Prelab Lecture 3

Question 1

What is the quadrangular space boundaries?

Answer 1

Sup: teres minor
Inf: teres major
Medial: long head of triceps brachii 
Lat: surgical neck of humerus 
Ant: subscapularis

Question 2

What runs thru the quadrangular space?

Answer 2

Axillary nerve + posterior circumflex humeral artery + vein

Question 3

What does the axillary nerve supply?

Answer 3

Deltoid + teres minor

Question 4

Supraspinatus 
O
I
A
IN

Answer 4

O: Supraspinatus fossa of scapula
I: Greater tubercle of humerus
A: adduction of arm
In: Suprascapular nerve

Question 5

Infraspinatus
O
INS
A
IN

Answer 5

O: Infraspinatous fossa of scapula
I: Greater tubercle of humerus
A: Ext. rotation of arm
N: supra scapular nerve (C4-C6)

Question 6

Teres Minor
O
INS
A
In

Answer 6

O: upper two thirds of lateral margin of scapula
Ins: greater tubercle of humerus
Action: ext. rotation adduction of arm
In: axillary nerve

Question 7

What are the rotator cuff muscles?

Answer 7

Supraspinatus, infraspinatus, teres minor

Subscapularis

Question 8

Subscapularis
O
In
A
Inn

Answer 8

O: sub scapular fossa of scapula
In: lesser tubercle of humerus
A: internal rotation + extension of arm
Inn: sub scapular nerve

Question 9

Is teres major a rotator cuff muscle? What is it innervated by?

Answer 9

NO, innervated by lower sub scapular nerve

Question 10

What does the suprascapualr notch + superior transverse scapular ligament transmitting?

Answer 10

Subscapular nerve + suprascapular artery

Question 11

What are the boundaries of the axilla?

Answer 11

Anterior wall: clavicle, pectorals major + minor
Posterior wall: scapula, subscapularis, teres major, latissimus doors
Medial: ribs + serrates anterior muscle
Lateral: inter tubercular groove of humerus + long head of biceps brachii
Base: skin covering armpit
Apex: clavicle ventrally, superior border of scapular dorsally, 1st rib medially

Question 12

Identify the parts + branches of the axillary artery

Answer 12

Subclavian- > thyrocervical trunk-> axillary -> thoracoarcomial artery + trunk ->(subscapular -> circumflex scapular -> thoracodorsal) -> posterior circumflex humeral

Question 13

Identify the branches of the thyrocervical artery

Answer 13

Subclavian -> thyrocervical -> suprascapular + transverse cervical arteries

Question 14

What is the relationship of the brachial plexus to the axillary artery?

Answer 14

Posterior cord is posterior to axillary artery