TOS + Brachial Plexus Anatomy Flashcards
The Brachial Plexus !!!
Med→ Lat: Remember To Drink Cold Beer
Branches→ MARMU: Musculocutaneous, Axillary, Radial, Median, Ulnar
Roots:
go from___ to ____
C5-T1
Ventral Rami
Trunks:
Upper (Sup), Middle, Lower (Inf)
- Upper (Sup)→ C5-C6
- Middle → C7
- Lower (Inf)→ C8-T1
3 Anterior Divisions
3 Posterior Divisions
Anterior Divisions innervate____
FLEXORS
3 Anterior Divisions
3 Posterior Divisions
Posterior Divisions innervate _______
EXTENSORS
3 Anterior Divisions
3 Posterior Divisions
- 3 Anterior innervate Flexors
- 3 Posterior innervate Extensors
3 Cords and their Terminal Branches
- Lateral Cord*
- Posterior Cord
- Medial Cord*
*NOTE: BOTH lateral and medial cords contribute to the Median Nerve
3 Cords and Terminal Branches
Lateral Cord
- Formed from:
- Anterior Divisions
- Upper and Middle Trunks
- Branches:
- Musculocutaneous
- Median
3 Cords and their Terminal Branches
Posterior Cord
- Formed from:
- Posterior Divisions of all 3 trunks
- Branches:
- Radial
- Axillary
3 Cords and their Terminal Branches
Medial Cord
-
Formed from:
- Anterior Division of Lower (Inf) Trunk
-
Branches:
- Ulnar
- Median* (also Lateral Cord)
Thoracic Outlet divided into four regions:
Med→ Lat
1-4
- Sternocostovertebral
- Scalene Triangle (Scalene Groove)
- Costoclavicular Space
- Pectoralis Minor Space
1.Sternocostovertebral Space
-
Boundaries:
- Ant→ Sternum
- Post→ Spinal column
- Lateral→ First rib
-
Contents:
- roots of plexus
- subclavian artery and vein
- jugular vein
- neck lymphatics
- apex of lung and pleura
- sympathetic trunk
2.Scalene Triangle (Scalene Groove)
-
Boundaries:
- Ant→ anterior scalene
- Post→ middle scalene
- Base→ first rib
-
Contents:
- Roots + Trunks of plexus
- subclavian aa.
3.Costoclavicular Space
-
Boundaries:
- Sup→ clavicle
- Inf→ first rib
-
Contents:
- Divisions of plexus
- subclavian aa and vein
4.Pectoralis minor Space
-
Boundaries:
- Sup→ coracoid process
- Ant→ Pec minor
- Post→ Chest wall
-
Contents:
- Cords of plexus
- Subclavian aa and vein
