Scapulohumeral (Intrinsic Back) Muscles

Question 1

Deltoid

Answer 1

Attachments:

Superior/Proximal: Lateral Clavicle & Acromion & Spine of Scapula
Inferior/Distal: Deltoid Tuberosity of Humerous

Action:

Clavicular Part: Flexes and Medially Rotates Arm
Acromion Part: Abducts Arm
Spinal Part: Extends and Laterally Rotates Arm
Function: stabilises glenohumeral joint

Question 2

Supraspinatus

Answer 2

Attachments:

Superior/Proximal: Supraspinous Fossa of Scapula
Inferior/Distal: Superior Greater Tubercle of Humerous

Action:

Initiates and Assists Deltoid in Abduction of Arm & Acts with Rotator Cuff Muscles

Question 3

Infraspinatus

Answer 3

Attachments:

Superior/Proximal: Infraspinatus Fossa of Scapula
Inferior/Distal: Middle Greater Tubercle of Humerous

Action:

Laterally Rotates Arm & Acts with Rotator Cuff Muscles

Question 4

Teres Minor

Answer 4

Attachments:

Superior/Proximal: Middle, Lateral Border of Scapula
Inferior/Distal: Inferior Greater Tubercle of Humerous

Action:

Laterally Rotates Arm & Acts with Rotator Cuff Muscles

Question 5

Teres Major

Answer 5

Attachments:

Superior/Proximal: Posterior Inferior Angle of Scapula
Inferior/Distal: Medial Lip of Intertubercular Sulcus of Humerous

Action:

Adducts and Medially Rotates Arm

Question 6

Subscapularis

Answer 6

Attachments:

Superior/Proximal: Subscapular Fossa
Inferior/Distal: Lesser Tubercle of Humerous

Action:

Medially Rotates Arm, and Acts with Rotator Cuff Muscle