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Scapular Region. Objectives. Know the principal muscles of the scapular and scapulo-humeral regions . Understand the mechanism of scapular rotation in relation with shoulder movements. . Surface Anatomy. Spine. Acromion (of scapula. Trapezius muscle. Infraspinatus muscle. Triangle of

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Objectives
Objectives

  • Know the principal muscles of the scapular and scapulo-humeral regions.

  • Understand the mechanism of scapular rotation in relation with shoulder movements.


Surface anatomy
Surface Anatomy

  • Spine

Acromion (of scapula

Trapezius muscle

Infraspinatus

muscle

Triangle of

ascultation

Teres minor

muscle

Teres major

muscle


Anterior

Scapula.

-angles, borders

-glenoid cavity,

-acromion,

-coracoid process,

-Subscapular fossa

Humerus.

-Head,

-Surgical neck

-Anatomical neck

-Greater tubercle

-Lesser tubercle

-Intertubercular

(bicipital) groove

acromion

anatomical neck

coracoid process

Lesser tubercule

Greater tubercule

surgical neck

bicipital groove

glenoid cavity


Posterior

Clavicle.

Acromioclavicular joint

Scapula.

- Spine

- Acromion

- Supraspinous fossa

- Infraspinous fossa

Humerus.

- Head

- Anatomical neck,

- Surgical neck,

- Deltoid tuberosity

- Spiral (radial) groove.

Acromioclavicular joint

Supraspinous Fossa

anatomical neck

surgical neck

Spine

Deltoid Tuberosity

Infraspinous Fossa

Radial Groove


Scapula rotates when we move

our arms to allow more range of motion at the shoulder joint


Complete abduction at the shoulder joint requires

superior rotation of the scapula so that the glenoid

fossa faces superiorly.

Glenoid fossa


Deltoid
Deltoid

  • Clavicular origin, acromial, and scapular origins, attach all to deltoid tuberosity

  • Anterior fibers flexes

  • Posterior fibers extends and laterally rotates

  • Middle fibers abducts the arm

  • Innervation C5,6 Axillary nerve

Delta= Triangle

Deltoid=triangular in shape

Principal abductors= Deltoid, supraspinatus


Subdeltoid / Subacromial bursa.

Deltoid

Sub Acromial Bursa

Subdeltoid Bursa

Subscapularis

Bursa: a closed sac or envelope, lined with synovium

and containing fluid, usually in areas subject to friction.


Rotator cuff muscles stabilize the shoulder joint.

Supraspinatus, Infraspinatus,

Subscapularis, Teres minor

Subscapularis

Subscapularis

Anterior view

Supraspinatus

Infraspinatus

Superior view

Teres Minor

Posterior view


Rotator cuff muscles
Rotator Cuff Muscles

Because the scapula is triangular deep bone, padded

with thick muscles, injuries leading to scapular fractures

Will be so severe , and most commonly we will have lots of multiple, or serious other fractures


Transverse scapular ligament
Transverse scapular ligament

  • Runs between Subscapular nerve (C5,6) and artery, which supply Supraspinatus and Infraspinatus muscles

  • Artery above, nerve below


Serratus anterior
Serratus Anterior

Subscapularis

Winged Scapula:

(long thoracic nerve)

"big swing muscle" or "boxer's muscle”

Antagonist of Rhomboids

Accessory muscle of respiration


Posterior view:

- Trapezius

- Latissimus Dorsi

- Deltoid

Trapezius

Rhomboids

Deltoid

Rhomboids:

- minor and major

- retract / inferior rotate

scapula

Teres Major

Latissimus

Dorsi

Teres major:

- inserts near latissimus dorsi

- adduct / medially rotate arm


Rhomboids retract, so injury to the dorsal scapular nerve will make the scapula further away from the midline on the affected side

Posterior scapula



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