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Flashcards in Scapular Region Deck (16):
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What muscle inserts on Superior Angle of Scapula

Levator Scapulae

1

Ligaments of Glenohumeral joint

Coracohumeral- greater tubercle to supraglenoid tubercle above glenoid process
Superior GH, Middle GH, Inferior GH- formulates a Z pattern. prevent anterior displacement of humerus
Transverse humeral- covers tendon for long head of biceps brachii
Coracoacromial- connects coracoid and acromion process. Forms coraco-acromial arch. Strong joint superiorly
Acromioclavicular ligament-
Coracoclavicular ligament-
Superior transverse scapular ligament-

2

Acromioclavicular Joint

Plane-type synovial joint, connects the clavicle and the scapula.

3

Sternoclavicular

Saddle-type synovial joint, functions as a ball-and-socket to accommodate movements of the scapula. Connects the scapula to the thorax.

4

Types of Shoulder Separation

I) Torn AC ligament
II) Torn AC ligament with separation
III) Torn AC, trapezoid and conoid ligaments with separation

5

Serratus Anterior: Origin, Insertion, Action, Innervation

Origin: Lateral parts of the 1st-8th ribs
Insertion: Anterior surface of medial border of scapula
Action: 1. Protracts scapula 2. Holds scapula against the thoracic wall 3. Superior rotation of the scapula
Innervation: Long thoracic nerve

6

Scapulohumeral Muscles

- Deltoid
- Supraspinatus
- Infraspinatus
- Teres minor
- Teres major

7

Deltoid: Insertion, Innervation

Insertion: Deltoid tuberosity
Innervation: Axillary nerve

Deltoid muscle has 3 parts (Anterior, Middle and Posterior)

8

Deltoid: Action

1. All three simultaneously: abduct the humerus at the glenohumeral joint after the first 150 to the horizontal. Also functions to stabilize the shoulder
2. Anterior: flexion and medial rotation of the humerus at the glenohumeral joint
3. Posterior: extension and lateral rotation of the humerus at the glenohumeral joint

9

Teres major: Origin, Insertion, Innervation, Action

Origin: Inferior angle of scapula (posterior surface)
Insertion: Medial lip of intertubercular sulcus
Innervation: Lower subscapular nerve
Action: Adducts and medially rotates the humerus at the glenohumeral joint

10

Rotator Cuff Musscles

- Surround Glenohumeral Joint
- Supraspinatus
- Infraspinatus
- Subscapularis
- Teres Minor

11

Supraspinatus: Origin, Insertion, Innervation, Action

Origin: Supraspinous fossa
Insertion: Greater tubercle
Innervation: Suprascapular nerve
Action: 1.Abduct the arm for the first 15 degrees 2.Tonic contraction stabilizes the glenohumeral joint

12

Infraspinatus: Origin, Insertion, Innervation, Action

Origin: Infraspinous fossa
Insertion: Greater tubercle
Innervation: Suprascapular nerve
Action: 1.Tonic contraction stabilizes the glenohumeral joint. 2.Laterally rotates arm

13

Teres Minor: Origin, Insertion, Innervation, Action

Origin: Middle part of lateral border of scapula
Insertion: Greater tubercle
Innervation: Axillary nerve
Action: 1.Tonic contraction stabilizes the glenohumeral joint. 2.Laterally rotates arm

14

Subscapularis

Origin:Subscapular fossa
Insertion: Lesser tubercle
Innervation: Upper subscapular nerve and lower subscapular nerve
Action: 1.Tonic contraction stabilizes the glenohumeral joint. 2.Medially rotates arm

15

Subclavian artery

The subclavian artery becomes the axillary artery at the lateral border of 1st rib.
- The axillary artery becomes the brachial artery at the inferior border of the teres major.