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Ortho Anatomy ft. MM > Shoulder/ Arm > Flashcards

Shoulder/ Arm Flashcards

1
Q

Anatomic Location of Brachial Plexus

A

Trunks: Above clavicle. Ontop of anterior scalene, lateral to interscalene space.

Divisions: Posterior to clavicle

Cords: Oriented in relation to axiallary a. (med, lat, post). Posterior to pec minor.

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2
Q

Boundaries of the Axilla

A
  • Posterior: subscapularis & teres major
  • Anterior: pec major & minor, subclavius & clavipec fascia
  • Medial: upper seratius anterior.
  • Inferior: 4th rib
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3
Q

Draw the Brachial Plexus

A

Branches:

  1. Dorsal Scapular- Rhomboids, levator scapulae
  2. N. to Subclavisu - Subclavius
  3. Long Thoracic- Serratus Ant.
  4. Suprascapular N. - Supra & Infra
  5. Upper Subscapular N. - Subscapularis & Teres Major
  6. Lower Subscapular N. - Subscapularis & Teres Major
  7. Thoracodorsal - Latissiumus Dorsi
  8. Medial Pectoral N. Pec Minor, Pec Major
  9. Lateral Pectoral N. Pec Major
  10. Med Antebrachial Cutaneous N of Arm - medial sensory to arm
  11. Med Antebrachial Cutaneous N. of Forearm - medial sensory to forearm
  12. Musculocutaneous
  13. Median
  14. Ulnar
  15. Radial
  16. Axillary
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4
Q

Describe the Orientation of the Glenoid & Scapula

A

Glenoid:

  • 7 degrees retroverted, to 10 degrees anteverted
  • 5 degrees superior angulation
  • Reletive to long axis of the scapula (on a sagittal cut, a line bisecting the glenoid through the apex of the scapula)

Scapula:

  • 3 degrees superior tilt
  • Lays 30 degrees anteverted relative to chest wall (hugs the chest wall as it curves around your flank)
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5
Q

Neck Shaft Angle of Humerus

A

130 Degrees compared to transepicondylar axis of humerus

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6
Q

Parsonage Turner Syndrome

A

Neuritis of the brachial plexus

  • Sudden onset pain and paresthesias down the arm

Commonly affects C5, C6, suprascapular n., long throacic n., axillary n.

Self-limiting with prolonged recovery (1-2) years

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7
Q

Scapular Winging (Definitition, Affected Muscles & Associated N.)

A

Def’n: Deviation of the apex of the scapula reletive to its normal orientation

  • Medial: Serratus Ant (Long Thoracic N.)
  • Lateral:
    • Rhomboids (Dorsal Scapular N.)
    • Trapezius (Accessory N. [CNXI])
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8
Q

Preclavicular Branches of Brachial Plexus

A
  1. Dorsal Scapular N.
  2. Long Throacic N.
  3. N. to Subclavius
  4. Suprascapular N.
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9
Q

Coracohumeral Ligament (Attachements? Function?)

A

Attachements: Base of coracoid to superior aspect of anatomic neck of humerus

Function: Resists superior translation and ER (similar to SGHL)

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10
Q

Attachements to the Coracoid (Ligaments & Tendons)

A

Ligaments:

  1. Coracoclavicular Ligaments
    1. Trapezoid (lateral)
    2. Conoid (medial)
  2. Coracohumeral Ligament
  3. Coracoacromial Ligmaent

Tendons:

  1. Coracobrachialis
  2. Pec Minor
  3. Short Head of Biceps
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11
Q

Grading of AC Joint Injuries

A
  1. No displacement: AC and CC ligaments intact. Sprain.
  2. Disruption of AC ligaments, <50% displacement. CC ligaments intact
  3. 50-100% displacement. AC and CC ligaments disrupted.
  4. Posterior dislocation of the clavicle into trapezius fascia
  5. 100-300% displacement of clavicle. AC, CC disrupted. Deltoid and trapezial fascia disrupted.
  6. Clavicle displaced inferior to coracoid
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12
Q

Muscles Connecting the Upper Limb to the Thoracic Wall

A
  1. Serratus Anterior
  2. Pec Major
  3. Pec Minor
  4. Subclavius
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13
Q

Muscles Connecting the Upper Limb to the Vertebral Column

A
  1. Trapezius
  2. Latissimus
  3. Rhomboid Major & Minor
  4. Levator Scapulae
  5. Sternocleidomastoid*
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14
Q

Variations in the Capsolabral Complex

A
  1. Sublabral Foramen: detatchment of the anteriosuperior labrum. Does not extend past 3’o’clock
  2. Sublabral Recess: detatchment of the superior labrum often mistaken for SLAP tear
  3. Buford Complex: Congenital abscence of anterosuperior labrum with cord-like MGHL. Present in approx 2% of population.
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15
Q

Inferior Glenohumeral Ligament (IGHL)

A
  • Anterior IGHL:
    • Resist inferior translation
    • Effective in 90 degrees abduction
  • Posterior IGHL
    • Resists posterioinferior translation
    • Effective in IR and Adduction with shoulder flexed
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16
Q

Middle Glenohumeral Ligment (MGHL)

A
  • Resists inferior translation and ER
  • Effective in 45 degrees abduction
17
Q

Superior Glenohumeral Ligament (SGHL)

A
  • Resists Inferior translation and ER to a lesser extent
  • Effective in Adduction with no shoulder flexion
18
Q

Capsualar Ligaments of the Shoulder

A
  1. SGHL
  2. MGHL
  3. IGHL (anterior and posterior)
19
Q

Types of Sternoclavicular Joint Dislocations

A

Type A: Posterior Dislocation (requires surgical reduction with thoracics incase of pleural damage)

Type B: Anterior Dislocation

20
Q

Ligaments Attached to the Scapula (Extrinsic & Intrinsic)

A
  • Extrinsic:
    • Acromioclavicular
    • Coracohumeral
    • Coracoclavicular (conoid & trapezoid)
  • Intrinsic
    • Superior Transverse Scapular Ligament (runs over suprascapular notch)
    • Inferior Transferse Scapular Ligament (glenoid rim to base of acromion
    • Coracoacromioligament
21
Q

Ligaments of the Sternoclavicular Joint

A
  1. Anterior sternoclavicular ligament
  2. Posterior sternoclavicular ligament
  3. Intraclavicular ligament
  4. Costoclavicular ligaments
22
Q

Subscapularis Management

A
  1. Subscap Peel
  2. Subscap Tenotomy
  3. Subscap Split
  4. Osteotomy
23
Q

Superior Shoulder Suspensory Complex (SSSC)

A
  1. Glenoid
  2. Acromion
  3. Coracoid
  4. AC Joint
  5. CC Ligaments
  6. Distal Clavicle

Disruption of 2 of the above makes an unstable ring and can be a *soft* indication for surgical fixation.

24
Q

Glenohumeral Joint Stabilizers (Static & Dynamic)

A

Static:

  • Bony Articulation
  • Labrum
  • Capsulular Ligaments
  • Negative Pressure

Dynamic:

  • Long head biceps
  • Rotator Cuff x4
  • Scapulothoracic motion
25
Q

Blood Supply to Humeral Head

A
  • Mostly (~60%) posterior humeral circumflex a. (JBJS 2010)
  • Previously thought to be from acuate artery branch off of anterior humeral circumflex a.
26
Q

Location, Sections & Branches of the Axillary A.

A

3 sections based on proximity to pec minor. Transitions from subclavian to axiallary a. at 1st rib. Transitions to brachial a. at pec major.

  • 1st section: between 1st rib and pec minor
    • Supreme Thoracic A.
  • 2nd section: posterior to pec minor
    • Lateral Thoracic A.
    • Thoracoacromial A.
      • Deltoid A.
      • Acromial A.
      • Pectoral A.
      • Clavicular A.
  • 3rd section: distal to pec minor, proximal to teres major. (most susceptible to vascular injury)
    • Supscapular A.
    • Anterior Humeral Circumflex A.
    • Posterior Humeral Circumflex A.
27
Q

Brachial Plexus Palsies

A
  1. Erb Palsy
    • C5C6
    • Waiter’s tip (weak deltoid, elbow flexors, suprascapular n.)
    • Best prognosis
  2. Klumpke’s Palsy
    • C8T1
    • Weak wrist extensors & intrinsics
    • Often associated with Horner’s Syndrome
  3. Total Arm Palsy
    • Flaccid Limb
    • Worst prognosis for recovery
28
Q

Rotator Interval Boarders & Contents

A

Boarders: Supraspinatus & Subscapularis

Contents:

  1. Long head of Biceps
  2. Coracohumeral Ligament
  3. SGHL
  4. Thin Layer of Capsule
29
Q

Biceps Pully

A

Functions to hold long head of biceps in the groove. Listed prox to distal:

  1. Coracohumeral Ligament
  2. SHGL
  3. Subscapularis
30
Q

Quadrangular Space Boarders & Contents

A

Boarders: Long Head Triceps, Humerus, Teres Minor, Teres Major

Contents: Axillary n., posterior humeral circumflex a.

31
Q

Triangular Space Boarders & Contents

A

Boarders: Teres Minor, Teres Major, Long Head Triceps

Contents: Circumflex scapular a.

32
Q

Triangular Interval Boarders & Contents

A

Boarders: Humerus, Long Head Triceps, Teres Major

Contents: Radial N., profunda Radial a.

33
Q

Label the Diagram Below

A
  1. Pectoralis Major
  2. Biceps Tendon (Short Head)
  3. Biceps Tendon (Long Head)
  4. Deltoid
  5. Humeral Head
  6. Glenoid
  7. Teres Minor
  8. Deltoid
  9. Infraspinatus
  10. Supbscapularis
  11. Coracobrachialis
  12. Pec Minor

Ortho Anatomy ft. MM (10 decks)

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