicle
I: deltoid tuberosity of humerus

Question 2

Action, innervation, and blood supply of deltoid

Answer 2

A: anterior portion- flexes and internally rotates arm. Middle portion - abducts arm beyond 15 degrees
posterior portion - extends and laterally rotates arm
I: Axillary nerve (C5, C6)
BS: posterior circumflex humeral artery

Question 3

Origin and insertion of supraspinatus

Answer 3

O: Supraspinous fossa of scapula and deep fascia
I: greater tubercle of humerus

Question 4

Action, innervation, and blood supply of supraspinatus

Answer 4

A: 1st 15% of abduction of arm
I: suprascapular n. (C4-C6)
BS: suprascapular a.

Question 5

Origin and insertion of infraspinatus

Answer 5

O: infraspinous fossa of scapula
I: greater tubercle of humerus

Question 6

Action, innervation, and blood supply of infraspinatus

Answer 6

A: external rotation of arm
I: suprascapular n. (C5-C6)
BS: suprascapular a.

Question 7

Origin and insertion of teres minor

Answer 7

O: posterolateral border of scapula
I: greater tubercle of humerus

Question 8

Action, innervation, and blood supply of teres minor

Answer 8

A: external rotation of arm
I: axillary n. (C5-C6)
BS: circumflex scapular a.

Question 9

Origin and insertion of subscapularis

Answer 9

O: subscapular fossa
I: lesser tubercle of humerus

Question 10

Action, innervation, and blood supply of subscapularis

Answer 10

A: holds humeral head to glenoid cavity, internally rotates arm, adducts arm
I: upper and lower subscapular n. (C5-C7)
BS: subscapular a./lateral thoracic artery

Question 11

Origin and insertion of teres major

Answer 11

O: posteroinferior angle of scapula
i: intertubercular sulcus of humerus

Question 12

Action, innervation, and blood supply of teres major

Answer 12

A: adducts and internally rotates arm
i: lower subscapular n. (C5-C6)
BS: circumflex scapular a.

Question 13

muscles of rotator cuff

Answer 13

Supraspinatus, infraspinatus, teres minor, subscapularis

Question 14

Borders of quadrangular space

Answer 14

Superiorly: inferior border of teres minor
Laterally: surgical neck of humerus
medially: lateral border of long head of triceps
inferiorly: superior border of teres major

Question 15

Borders of triangular space

Answer 15

Superiorly: inferior border of teres minor
Laterally: medial border of long head of triceps
inferiorly: superior border of teres major

Question 16

Army goes over the bridge and Navy goes under

Answer 16

Suprascapular Artery goes over Superior transverse scapular ligament and suprascapular Nerve goes under.