Download MBBS Anatomy PPT 102 Scapular Region Notes

Deltoid

Origin

--- Content provided by FirstRanker.com ---

? Lateral third of clavicle, acromion

process, spine of scapula

Insertion

--- Content provided by FirstRanker.com ---

? Middle of lateral surface of shaft

of humerus

Nerve supply

--- Content provided by FirstRanker.com ---

? Axillary nerve C5, 6

Action

Middle fibers Abducts arm;

--- Content provided by FirstRanker.com ---

anterior fibers flex and medially

rotate arm;

--- Content provided by FirstRanker.com ---

posterior fibers extend and laterally

rotate arm

? Abduction from 15-90 degrees

--- Content provided by FirstRanker.com ---

Structures under cover of Deltoid

BONE- Upper part humerus, coracoid process
,greater tubercle, lesser tubercle Intertuberculus

--- Content provided by FirstRanker.com ---

sulcus

Bursa- Subdeltoid , subaccromial bursa
Muscles ? attached around shoulder joint

--- Content provided by FirstRanker.com ---

vessel- Ant and Post circumflex humeral vessel
Nerves- Axillary


Supraspinatus

--- Content provided by FirstRanker.com ---

Origin
? medial 2/3 of Supraspinous

fossa of scapula

--- Content provided by FirstRanker.com ---

Insertion
? Greater tuberosity of humerus;

capsule of shoulder joint

--- Content provided by FirstRanker.com ---

Nerve supply
? Suprascapular nerve C 5, 6

Action

--- Content provided by FirstRanker.com ---

? Abducts arm and stabilizes

shoulder joint

? Initiation of abduction 0-15

--- Content provided by FirstRanker.com ---

degrees


Infraspinatus

--- Content provided by FirstRanker.com ---

Origin
? Medial 2/3 Infraspinous fossa

of scapula

--- Content provided by FirstRanker.com ---

Insertion
? Greater tuberosity of

humerus; capsule of shoulder

--- Content provided by FirstRanker.com ---

joint

Nerve supply
? Suprascapular nerve C 5, 6

--- Content provided by FirstRanker.com ---

Action
? Laterally rotates arm and

stabilizes shoulder joint

--- Content provided by FirstRanker.com ---

Teres minor

Origin
? Upper two thirds of

--- Content provided by FirstRanker.com ---

lateral border of scapula

Insertion
? Greater tuberosity of

--- Content provided by FirstRanker.com ---

humerus; capsule of

shoulder joint

--- Content provided by FirstRanker.com ---

Nerve supply
? Axillary nerve C5, 6
Action
? Laterally rotates arm and

--- Content provided by FirstRanker.com ---

stabilizes shoulder joint


Teres major

--- Content provided by FirstRanker.com ---

Origin
? Lower third of lateral

border of scapula

--- Content provided by FirstRanker.com ---

Insertion
? Medial lip of bicipital

groove of humerus

--- Content provided by FirstRanker.com ---

Nerve supply
? Lower subscapular nerve

C6, 7

--- Content provided by FirstRanker.com ---

Action
? Medially rotates and

adducts arm and

--- Content provided by FirstRanker.com ---

stabilizes shoulder joint

Subscapularis

Origin

--- Content provided by FirstRanker.com ---

? Medial 2/3 subscapular

fossa

Insertion

--- Content provided by FirstRanker.com ---

? Lesser tubercle of humerus

Nerve supply
? Upper and lower

--- Content provided by FirstRanker.com ---

subscapular nerves C5, 6, 7

Action
? Medially rotates arm and

--- Content provided by FirstRanker.com ---

stabilizes shoulder joint


Rotator Cuff

--- Content provided by FirstRanker.com ---

--- Content provided by FirstRanker.com ---

Arterial Anastomosis Around the

Shoulder Joint

? The extreme mobility of the

--- Content provided by FirstRanker.com ---

shoulder joint may result in

kinking of the axillary artery and

--- Content provided by FirstRanker.com ---

a temporary occlusion of its

lumen

? To compensate for this, an

--- Content provided by FirstRanker.com ---

important arterial anastomosis

exists between the branches of

--- Content provided by FirstRanker.com ---

the subclavian artery and the

axillary artery

? ensuring that an adequate blood

--- Content provided by FirstRanker.com ---

flow takes place into the upper

limb irrespective of the position

--- Content provided by FirstRanker.com ---

of the arm