Anatomy: Pectoral Region Muscles
3 Different types of Ribs
1. True Ribs (1-8)- Articulate Directly with Sternum 2. False Ribs (9-12)- Articulate only with costal cartilage of above ribs. 3. Floating ribs (11-12)- Articulate with vertebrae only
What is found in the triangle?
ACDP Acromial branch Clavicular branch Deltoid branch Pectoral branch
pectoralis minor
Attaches Scapula to Axial skeleton
Promixal Artery to ThoracoAcromial Trunk
Axillary Artery
Why is the Medial Pectoral Nerve called medial?
Because it is medial to the lateral vein in their origin at the Brachial Plexus.
serratus anterior
Boxer's Muscle
Vein that superficially separates the Deltoid and Pectoralis Major?
Cephalic Vein
Anatomy of Proximal Humerus
Humeral Head intertubercular groove Greater & Lesser Tuberosity Surgical Neck Anatomical Head Deltoid Tuberosity
subclavius insertion
Inferior surface of clavicle (subclavian groove)
pectoralis minor origin
Ribs 3-5
subclavius
Round muscle hidden/protected by clavicle
Clavicle
Sternal end Acromial end
What is proximal to the Axillary Artery?
Subclavian Artery Subclavian => Axillary => Brachial Artery
pectoralis minor insertion
coracoid process of scapula
pectoralis major insertion
lateral lip of intertubercular groove of humerus
serratus anterior innervation
long thoracic nerve (C5-7)
pectoralis minor innervation
medial pectoral nerve C8-T1 pierces and innervates
pectoralis major origin
medial third of clavicle (clavicular head) sternum ribs 2-6 (sternocostal head) Costal/Abdominal Head
subclavius innervation
nerve to the subclavius (C 5-6)
serratus anterior function
protracts scapula and holds it against thoracic wall inferior fibers rotate the scapula and move the glenoid fossa superiorly (upward scapula rotation) when abducting arm above shoulder
serratus anterior origin
ribs 1-8
pectoralis minor function
•Scapular depression (Pulls tip of Scapula down) •Scapular protraction (with other muscles)
What does ACDP attach to promixaly?
ThoracoAcromial Trunk/Artery (Yellow)
pectoralis major innervation
Clavicular head - lateral pectoral nerve C5-7 Sternocostal head - medial pectoral nerve C8-T1
Important Aspects of Manubrium
Jugular Notch Clavicular Notch Sternal Angle- Angle of Louis
subclavius origin
Junction of 1st rib and costal cartilage
3 Parts of the Sternum
Manubrium Sternum Body Xyphoid Proces
serratus anterior insertion
anterior surface of medial border of scapula
Anatomical Landmark of Pectoral Deltoid Region
clavipectoral triangle or Deltopectoral Triangle
subclavius function
•Depresses the clavicle •Protracts the clavicle •Shunts clavicle towards axial skeleton with powerful movements of the UE •Throwing •Punching
Proximal Humerus
•Greater tuberosity •Lesser tuberosity •Intertubercular (bicipital) groove •Lateral lip: attachment site of pectoralis major
pectoralis major function
•Horizontal adduction of arm •Flexion of arm •Internal rotation of arm
