Shoulder and Pectoral

Question 1

What are some of the dermatome landmarks of the pectoral region?

Answer 1

• C5: clavicle
• T4: nipples
• T10: umbilicus

Question 2

What are the muscles of the rotator cuff?

Answer 2

S- Supraspinatus
I- Infraspinatus
T- Teres minor
S- Subscapularis

Question 3

What are the four unique spaces of the shoulder?

Answer 3

• Suprascapular notch (Army over Navy)
• Quadrangular space (Question All Patients)
• Triangular interval (don’t Treat Individuals Profoundly Radical)
• Triangular space (Treat Specimens Cautiously)

Question 4

What is contained within the quadrangular space?

Answer 4

• Axillary nerve

- Posterior circumflex humeral artery

Question 5

What is contained within the triangular interval?

Answer 5

• Profundus brachii artery

- Radial nerve

Question 6

What is contained within the triangular space?

Answer 6

-Circumflex scapular artery (lower subscapular nerve)

Question 7

What are the 3 branches of the axillary artery? What are the branches described in relation to?

Answer 7

Branch 1, proximal: Screw (Superior thoracic artery)
Branch 2, posterior: The Lawyer (Thoracoacromial trunk and Lateral thoracic artery)
Branch 3, distal: Save A Patient (Subscapular, Posterior circumflex humeral, Anterior circumflex humeral arteries)
*Branches described spatially in relation to pectoralis minor m.

Question 8

What are the 3 branches of the subclavian artery? What are the branches described in relation to?

Answer 8

Branch 1, proximal: VITamin (Vertebral artery, Internal thoracic artery, Thyrocervical trunk)
Branch 2, posterior: C (Costocervical trunk)
Branch 3, distal: sometimes D (Dorsal scapular artery)
*Branches described spatially in relation to anterior scalene m.

Question 9

Distinguish the supraclavicular nerve vs. suprascapular nerve vs. subscapular nerve

Answer 9

• Supraclavicular: originate from Erb’s point of the cervical plexus and provide sensory innervation of the skin above and below clavicle
• Suprascapular: travels ant. to post. and innervates supraspinatus m. and infraspinatus m.
• Subscapular: lower and upper portions innervate the subscapularis muscle (anterior scapula)