Muscles of the Shoulder Joint

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What is the weakest ligamentous joint in the body?

Shoulder
What kind of joint is the shoulder?

Ball and socket
The shoulder joint is made up of the articulations between the ____________ and the ____________.
- head of the humerus
- glenoid cavity of the scapula
Origin of supraspinatus?

supraspinous fossa
Insertion of supraspinatus?

greater tubercle of the humerus (superior 1/3)
Function of supraspinatus?
- Abduction of shoulder
- Stabilize shoulder joint
What muscle performs the first 10^o of abduction?

supraspinatus
What are the two shoulder abductors?
- supraspinatus
- deltoid
Supraspinatus is _________ to trapezius.

deep
Origin of infraspinatus?

infraspinous fossa
Insertion of infraspinatus?

greater tubercle of humerus (middle 1/3)
Function of infraspinatus?
- Lateral rotation of shoulder
- Stabilize shoulder joint
What are the two lateral rotators of the shoulder?
- infraspinatus
- teres minor
- and the deltoid provides weak lateral rotation
Origin of teres minor?

upper lateral margin of scapula
Insertion of teres minor?

greater tubercle of humerus (lower 1/3)
Function of teres minor?
- Lateral rotation of shoulder
- Stabilize shoulder joint
Teres minor is ________ to teres major.

superior
Teres minor is _________ than teres major.

smaller
Origin of subscapularis?

subscapular fossa
Insertion of subscapularis?

lesser tubercle of humerus
Function of subscapularis?
- Medial rotation of shoulder
- Stabilize shoulder joint
The ______________ muscle is sandwiched between the scapula and serratus anterior.

subscapularis
What is the only rotator cuff muscle to attach to the lesser tubercle of the humerus?

subscapularis
What are the 4 rotator cuff muscles?
- Supraspinatus
- Infraspinatus
- Teres minor
- Subscapularis
What is the only muscle in the rotator cuff group that performs medial rotation?

subscapularis
All 4 of the rotator cuff muscles __________ on the scapula and _______ on the humerus.
- originate
- insert
Which muscle group performs the ligamentous role at the shoulder joint?
rotator cuff group
- 1. supraspinatus
- 2. infraspinatus
- 3. teres minor
- 4. subscapularis
Which muscle group anchors the head of the humerus to the glenoid cavity of the scapula?
rotator cuff group
- 1. supraspinatus
- 2. infraspinatus
- 3. teres minor
- 4. subscapularis
Which of the rotator cuff muscles perform medial rotation?

subscapularis
Which of the rotator cuff muscles perform lateral rotation?
- infraspinatus
- teres minor
Which of the rotator cuff muscles perform abduction of the shoulder joint?

supraspinatus
What muscle(s) make up the shoulder cap?

deltoid
Origin of deltoid?
- Lateral 1/3 of clavicle
- acromion
- spine of the scapula
Insertion of deltoid?

deltoid tuberosity
Function of deltoid?
- Shoulder flexion
- Shoulder extension
- Shoulder abduction
- Weak medial rotation
- Weak lateral rotation
The deltoid is found _________ to the rotator cuff group.

Superficial
The origin of the _________ is the same as the insertion of the ___________.
- deltoid
- trapezius
The __________ muscle can only perform abduction after the first 10^o.

deltoid
What are the 3 intertubercular groove muscles?
- Pectoralis major
- Teres major
- Latissimus dorsi
Origin of pectoralis major?
- Medial half of clavicle
- Sternum
- Costal cartilages of ribs 1-9 (by sternum)
Insertion of pectoralis major?

intertubercular groove
Function of pectoralis major?
- Medial rotation of shoulder
- Shoulder adduction
- Flexion of an extended shoulder
Pectoralis major is _________ to pectoralis minor.

superficial
Pectoralis major forms the ________ wall of the axilla.

anterior
Origin of teres major?
- Inferior angle of the scapula
- Lateral margin of scapula
Insertion of teres major?

intertubercular groove
Function of teres major?
- Medial rotation of the shoulder
- Shoulder adduction
- Extension of a flexed shoulder
Teres major is found ___________ to teres minor.

inferior
Teres major forms the __________ (_______) border of the _________ (_______) wall of the axilla
- inferior
- bottom
- posterior
- back
Origin of latissimus dorsi?
- Spinous processes of T₇-sacral processes
- posterior iliac crest
Insertion of latissimus dorsi?

intertubercular groove
Function of latissimus dorsi?
- Medial rotation of the shoulder
- Shoulder adduction
- Extension of a flexed shoulder
Which muscle creates the aponeurotic nature over the spine?

latissimus dorsi
What is the most superficial muscle in the low back?

latissimus dorsi
Only the trapezius is more superficial than _____________.

latissimus dorsi
What muscle is also known as the swimmer muscle?

latissimus dorsi
All the intertubercular groove muscles __________ on the intertubercular groove.

Insert
The intertubercular groove muscles are powerful ____________ and ____________ of the shoulder joint
- Adductors
- Medial rotators
Which muscles cause flexion of the shoulder joint?
- Deltoid
- Pectoralis Major (extended)
Which muscles cause extension of the shoulder joint?
- Deltoid
- Teres major (flexed)
- Latissimus dorsi (flexed)
Which muscles cause abduction of the shoulder joint?
- Supraspinatus
- Deltoid
Which muscles cause adduction of the shoulder joint?
- Pectoralis Major
- Teres major
- Latissimus dorsi
Which muscles cause medial rotation of the shoulder joint?
- Subscapularis
- Deltoid
- Pectoralis major
- Teres major
- Latissimus dorsi
Which muscles cause lateral rotation of the shoulder joint?
- Infraspinatus
- Teres minor
- Deltoid

Author

mandelyn

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Card Set

Muscles of the Shoulder Joint

Description

Muscles of the shoulder joint

Updated

2013-10-21T06:14:31Z

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