Anatomy of the Shoulder

Anatomy of the Shoulder

Major Bones of the Shoulder

Clavicle

Scapula

Humerus

Sternum

Clavicle

Irregular shaped bone

Very commonly FX

Two joints:

1. Acromioclavicular Joint (AC)

2. Sternoclavicular Joint (SC)

Scapula

Triangular shaped bone

Acts as an articulating surface

Humerus

Head is spherical shape

Important land marks:

1. Greater Tubercle

2. Lesser Tubercle

Sternum

Has 3 parts:

1. Manubrium

2. Body

2. Xiphoid Process

Boney Landmarks

Acromion

Coracoid Process

Humeral Head

Greater Tubercle

Lesser Tubercle

Acromion

Coracoid Process

Humeral Head

Greater Tubercle

Lesser Tubercle

Multiple Choice

Identify the Structure

• Humerus

• Acromion

• Sternum

• Clavicle

Multiple Choice

Identify the Structure

• Coracoid

• Acromion

• Clavicle

• Scapula

Multiple Choice

Identify the Structure

• Acromion

• Lesser Tubercle

• Greater Tubercle

• Coracoid

Multiple Choice

Identify the Structure

• Coracoid

• Humeral Head

• Clavicle

• Acromion

Multiple Choice

Identify the Structure

• Greater Tubercle

• Coracoid

• Lesser Tubercle

• Humeral Head

Soft Tissue

Anterior

Deltoid

Has a posterior, lateral, and anterior head

Origin:

1. Lateral 1/3 of Clavicle

2. Spine of Scapula

Insertion: Deltoid tuberosity of humerus

*Main function: shoulder abduction

Pectoralis Major

Attaches to clavicle and sternum to humerus

Origin:

1. Anterior medial 1/2 of clavicle

2. Anterior medial surface of sternum

Insertion: inferior to greater tubercle

*Main function: shoulder adduction

Serratus Anterior

Origin: Ribs 1-9

Insertion: Scapula- anterior surface

*Main function: shoulder protraction

Biceps Brachii

Origin:

1. Scapula

2. Coracoid Process

Insertion: Radial Tuberosity

*Main function: shoulder flexion (weakly)

Sternocleidomastoid

Origin: superior surface of medial 1/3 clavicle

Insertion: mastoid process/occipital bone

*Main function: neck flexion/shoulder shrug

Multiple Choice

Identify the structure

• deltoid

• sternocleidomastoid

• pectoralis major

• serratus anterior

Multiple Choice

Identify the structure.

• Pectoralis Major

• Serratus Anterior

• Deltoid

• Biceps Brachii

Multiple Choice

Identify the structure.

• Deltoid

• Pectoralis Major

• Sternocleidomastoid

• Biceps Brachii

Multiple Choice

Identify the structure.

• Deltoid

• pectoralis major

• Serratus Anterior

• Sternocleidomastoid

Multiple Choice

Identify the structure.

• Biceps Brachii

• Deltoid

• Pectoralis Major

• Serratus Anterior

Soft Tissue

Posterior

Trapezius

Origin:

1. Occipital Bone

2. Vertebrae C1-T3

3. Vertebrae T4-T12

Insertion:

1. lateral 1/3 of clavicle

2. Spine of Scapula

*Main function: shoulder shrug, scapula retraction

Rhomboid

Origin: Vertebrae T2-T5

Insertion: medial border of scapula

*Main function: scapular retraction

Latissimus Dorsi

Origin:

1. Vertebrae T7-T12

2. Crest of Ilium

3. Ribs 9-12

4. Inferior angle of Scapula

Insertion:

Intertubercular sulcus of humerus

*Main function: internal rotation and adduction

Triceps Brachii

Origin:

1. Scapula

2. Posterior surface of humerus

Insertion:

Olecranon Process

*Main Function: Extension and Adduction

Levator Scapulae

Origin: Vertebrae C1-C4

Insertion: medial border of scapula

*Main function: shoulder shrug/ scapula rotation

Multiple Choice

Identify the structure.

• latissimus dorsi

• triceps brachii

• levator scapulae

• trapezius

Multiple Choice

Identify the structure.

• Latissimus dorsi

• Triceps Brachii

• Rhomboid

• Trapezius

Multiple Choice

Identify the structure.

• Rhomboid

• Latissimus Dorsi

• Triceps Brachii

• Levator Scapulae

Multiple Choice

Identify the structure.

• Levator Scapulae

• latissimus dorsi

• triceps brachii

• trapezius

Multiple Choice

Identify the structure.

• trapezius

• levator scapulae

• triceps brachii

• latissimus dorsi