Scapular Muscles/Rotator Cuff Muscles Flashcards
Rotator Cuff
-Supraspinatus
-Infraspinatus
-Teres Minor
-Subscappularis
-Deltoids
-Teres Major
Deltoid (Attachments)
-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
Deltoid (Action)
-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
What are the rotator cuff muscles?
Supraspinatus, Infraspinatus, Teres Minor, and Subscapularis
What is the function of the rotator cuff muscles?
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
Head of humerus ca be separated from the ___________________ by _______ when the muscles are cut
Glenoid Fossa, 2.5cm
Do Non-contractile elements (capsule, ligaments, etc.) stabilize the joint?
Non-contractile elements (capsule, ligaments, etc.) don’t stabilize the joint, the muscles do
Supraspinatus (Attachments)
-Medial Attachment: Supraspinous Fossa
-Lateral Attachment: Superior facet of the greater tubercle of the humerus (also the G-H joint capsule)
Supraspinatus (Action)
-Action: Abduction/Scaption
-Action: Stabilizes the G-H joint by ‘tucking’ the head of the humerus up into the Glenoid Fossa
Infraspinatus (Attachment)
-Medial Attachment: Infraspinous Fossa
-Lateral Attachment: Middle facet of the greater tubercle of the humerus (also the G-H joint capsule)
Infraspinatus (Action)
-Action: G-H External Rotation
Teres Minor (Attachments)
-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)
Teres Minor (Action)
-Action: G-H External Rotation
Subscapularis (Attachments)
-Medial Attachment: Subscapular Fossa
-Lateral Attachment: Lesser tubercle of the humerus (also the G-H joint capsule)
Subscapularis (Attachments)
-Action: G-H internal rotation
Teres Major is part of the rotator cuff muscles?
Teres Major is NOT one of the rotator cuff muscles
Teres Major (Attachments)
-Medial Attachment: Posterior surface of the inferior angle of the scapula
-Lateral Attachment: Medial lip of the Bicipital Groove
Teres Major (Action)
-Action: G-H Internal Rotation
-Action: G-H Extension
-Action: G-H Adduction
Radius
-Lateral bone in forearm
-Has slight bowing and thickens as you travel distally
-Latin: Resembles spoke of a wheel
Radius Landmarks
-Head
-Neck
-Radial Tuberosity
-Interosseous Border
-Styloid Process
-Dorsal Tubercle (a.k.a. Lister’s Tubercle)
-Ulnar notch (of the radius)
Ulnar notch is on the _______________.
Radius
Radial notch is on the ________________.
Ulna
Ulna
-Medial bone in the forearm
-Latin: elbow
Ulna Landmarks
-Olecranon
-Trochlear Notch
-Coronoid Process
-Radial Notch
-Ulnar Tuberosity
-Interosseous Border
-Styloid Process
-Head
-Supinator Crest
