Posterior Axio-Appendicular (Extrinsic Shoulder) Muscles

Question 1

Trapezius

Answer 1

SUPERFICIAL
Attachments:

Superior/Proximal: External Occipital Protuberance & Nuchal Line & Spinous Processes C7-T12
Inferior/Distal: Lateral Clavicle & Acromion & Spine of Scapula

Action:

Descending Fibres - Elevate Scapulae, Maintain against Gravity
Ascending Fibres - Depresses Scapulae
Together - Rotate Glenoid Cavity Superiorly
Transverse Fibres - Retract Scapluae & With Fixed Shoulders can Extend Neck (Bilateral) or Laterally Flex (Unilateral)
Function: fixes scapula on

Question 2

Latissimus Dorsi

Answer 2

SUPERFICIAL
Attachments:

Superior/Proximal: Spinous Processes T6-T12 & Thoracolumbar Fascia & Iliac Crest
Inferior/Distal: Floor of Intertubercular Sulcus of Humerus

Action:

Extends and Adducts and Medially Rotates Humerus & Raises Arm to Body when Climbing

Question 3

Levator Scapulae

Answer 3

DEEP
Attachments:

Superior/Proximal: Transvere Processes C2-C6
Inferior/Distal: Superior Medial Border of Scapula

Action:

Downward Rotation of Scapula and Tilts its Glenoid Cavity Inferiorly by Rotation of Scapula

Question 4

Rhomboid Minor

Answer 4

DEEP
Attachments:

Superior/Proximal: Nuchal Ligament Spinous Processes C7-T1
Inferior/Distal: Medial Scapula Spine

Action:

Retracts Scapula and Rotates its Glenoid Cavity Inferiorly & Fixes Scapula to Thoracic Wall

Question 5

Rhomboid Major

Answer 5

DEEP
Attachments:

Superior/Proximal: Spinous Processes T2-T5
Inferior/Distal: Medial Border of SCapula down To Inferior Angle

Action:

Retracts Scapula and Rotates its Glenoid Cavity Inferiorly & Fixes Scapula to Thoracic Wall