Shoulder Joint

Question 1

Deltoid Spinal

Answer 1

Deltoid Spinal (Posterior Head)
Origin: Spine of scapula
Insertion: Deltoid tuberosity of
humerus
Actions: * Extension of humerus
* Lateral rotation of humerus
* Abduction of humerus

Question 2

Deltoid Acromial and clavicular

Answer 2

Deltoid Acromial (Lateral Head):
Origin: Acromion
Insertion: Deltoid tuberosity of
humerus
Action: * Abduction of arm at shoulder

Deltoid Clavicular (Anterior) Head:
Origin: Clavicle
Insertion: Deltoid tuberosity of
humerus
Actions: * Flexion of humerus
* Medial rotation of humerus
* Abduction of humerus

Question 3

Pectoralis Major

Answer 3

Origin: * Medial clavicle
* Costal cartilage of ribs 1-6
Insertion: * Bicipital (intertubercular)
groove of humerus
Actions: * Flexion of arm at shoulder * Extension of flexed arm
* Medial rotation of humerus
* Adduction of humerus
* Horizontal flexion of arm

Question 4

Latissimus Dorsi

Answer 4

Latissimus Dorsi
Origin: * Posterior sacrum
* Lumbar vertebrae
* Lower thoracic vertebrae
Insertion: * Bicipital (intertubercular) * groove of humerus
Actions: * Extension of arm at shoulder * Medial rotation of humerus
* Adduction of humerus