1. Shoulder Girdle/Joint Lab
Josh Adetula
Deborah Yang

2. From Which joint is the shoulder connected to the spinal column?
The shoulder is connected to the spinal column via the scapulothoracic joint.

3. Which of the following joints is NOT a part of the shoulder complex?
The Alatoaxial joint is not a part of the shoulder complex

4. Where is the insertion of the Pectoralis minor?
It is inserted at the coracoid process of the scapula.

5. Q: What is the function of the Levator Scapulae Muscle?
The Levator Scapulae’s Function is to elevate the scapula.

6. Flexion
Movement of humerus straight anteriorly from any point in the sagittal plane.

7. Extension
Movement of the humerus straight posteriorly from any point in the sagittal plane

8. Abduction
Upward lateral movement of the humerus in frontal plane out to the side, and away from the body.
Can be diagonal or horizontal

9. Adduction
Downward movement of the humerus in the frontal plane medially toward the body.
Can be diagonal or horizontal

10. Rotation
Lateral movment of the humerus in the tranverse plane along its long axis.
There are 2 types: Internal and External

11. Sternoclavicular Joint
Distal (also is medial) to the most lateral edge of the deltoid.

12. Q: Which Nerve innervates the rhomboid muscle?
The rhomboid muscle is innervated by the dorsal scapula nerve

13. From which cord does the musclocutaneous nerve originate?
The nerve originates from the lateral cord of the brachial plexus.

14. In which part of the scapula does the humeral head fit, to make the glenohumeral joint?
The humeral head fits into the glenoid cavity to make the glenohumeral joint.

15. Scapula Coracoid Process (A) Scapular Notch (J) Superior Margin (B)
Supraspinatus Fossa (L)
Superior Angle (K)
Scapular Spine (C)
Vertebral Margin (D)
Infraspinatus Fossa (H)
Inferior Angle (I)
Axillary Margin (E)
Glenoid Cavity Margin (F)
Acromion Process (G)

16. The Deltoid musle is…
…the main adductor of the shoulder joint.

17. If the long thoracic nerve gets injured, then which movement of the shoulder girdle will be affected?
Injury to the LTN would greatly affected abduction.

18. Subclavius Muscle can be strengthened by…
The subclavius muscle can be strengthened by active depression.

19. The origin of rhomboid muscle is the spineous process of…
Its origin is the spineous process of C7 to T5.

20. Left Scapula (seen in lateral view)
Coracoid Process
Glenoid Cavity
Scapular Spine
Acromion Process
Infraspinatus Fossa
Inferior Angle

21. Clavicle injury results….
When dealt a blow to the medial end of the clavicle, this will cause an AC separation (aka dislocated shoulder), which tears up the joint capsule.

22. Muscle Origin Insertion Action Innervations Pectoralis Minor
Anterior Surfaces of the 3rd to 5th ribs
Coracoid process of the scapula
Abduction, Depression, & Downward Rotation
Medial pectoral nerve (C8 & T1)
Serratus Anterior
Surface of the upper 9 ribs at the side of the chest
Anterior side of the medial scapula
Abduction & Upward Rotation
Long Thoracic Nerve (C5 –C7)
Trapezius – upper fibers
Base of skull, occ. Protuberance, and posterior ligaments of the neck
Posterior aspect of the lateral 3rd of the clavicle
Elevation & Extension or Rotation at the head of the neck
Spinal accessory nerve and branches of C3 & C4
Trapezius – middle fibers
Spinous process of C7-T3
Medial border of the acromion process and upper border of scapular spine
Elevation, Adduction, & Upward rotation
Trapezius – lower fibers
Spinous process of 4th-12th thoracic vertebrae
Triangular space at the base of the scapular spine
Adduction, Depression, & Upward rotation
Rhomboids
Spinous processes of C7-T5
Medial border of scapula, below scapula spine
Adduction, downward rotation, & Elevation
Dorsal Scapula Nerve (C5)
Levator Scapulae
Transverse processes of C1-C4
Medial border of scapula
Elevation
Dorsal Scapula Nerve (C5) and branches of C3 & C4

23. Muscle Origin Insertion Action Innervations Pectoralis major
Upper Fibers – medial half of front of clavicle
Lower Fibers- Anerior surface of first 6 ribs
Flat tendon 2 or 3 inches wide to lateral lip of IT groove of humerus
Rotation, Adduction, Flexion, Extension, & Abduction
Lateral Pectoral Nerve (C5, C6, C7)
Subscapularis
Entire Anterior surface of subscapular fossa
Lesser Tubercle of Humerus
Rotation (Internal)
Medial Pectoral Nerve (C8, T1)
Coracobrachialis
Coracoid process of scapula
Middle of medial border or humeral shaft
Adduction (Horizontal & Diagonal)
Upper and lower subscapular nerve (C5, C6)
Deltoid
Anterior - Anterior lateral C3
Middle – Acromion (lateral)
Posterior – Spine of Scapula (Inferior edge)
Deltoid Tuberosity on the lateral humerus
Abduction Flexion, Adduction
Axillary Nerve
(C5, C6)
Supraspinatus
Medial 2/3 of SSP Fossa
Superiorly on Greater Tubercle of humerus
Abduction
Suprascapula nerve (C5)
Latissimus Dorsi
At Lumbar Vertebrae to Lower 6 Thoracic Vertebrae, back of Sacrum, and Posterior crest of ilium
Medial side of IT groove of humerus, anterior to teres major insertion
Extension, Adduction, and Rotation (internal)
Thoracodorsal (C6, C7, C8)
Teres Major
Inferior 3rd of lateral border of scapula
Medial lip of IT groove of humerus, posterior to latissimus dorsi insertion
Extension, Adduction, and Internal Rotation
Lower subscapular nerve (C5, C6)
Infraspinatus
Medial aspect of infraspinatus fossa, just below spine of scapula
Posteriorly on greater tubercle of humerus
External rotation, Horizontal/Diagonal abduction,
Suprascapula nerve (C5, C6)
Teres Minor
Posteriorly on upper and middle aspect of lateral border of scapula
External rotation, Horizontal abduction, and diagonal adduction
Axillary Nerve (C5, C6)