What's the only muscle of the pectoral region that inserts on the humerus?

Pectoralis Major

What are the Pectoral region Muscles?

1. Pectoralis Major

2. Pectoralis Minor

3. Subclavius

4. Serratus Anterior

What are the three portions of the sternum?

1. Manubrium

2. Body

3. Xiphoid Process

What's the articulation of the Manubrium and the body of the sternum called? What is this a landmark for?

Sternal Angle, which usually represents the attachment of the second costal cartilage/2^nd rib

Only what fraction of the head of the humerus makes contact with the glenoid cavity?

1/3

The musculotendinous cuff, or the rotator cuff, maintains the stability of the  _____________.

Shoulder Joint

What are the Rotator cuff muscles?

1. Supraspinatous

2. Infraspinatous

3. Teres Minor

4. Subscapularis

All major nerve plexuses are formed from...

All major nerve plexuses are formed from Ventral 1° Rami

What Ventral Primary Rami form the Brachial Plexus?

C₅ →T₁ Ventral 1° Rami

How many major branches of the Brachial Plexus are there?

16

Especially in the elderly, where is the weakest part of the clavicle?

The junction between the middle 1/3 and lateral 1/3 of the clavicle

Why are scapular fractures (not involving the acromion) relatively uncommon?

1. Muscular support

2. Thoracic wall support

The most commonly fractured portion of the scapula is what?

The acromion (subcutatneous portion)

The most fractured portion of the humerus is what?

The surgical neck of the humerus

What are the two injuries that axillary nerve is most susceptible to?

1. Surgical Neck Fracture

2. Shoulder Dislocation

Deltoids and Teres Minor are innervated by what nerve?

Axillary Nerve C_5,6

What nerve of the upper limb supplies 13 muscles, none of which are in the hand?

Radial Nerve C_[5]6-8, [T₁]

A young man experiences an injury in the radial (spiral) groove on the posteriolateral aspect of the humerus. A lesion to this nerve will cause what physical disorder?

A Radial Nerve lesion in the Spiral groove will cause Wrist drop

What are the two locations where the Radial nerve is susceptible to lesion that could result in wrist drop?

1. Axilla

2. Radial/Spiral Groove

What nerve lies on the distal portion of the humerus carrying cord levels C_[5]6-8, T₁?

Median Nerve

What nerve represents the terminal branch of the posterior cord of the Brachial Plexus?

Radial Nerve C_[5]6-8, [T₁]

What nerve can be found coursing behind the medial epicondyle of the humerus?

Ulnar Nerve C₇-T₁

The nerve supplying 90% of motor innervation to the hand would be what?

Ulnar Nerve C₇-T₁

What nerve supplying motor innervation to the hand will enter the Carpal Canal, and compression of it will cause Carpal Tunnel Syndrome?

Median Nerve C_[5]6-8,[T₁]

The 1^st thoracic segment of the spinal cord on the left side is severed in a man involved in a tragic chainsaw accident. It's safe to say that he's lost all muscles in what structure?

The hand; T₁ provides motor innervation to the intrinsic muscles of the hand ("Lose T₁, lose the hand"- Dr. Jackson)

A man with Horner's syndrome is having trouble with his hands functioning as time progresses. This is probably due to what?

Gradual loss of T₁ innervation to the intrinsic muscles of the hand

Name the carpal bones

1. Scaphoid

2. Lunate

3. Triquetrum

4. Pisiform

5. Trapezium

6. Trapezoid

7. Capitate

8. Hamate

An old man falls and fractures a carpal bone. The odds would point towards what bone being fractured?

Scaphoid, the most lateral bone in the proximal row, is the most frequently fractured carpal bone

An old woman playing tennis dislocates a carpal bone in her right wrist. Which bone is most likely dislocated?

The Lunate

What does carpal bone visibility allow one to figure out about a child?

Age