Muscles Of The Shoulder Joint

Front 1

Glenohumeral Joint

What type of Joint?

Back 1

Ball and Socket Joint

Front 2

Ligaments

Back 2

Weakest Ligaments in body. Tendons of the shoulder muscle will function in a ligamentous role.

Front 3

What Type of Movements of the Shoulder Joint?

Back 3

Flexion
Extension
Abduction ( Up to 90 degrees)
Adduction
Medial Rotation
Lateral Rotation

Front 4

What are the Rotator Cuff Muscles.
S.
I.
T.
S.

Back 4

Supraspinatous
Infraspinatous
Teres Minor
Subscapularis

Front 5

What are the common functions, attachments and actions?

Back 5

Functions - They form a cuff that anchors the head of the humerus to the glenoid cavity of the scapula.

Attachments - Greater Tubercle of the Humerus. 3 of the 4 muscles attach from there. Subscapularis is the only one that attaches to the Lesser Tubercle of Humerus

Actions - Stabilization of the glenohumerus joint

Front 6

Supraspinatous Muscle
Origin / Insertion
Function
Structure/Relationship

Back 6

Origin - Supraspinous Fossa
Insertion - Greater Tubercle of Humerus

Function - Abduction, the first 5 to 10 degrees of abduction

S/R - Deep to Trapezius, one of 2 abductors of shoulder. Fills the Supraspinous fossa, passes inferior to the acromion of Scapula

Front 7

Infraspinatus Muscle
Origin / Insertion
Function
Structure/Relationship

Back 7

Origin - Infraspinous Fossa
Insertion - Greater Tubercle of Humerus

Function - Lateral Rotation of Shoulder

S/R - Deep to Deltoid, fills infraspinous fossa

Front 8

Teres Minor
Origin / Insertion
Function
Structure/Relationship

Back 8

Origin - Lateral Margin of Scapula
Insertion - Greater Tubercle of Humerus

Function - Lateral Rotation of Shoulder

S/R - Deep to deltoid, superior to Teres Major

Front 9

Subscapularis
Origin / Insertion
Function
Structure/Relationship

Back 9

Origin - Subscapular fossa
Insertion - Lesser Tubercle of Humerus

Function - Medial Rotation of Shoulder

S/R - Anterior to Scapula, Found between Scapula and Serratis Anterior. Only rotator cuff muscle that attaches to lesser tubercle.
Forms posterior wall of axilla (armpit)

Front 10

Shoulder Cap Muscle
What muscle sits over the shoulder muscles?

Back 10

Deltoid

Front 11

Deltoid
Origin
Insertion
Function
Structure and Relationships

Back 11

Origin - lateral 3rd of clavicle, acromion, spine of scapula
Insertion - Deltoid Tuberosity of Humerus

Function - Flexion, Medial Rotation, Lateral Rotation, Abduction.

S/R - Does everything but ADDUCTION. 1 of 2 Abductors of shoulder. 3 heads: anterio, lateral and posterior.

Front 12

Intertubercular Groove Muscles
"2 Majors and a Little Miss"
Name the muscles?

Back 12

Pectoralis Major
Teres Major
Latissimus Dorsi

Front 13

Pectoralis Major
Origin
Insertion
Function
Structure and Relationships

Back 13

Origin - Anterior surface of clavicle, anterior surface of sternum.
Insertion - Intertubercular Groove of Humerus

Function - Adduction, medial rotation, Flexion

S/R - Most superficial muscle of chest and creates anterior wall to axilla.

Front 14

Teres Major
Origin
Insertion
Function
Structure and Relationships

Back 14

Origin - Inferior angle of the scapula
Insertion - Intertubercular Groove of Humerus

Function - adduction, medial rotation, extension of flexed shoulder

S/R - Inferior to Teres Minor, forms the inferior border to the posterior wall of the axilla.

Front 15

Latissimus Dorsi
Origin
Insertion
Function
Structure and Relationships

Back 15

Origin - Spinous processes of T7 to L5, Iiliac Crest, Sacral Vertebrae
Insertion - Intertubercular Grrove

Function - Adduction, Medial Rotation, Extension of Flexed shoulder

S/R - Deep to Trapezius, Broadest muscle of the back

Front 16

Intertubercular Groove Muscles
Pectoralis Major
Teres Major
Latissimus Dorsi

Common attachments, actions?

Back 16

Attachments - Insertion onto the intertubercular groove muscles.

Actions - Powerful abductors and medial rotators of humerus.