Scapula (Shoulder Blade)

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Published: December 2, 2014
Last reviewed: December 9, 2016

What is scapula (the shoulder blade)?

Scapula is the medical term for the shoulder blade.

The shoulder blades are two flat, symmetrical bones on each side of the top of your back [1].

Scapula Function

The shoulder blades attach the upper arm and upper back muscles that raise your arms and shoulders and bend your neck backwards or sideways.

Scapula Location

Shoulder blades lie behind and medially to the shoulders, over the rib cage on each side of the spine; together with the clavicles, they form the shoulder or pectoral girdle. They make joints with the upper arm bones (humerus) and collar bones (clavicle) but not with the ribs and spine. Shoulder blade (scapular) pain can be located over the large area of the upper back, though.

Scapula (Shoulder Blade) Position Image

Picture 1. Scapula location:
on both sides of the upper back, under the muscles

(free image use)

Scapula Anatomy

Scapula

Picture 2. The right scapula from the front and back side
(free image use)

The shoulder blade is a flat bone with three angles–the upper (superior), bottom (inferior) and lateral (glenoid) angle– and three borders–the superior, lateral (axillary) and medial (vertebral) border (Picture 3).

On the back side of the shoulder blade, at about two thirds of its height, a bony ridge called the shoulder blade spine runs diagonally upwards toward the lateral angle and ends as a bony hook–the acromion–, which makes a bony roof of the shoulder joint. The part of the shoulder blade above the spine is called the supraspinous fossa and the part below the spine is the infraspinous fossa. The other bony part, which sticks out from the frontal upper part of the shoulder blade, is called the coracoid.

The frontal surface of the scapula is called the subscapular fossa.

Scapula picture

Picture 3. Scapula anatomy diagram: parts of the right shoulder blade:
anterior, posterior and lateral aspect 
(free image use)

The upper side part of the shoulder blade is called the glenoid cavity, which makes a joint with the upper arm bone–the glenohumeral joint. The acromion makes a joint with a clavicle–the acromioclavicular joint (Picture 4).

Shoulder or Pectoral Girdle

Shoulder Pectoralis Girdle Joints Ligaments Image

Picture 4. Shoulder or pectoral girdle:
scapula, clavicle and related joints and ligaments
(an anterior–from the front–view)

(free image use)

Shoulder Blade Muscles

Shoulder blade muscles from behind picture

Picture 5. Muscles connected to the scapulas (shoulder blades)
(a posterior–from behind–view)

(free image use)

Muscles that Connect Scapula to SPINE

Trapezius

Trapezius is the biggest upper back muscle that lies between the scapula and the spine and between the scapula and the neck on both sides.

  • Origin: Back of the skull, 7th cervical to 12th thoracic spinal vertebra
    Insertion: Spine and acromion of the scapula, lateral third of clavicle
  • Function: Elevates, depresses, retracts (moves toward the spine) and upwardly rotates the scapula, bends the neck backwards
  • Picture 5, Reference [2,3]

Rhomboid major

  • Origin: 2nd to 5th thoracic spinal vertebra
  • Insertion: Lower two thirds of medial border of the scapula
  • Function: Retracts and elevates the medial border of the scapula, rotates lateral angle downwards
  • Picture 5, Reference: [3]

Rhomboid minor

  • Origin: 7th cervical to 1st thoracic spinal vertebra
  • Insertion: Upper third of medial border of the scapula
  • Function: Retracts and elevates medial border of the scapula, rotates lateral angle downwards
  • Picture 5, Reference: [3]

Levator scapulae

  • Origin: 1st to 4th cervical spinal vertebra
  • Insertion: Upper part of medial border of the scapula
  • Function: Elevates medial border of the scapula and rotates lateral angle downwards, bends neck to the side
  • Picture 5, Reference: [3]

Shoulder blade scapula muscles front image

Picture 6. Muscles connected to the scapulas (shoulder blades)
(an anterior–from the front–view)

(free image use)

Muscles that Connect Scapula to RIBS

Serratus anterior

  • Origin: anterior surfaces of first 8 or 9 ribs
  • Insertion: anterior surface of medial border of the scapula
  • Function: abducts (protracts) the scapula, upwardly rotates it while abducting the upper arm, stabilizes the scapula by holding it to chest wall
  • Picture 6, Reference: [3]

Pectoralis minor

  • Origin: Anterior surfaces of the 3rd, 4th and 5th rib
  • Insertion: Coracoid of scapulae
  • Function: Draws the scapula forward and downward, elevates ribs (during breathing in)
  • Picture 6, Reference: [3]

Muscles that Connect Scapula to ARM

Rotator cuff muscles (subscapularis, supraspinous, infraspinous and teres minor) embrace the shoulder joint.

Subscapularis

  • Origin: Front side (subscapular fossa) of the scapula
  • Insertion: Upper, medial part of the upper arm bone (lesser tubercle of humerus)
  • Function: Rotates the upper arm in shoulder medially (which results in backward rotation of the palm)
  • Picture 6, Reference: [4]

Supraspinatus

  • Origin: Supraspinous fossa of the scapula
  • Insertion: Superior aspect of greater tubercle of the upper arm bone
  • Function: Helps the deltoid muscle to initiate the abduction (sideways raise) of the arm at shoulder
  • Picture 5, Reference: [4]

Infraspinatus

  • Origin: Infraspinous fossa of the scapula
  • Insertion: Middle part of the greater tubercle of the upper arm bone
  • Function: Laterally rotates arm in the shoulder (which results in forward rotation of the palm); it also helps stabilize the shoulder by drawing the upper arm toward the scapula
  • Picture 5, Reference: [4]

Teres minor

  • Origin: Middle part of lateral border of the scapula
  • Insertion: Inferior aspect of greater tubercle of humerus
  • Functions: Laterally rotates and adducts (moves toward the body) the upper arm and helps stabilize the upper arm in the shoulder by drawing it toward the scapula
  • Picture 5, Reference: [4]

Teres major

  • Origin: Lower lateral border and inferior angle of the scapula
  • Insertion: Medial lip of the intertubercular (bicipital) groove of the anterior upper arm bone
  • Function: Adducts (moves toward the body) the arm in the shoulder
  • Picture 5, Reference: [4]

Deltoid (middle head)

  • Origin: Acromion and the spine of the scapula
  • Insertion: Deltoid tuberosity of the upper arm bone
  • Function: Abducts (raises sideways) the arm in the shoulder
  • Picture 5, Reference: [4]

Deltoid (posterior head)

  • Origin: Spine of the scapula
  • Insertion: Deltoid tuberosity of the upper arm bone
  • Function: Laterally rotates and extends backwards the arm in the shoulder
  • Picture 5, Reference: [4]

Coracobrachialis

  • Origin: Coracoid process of the scapula
  • Insertion: Mid-medial surface of the upper arm bone
  • Function: Flexes (forwards) the arm in the shoulder
  • Picture 6, Reference: [4]

Biceps brachii

  • Origin of the long head: Supraglenoid tubercle (lateral angle) of the scapula
  • Origin of the short head: Coracoid process of the scapula
  • Insertion: Tuberosity of the radius (the thinner bone in the forearm)
  • Function: Flexes the arm in the shoulder and elbow, supinates the forearm (which results in rotation of the palm upwards)
  • Picture 6, Reference: [4]

Triceps brachii (long head)

  • Origin: Infraglenoid tubercle (lateral angle) of the scapula
  • Insertion: Posteriour olecranon of the ulna (the thicker bone of the forearm)
  • Function: Extends the upper arm backwards at the shoulder
  • Picture 5, Reference: [4]

Muscles that Connect Scapula to Hyoid Bone

Omohyoid

  • Origin: Suprascapular ligament and superior border of the scapula
  • Insertion: Inferior border of hyoid bone
  • Function: Depresses hyoid bone and hence larynx
  • Reference: [5]

15 Responses to Scapula (Shoulder Blade)

  1. Calvin Hawkins says:

    right shoulder blade pain.. vey agitating … need relief… over sixty years old …

  2. Rob says:

    I need free advice from a good doctor help! I dislocated my shoulder and since it was reduced the bad side the scapula is no longer prominent. and it is quite raw when I get touched in the area. the doctor said it wasn’t broken based on the ER xrays which were side views so I don’t understand how he determines that, but he says its ust atrophy but how can a muscle atrophy instantly after a shoulder dislocation, I am not a quick thinker so I just agree with the doctors while I am at heir office. but I think the muscles have actually slipped off the scapula because it is really bony, while my good side is nice and meaty. also it hurts if I sit in chairs now my scapula. don’t understand why its flat. when I press my back against the wall and I raise my good arm both shoulder blades touch the wall but when I lift my bad arm that shoulder blade doesn’t stay flat against he wall. same thing trying to sleep I cannot raise my arm above my head because it won’t lay flat on the bed, I have to but a bunch of pillows under my arm and that is only comfortable for a few minutes. I was thinking my reduction at the ER WAS DONE IMPROPERLY but I don’t know since I asked for drugs to knock me out because I was in so much pain by the time the ER doctor could do anything 5 hours later. but somehow my scapula is not right anymore at least the muscle movements. Wish there is a way to manipulate he muscles back to their original position without surgery. is that possible?

    • Jan Modric says:

      Rob, it is possible you have a condition that affects your shoulder muscles or the nerves that supply those muscles. It is an orthopedist or neurologist who can help. It is possible that muscle atrophy was the cause rather than the result of shoulder dislocation.

  3. Paul W (PT) Timmons says:

    I am a 60 year old male who hasn’t been in the gym for 25 years. I am experiencing a sharp pain between my scapula and my spine ( closer to my scapula). Pain level is a solid 7. If I push on that area, it’s a solid 9. I do a lot of lifting at work and in my personal life. What do you think I did? HELP!

    • Jan Modric says:

      Paul, the common cause of such pain is muscle strain; it may be also a muscle rupture. I can’t exclude an injury f your spinal vertebra or nerves, so you may want to see a doctor. Avoid any lifting or carrying anything heavy.

  4. Charlotte Ereckson says:

    Three weeks ago I was out shopping carrying a heavy purse usually on the right shoulder. I felt a tightness start in the top of my spine/neck. By the time I reached home it felt like a catch had begun tightening up in the right shoulder. After three weeks it is extremely painful with little pain free hours. I have used ice and heat off and on. It helps but not for long. I have been taking 3 advils every 4 hours and sometimes it works. I just had a steroid shot for a herniated disc. So the exercise gig has been out for months. I’m in my sixties and need to know how to treat this or should I see the Orthopedic.

    • Jan Modric says:

      Charlotte, seeing an orthopedist is a good idea. The pain can be related to a herniated disc in the neck.

  5. wasswa william says:

    Dear Jan Modric

    Thanks for the good work on ehealthstar.com

    I kindly ask for permission to use Picture 3 (Scapula anatomy diagram: parts of the right shoulder blade:
    anterior, posterior and lateral aspect) from this website in my report.

    I just want to illustrate the different parts of the scapula as presented.

    Kind regards

    • Jan Modric says:

      Wasswa, yes you can use this image or any other image in this or any other article on ehealthstar.com you want. If you will put it on some website, I would be happy if you give a live link to the article.

  6. Karina Roldan says:

    I’m having pain in the area of my shoulder blade. It’s hard to move my arm. Hard to breathe. I have complete range of motion, with some pain of coarse but.I can still move my arms in a full circle form. It hurts to lay down on the side of the pain. And it’s hard to lay down and get up in bed. I have no received Amy severe impact Altho I have been.sleeping on.my arm a lot and cleaning. Is it broken of sprained? Fracture? Or did I pull a muscle or something. Any advice?

    • Jan Modric says:

      Karina, you did not tell how old are you. If you are older, even average physical work can result in a muscle tear. Muscle tears in the shoulder area less likely result in difficulty breathing, though. A lot of cleaning work can affect the muscle called serratus anterior and cause pain during breathing and arm movements. Such pain usually goes away on its own with some rest.

      Difficulty breathing with feeling ill coughing and/or fever can be from pleurisy.

  7. sohel says:

    Its a very good website

  8. Lex says:

    Great website. I am doing research on the shoulder itself, the bones that make it up, ligaments, tendons and muscles that are apart of it. I guess just the anatomy of the shoulder, its components, articulation, common injuries and their causes and fixes. If you have any recommended websites to look at for much needed information that would be wonderful. Thanks!

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