clavicle and muscles

Bones forming the pectoral girdle

Clavicle and scapula.

Superficial muscles over shoulder

Trapezius and deltoid muscles.

Only bony attachment between trunk and upper limb

Clavicle.

Shape of the clavicle along its length

Gentle S-shaped contour.

Forward-facing convex part of clavicle

Medial part.

Forward-facing concave part of clavicle

Lateral part.

Shape of the acromial end of the clavicle

Flat.

Shape of the sternal end of the clavicle

Quadrangular.

Acromial end articulation

Acromion of the scapula.

Sternal end articulation with primary structure

Manubrium of the sternum.

Sternal end articulation with lesser structure

First costal cartilage.

Tubercle on inferior surface of clavicle

Conoid tubercle.

Ligament attaching to the conoid tubercle

Coracoclavicular ligament.

Smoother surface of the clavicle

Superior surface.

Largest muscle of the anterior thorax wall

Pectoralis major muscle.

Number of heads of pectoralis major

Two heads.

Origin of the clavicular head of pectoralis major

Anterior surface of medial half of clavicle.

Origin of the sternocostal head of pectoralis major

Anterior surface of sternum; first seven costal cartilages; sternal end of sixth rib; aponeurosis of external oblique.

Insertion of the pectoralis major muscle

Lateral lip of intertubercular sulcus of humerus.

Nerves innervating pectoralis major muscle

Medial and lateral pectoral nerves.

Nerve supply for clavicular head of pectoralis major

C5, C6.

Nerve supply for sternocostal head of pectoralis major

C6, C7, C8, T1.

Functions of pectoralis major muscle

Flexion, adduction, and medial rotation of arm at glenohumeral joint.

Function of the clavicular head of pectoralis major

Flexion of extended arm.

Function of the sternocostal head of pectoralis major

Extension of flexed arm.

Muscle lying deep to pectoralis major

Subclavius muscle.

Structures subclavius muscle passes between

Between the clavicle and rib I.

Origin of subclavius muscle

Rib I at junction between the rib and its costal cartilage.

Insertion of subclavius muscle

subclavius Groove on the inferior surface

Function of subclavius muscle

May pull shoulder down by depressing clavicle and stabilize sternoclavicular joint by pulling clavicle medially.

Nerve innervating subclavius muscle

Small branch from the superior trunk of the brachial plexus.

Shape of pectoralis minor muscle

Small triangular-shaped.

Muscle lying deep to pectoralis major

Pectoralis minor muscle.

Pectoralis minor's path to the scapula

From thoracic wall to the coracoid process of the scapula.

Origin of pectoralis minor muscle

Anterior surfaces and upper margins of ribs III to V and intercostal spaces.

Insertion of pectoralis minor muscle

Medial and upper aspects of the coracoid process.

Function of pectoralis minor muscle

Protracts the scapula and depresses the lateral angle of the scapula.

Nerve innervating pectoralis minor muscle

Medial pectoral nerve.

Connection of the clavipectoral fascia

Connects clavicle to the floor of the axilla.

Muscles enclosed by the clavipectoral fascia

Subclavius and pectoralis minor muscles.

Vein passing through clavipectoral fascia

Cephalic vein.

Artery passing through clavipectoral fascia

Thoraco-acromial artery.

Nerve passing through clavipectoral fascia

Lateral pectoral nerve.

Artery leaving axilla via clavipectoral fascia

Lateral thoracic artery.

Nerve penetrating pectoralis minor muscle from axilla

Medial pectoral nerve.

Muscles supplied by medial pectoral nerve

Pectoralis minor and pectoralis major.