Lecture Exam 2 - Pectoral Region, Axilla and the Brachial Plexus

Greater Tubercle

Lesser Tubercle

Intertubercular Sulcus

Pectoralis Major

Clavicle, Sternum, Ribs

Origin of Pectoralis Major

Intertubercular Sulcus

Insertion of Pectoralis Major

Adducts and medially rotates the humerus

Action of Pectoralis Major

Latissimus Dorsi

T7 to L5 spinous processes; Sacrum and Iliac Crest

Origin of Latissimus Dorsi

Intertubercular Sulcus

Insertion of Latissimus Dorsi

Adducts, extends, and medially rotates the humerus

Action of Latissimus Dorsi

Anterior Axillary Fold

Posterior Axillary Fold

Axillary Sheath

contains Axillary Artery, Axillary Vein, and Brachial Plexus

Axillary Artery

Subclavian artery

Artery that is superior to the lateral border of rib 1 and clavicle

Axillary Artery

Artery that runs from lateral border of the first rib to the inferior border of Teres Major Muscle

Pectoralis Minor

Ribs 3-5

Origin of Pectoralis Minor

Coracoid Process

Insertion of Pectoralis Minor

stabilizes the Scapula by depressing and protracting it

Action of Pectoralis Minor

Medial to Pectoralis Minor Muscle

Segment 1 of Axillary Artery

deep to borders of Pectoralis Minor Muscle

Segment 2 of Axillary Artery

Lateral to Pectoralis Minor Muscle

Segment 3 of Axillary Artery

Superior Thoracic Artery

Segment 1 branches that comes off Axillary Artery

Thoracoacromial and Lateral Thoracic Artery

Segment 2 branches that comes off Axillary Artery

Posterior Circumflex Humeral, Subscapular, Anterior Circumflex Humeral Artery

Segment 3 branches that comes off Axillary Artery

Circumflex Scapular Artery

Blood supply that runs through the Triangular Space

Posterior Circumflex Humeral Artery

Blood supply that runs through the Quadrangular Space

Cephalic Vein

Basilic Vein

Superior Trunk

C5-C6 Roots merge to _______

Middle Trunk

C7 Root merges to ___________

Inferior Trunk

C8-T1 Roots merge to ___________

Anterior and posterior divisions

Trunks merge into the _______

Lateral Cord

Combined from the anterior divisions of superior and middle trunks

Posterior Cord

Combined from all three posterior divisions

Medial Cord

Combined from the Anterior Division of the Inferior Trunk

Medial and Lateral Root

Combine from the medial and lateral cords into the median branch

Median Nerve

Combined from the Lateral and Medial Cords/Roots

Musculocutaneous Nerve

Forms from the lateral cord and supplies anterior arm muscles

Axillary nerve

Forms from the posterior cord and supplies deltoid

Radial nerve

Forms from the posterior cord and supplies the posterior arm and forearm

Median nerve

Forms from the lateral and medial cords/roots supplies the anterior forearm

Ulnar Nerve

Forms from the medial cord and supplies the intrinsic hand