Scapular Muscles/Rotator Cuff Muscles

Question 1

Rotator Cuff

Answer 1

-Supraspinatus
-Infraspinatus
-Teres Minor
-Subscappularis
-Deltoids
-Teres Major

Question 2

Deltoid (Attachments)

Answer 2

-Anterior, Middle, Posterior Heads
-Medial Attachment (Anterior): Anterior Lateral 1/3rd of the Clavicle
-Medial Attachment (Middle): Lateral Acromion
-Medial: attachment (Posterior): Spine of the scapula
-Lateral Attachment: Deltoid Tuberosity

Question 3

Deltoid (Action)

Answer 3

-Action (all): G-H Abduction
-Action (Anterior Head): G-H Medial Rotation, Flexion, Horizontal Adduction
-Action (Posterior Head): G-H Lateral Rotation, Extension, Horizontal Abduction

Question 4

What are the rotator cuff muscles?

Answer 4

Supraspinatus, Infraspinatus, Teres Minor, and Subscapularis

Question 5

What is the function of the rotator cuff muscles?

Answer 5

Support/Stabilize the G-H Joint and Help to control it’s movements

*Head of humerus ca be separated from the Glenoid Fossa by 2.5cm when the muscles are cut - this means the non-contractile elements (capsule, ligaments, etc.) don’t stabilize the joint, the muscles do

Question 6

Head of humerus ca be separated from the ___________________ by _______ when the muscles are cut

Answer 6

Glenoid Fossa, 2.5cm

Question 7

Do Non-contractile elements (capsule, ligaments, etc.) stabilize the joint?

Answer 7

Non-contractile elements (capsule, ligaments, etc.) don’t stabilize the joint, the muscles do

Question 8

Supraspinatus (Attachments)

Answer 8

-Medial Attachment: Supraspinous Fossa
-Lateral Attachment: Superior facet of the greater tubercle of the humerus (also the G-H joint capsule)

Question 9

Supraspinatus (Action)

Answer 9

-Action: Abduction/Scaption
-Action: Stabilizes the G-H joint by ‘tucking’ the head of the humerus up into the Glenoid Fossa

Question 10

Infraspinatus (Attachment)

Answer 10

-Medial Attachment: Infraspinous Fossa
-Lateral Attachment: Middle facet of the greater tubercle of the humerus (also the G-H joint capsule)

Question 11

Infraspinatus (Action)

Answer 11

-Action: G-H External Rotation

Question 12

Teres Minor (Attachments)

Answer 12

-Medial Attachment: Lateral middle border of the scapula (between triceps and teres major)
-Lateral Attachment: Inferior facet of the greater tubercle of the humerus (also the G-H joint capsule)

Question 13

Teres Minor (Action)

Answer 13

-Action: G-H External Rotation

Question 14

Subscapularis (Attachments)

Answer 14

-Medial Attachment: Subscapular Fossa
-Lateral Attachment: Lesser tubercle of the humerus (also the G-H joint capsule)

Question 15

Subscapularis (Attachments)

Answer 15

-Action: G-H internal rotation

Question 16

Teres Major is part of the rotator cuff muscles?

Answer 16

Teres Major is NOT one of the rotator cuff muscles

Question 17

Teres Major (Attachments)

Answer 17

-Medial Attachment: Posterior surface of the inferior angle of the scapula
-Lateral Attachment: Medial lip of the Bicipital Groove

Question 18

Teres Major (Action)

Answer 18

-Action: G-H Internal Rotation
-Action: G-H Extension
-Action: G-H Adduction

Question 19

Radius

Answer 19

-Lateral bone in forearm
-Has slight bowing and thickens as you travel distally
-Latin: Resembles spoke of a wheel

Question 20

Radius Landmarks

Answer 20

-Head
-Neck
-Radial Tuberosity
-Interosseous Border
-Styloid Process
-Dorsal Tubercle (a.k.a. Lister’s Tubercle)
-Ulnar notch (of the radius)

Question 21

Ulnar notch is on the _______________.

Answer 21

Radius

Question 22

Radial notch is on the ________________.

Answer 22

Ulna

Question 23

Ulna

Answer 23

-Medial bone in the forearm
-Latin: elbow

Question 24

Ulna Landmarks

Answer 24

-Olecranon
-Trochlear Notch
-Coronoid Process
-Radial Notch
-Ulnar Tuberosity
-Interosseous Border
-Styloid Process
-Head
-Supinator Crest