Name the divisions of the Brachial Plexus
Roots
Trunks
Cords
Divisions
Branches
The anterior rami is what section of the brachial plexus?
Roots: C5, C6, C7, C8, & T1
Anterior and Posterior Nerve Roots are also called:
- _________
- _________
The Posterior contains (a)_______ neurons that carry info TO the CNS?
The Anterior contains (b)______neurons that carry info AWAY from the CNS?
- Dorsal
- Ventral
A) Sensory Neurons
B) Motor Neurons
WHAT IS THE AXILLA & its contents?
The AXILLA consists of an apex formation with 4 walls and a base.
All of the nerves and vessels of the upper limb pass throught this canal (cervicoaxillary canal)
What muscles form the Anterior Wall of the Axilla?
Axilla Anterior Wall
- Pectoralis Major
- Pectoralis Minor
- Subclavius muscle
What muscles form the posterior wall of the Apex?
Posterior Wall
- Subscapularis
- Teres Major
- Latissimus Dorsi
Subscapularis
O:
I:
A:
N:
Subscapularis (anterior to scapula)
O: Scapular Fossa
I: Lesser Tubercle of Humerus
A: Medial Rotation of GHJ
N: Superior/Inferior Subscapular Nerves
(brachial Plexus: C7; Cords; Posterior [forms radial nerve] )
What muscles form the MEDIAL WALL of the Axilla?
Medial Wall-Thoracic Wall
- Ribs 1-4
- Serratus Anterior
What muscles form the LATERAL WALL of the Axilla?
HINT: Bicipital Groove
Lateral Wall
- Latissimus Dorsi (attaches to intertubercular groove [Bicipital Groove] )
What forms the BASE of the Apex?
Base or Floor of the Apex
- Skin/facia of the concave axilla (armpit)
The AXILLARY ARTERY is divided into what 3 parts by the _______ minor?
AXILLARY ARTERY
Divided into 3 parts by PECTORALIS MINOR
- Superior Thoracic Artery
- Two Branches: Thoracoacromial trunk, Lateral Thoracic
- Three Branches: Subscapular, Anterior Circumfles Humeral, Posterior Circumflex Humeral
The Subclavius & Suprascapular Nerves branch off of which trunk?
A) Superior
B) Middle
C) Inferior
Subclavius & Suprascapular Nerves branch off of the
SUPERIOR trunk
(C5/C6 Anterior Rami)
&
Subclavius N. =Subclavius M.
Suprascapular N. = Infraspinatus, Supraspinatus, & GHJ
Which division of the Brachial Plexus are FLEXORS, EXTENSORS?
ANTERIOR Division: FLEXORS
POSTERIOR Division: EXTENSORS
Brachial Plexus:
What are the 3 divisions of the Cords
Lateral Cord:
Posterior Cord:
Medial Cord:
Lateral Cord:
What cervical vertebra do the Lateral Cords originate from?
What Nerve branches directly from the lateral cord?
What Terminal Nerve comes after?
Lateral Cord:
C5/C6/C7 Anterior Rami (flexor & Posterior Extensor);
Lateral Pectoral Nerve branch;
Forms the Musculocutaneous/Median Terminal Branches
Posterior Cord:
The Posterior Cord contains what 4 subcords?
Posterior Cord
Superiorly = 1. Axillary N.
Inferiorly = 2. Superior Subscapular N.; Thoracodorsal N.; Inferior Subscapular N.
Medial Cord:
The Medial Cord contains what 4 subcords?
Medial Cord:
- Medial Pectoral
- Medial Cutaneous (arm)
- Medial Cutaneous (forearm)
