Gross Anatomy - Shoulder

Question 1

What make up the boundaries of the quadrangular space?

Answer 1

Teres minor (superior)
Teres major (inferiorly)
Long head of triceps (medially)
Humerus (laterally)

Question 2

What structures pass through the quadrangular space?

Answer 2

Axillary nerve and posterior circumflex humeral artery

Question 3

What make up the borders of the triangular space?

Answer 3

Teres major (superiorly)
Long head of triceps (medially)
Humerus (laterally)

Question 4

What structures pass through triangular space?

Answer 4

Radial nerve

Deep brachial artery

Question 5

innervation of pectoralis major

Answer 5

Medial C8-T1 and lateral C5-7 pectoral nerves

Question 6

Innervation of pectoralis minor

Answer 6

Medial pectoral nerves (C8-T1)

Question 7

Innervation and action of serratus anterior

Answer 7

Long thoracic nerve (C5-7)

Protracts scapula

Question 8

Innervation and action of deltoid

Answer 8

Axillary nerve (C5,6)

middle fibres - abduction (10-110 degrees)

Posterior fibres - Extension and lateral rotation

Anterior fibres -
Flexion and medial rotation

Question 9

What is found in the deltopectoral groove and what is its function?

Answer 9

Cephalic vein

Drains blood from skin of hand, forearm and medial arm

Question 10

Innervation and action of subscapularis

Answer 10

Upper and lower sub scapular nerves (C5,6)

Medial rotation of arm

Question 11

Origin and insertion of subscapularis

Answer 11

Subscapular fossa

Lesser tubercle of humerus

Question 12

Origin and insertion of Infra-spinatus

Answer 12

infraspinous fossa of scapula

Middle facet of greater tubercle

Question 13

Origin and insertion of supra-spinatus

Answer 13

Supraspinous fossa of scapula

Upper facet of greater tubercle of humerus

Question 14

Action and innervation of of supraspinatus

Answer 14

First 10 degrees of abduction

Suprascapular nerve (C5,6)

Question 15

Action and innervation of infra-spinatus

Answer 15

Suprascapular nerve (C5,6)

Lateral rotation

Question 16

Action and innervation of Teres minor

Answer 16

Lateral rotation

Axillary nerve (C5,6)

Question 17

Origin and Insertion of Teres minor

Answer 17

Upper 2/3rd lateral border of scapula

Lower facet of greater tubercle

Question 18

When does axillary artery become brachial artery?

Answer 18

Inferior margin of Teres major

Question 19

What division of axillary artery sits proximal to pec minor?

Answer 19

Superior thoracic

Question 20

What division of axillary artery sits distal to pec minor?

Answer 20

sub scapular, ant and post circumflex humeral artery

Question 21

What division of axillary artery sits posterior to pectoralis minor?

Answer 21

Thoracoacromial and lateral thoracic artery