Lecture 3: Shoulder & Scapular Region Flashcards
What is the pectoral girdle?
Scapula + Clavicle
-Holds upper limb into place
“arm bone” in brachial region
Humerus
List the three joints of the shoulder
- Sternoclavicular
- Acromioclavicular
- Glenohumeral
T/F: The shoulder joint is both stable and very mobile
F: Very mobile, however it is not very stabile. (it is a trade off)
The sternoclavicular (SC) joint is a _____________ joint.
Synovial joint
The sternoclavicular (SC) joint is between what 2 structures?
Clavicle and Manubrium of sternum
Is the sternoclavicular (SC) joint a stable joint?
Yes - it rarely dislocates
T/F: The sternoclavicular (SC) joint is not reinforced by many ligaments
False; it is reinforced by many ligaments
What is the synovial joint between the acromion and lateral end of clavicle?
Acromioclavicular joint
The Acromioclavicular joint is a synovial joint. It is strengthened superiorly by the __________
Acromioclavicular ligament
Acromioclavicular joint - The lateral part of the clavicle attached to the coracoid process by the
coracoclavicular ligament
What is shoulder seperation?
Dislocation of the Acromioclavicular joint
What is the most mobile (and injured) joint in the body?
Glenohumeral Joint
The glenohumeral joint is a ___________________ synovial joint.
Ball-in-socket
The stability of the glenohumeral joint mainly comes from?
The rotator cuff muscles (as opposed to bones and ligaments)
Skin of the POSTERIOR shoulder is innervated by…
Posterior Rami
Skin of the LATERAL and ANTERIOR shoulder is innervated by…
Anterior rami
Shoulder muscles are innervated by…
Anterior Rami
What is the innervation of the trapezius?
CN XI - Accessory
What is the action of the trapezius?
Elevate, retract, & depress scapula
What is the innervation of the Latissimus Dorsi?
Thoracodorsal N
What is the action of the Latissimus Dorsi?
Extends and ADducts humerus
What is the innervation of the levator scapulae?
Dorsal scapular N
What is the function of the levator scapulae?
Elevate scapula
What is the innervation of rhomboid mjr and minor?
Dorsal scapular N
What is the function of rhomboid mjr and minor?
Elevate, retract, and inferiorly rotate scapula
Muscles that originate and insert on the upper limb are ________ muscles of the shoulder.
Intrinsic
The ______________ is the primary ABductor of the upper limb
Deltoid
What is the innervation of the deltoid?
Axillary N
The __________________ extends, ADducts, & medially rotates the arm.
Teres Major
What is the innervation of the Teres major?
Lower Subscapular N.
What are the rotator cuff muscles [4]?
1.) Subscapularis
2.) Supraspinatus
3.) Infraspinatus
4.) Teres Minor
What is the action of the subscapularis?
Medially rotate arm
What is the innervation of the subscapularis?
Subscapular nn.
What is the action of the supraspinatus?
ABducts arm
What is the innervation of the supraspinatus?
Suprascapular n.
What is the action of the infraspinatus?
ADducts & laterally rotates arm
What is the innervation of the infraspinatus?
Suprascapular n.
What is the action of the Teres Minor?
Adduct & Laterally rotates arm
What is the innervation of Teres Minor?
Axillary n.
What structures travels through the triangular space?
Circumflex scapular A.
What structures travel through the triceps hiatus?
Profunda brachii a. & Radial N.
What structures travel through the quadrangular space?
Posterior circumflex humeral a. & axillary n.
What are the boundaries of the triangular space?
Teres major & minor
What are the boundaries of the triceps hiatus?
Triceps brachii, humerus, & teres major
What are the boundaries of the quadrangular space?
Teres major & minor, triceps brachii, & humerus
What is the main blood supply to the upper limb?
Subclavian artery
The subclavian changes its name to ________ at the lateral boarder of the 1st rib
Axillary artery
The axillary artery changes its name to __________ at the inferior border of teres major
Brachial Artery
T/F: Deep veins have the same names as arteries in the upper limb.
True
Which superficial vein is on the thumb side?
Cephalic
What superficial vein is on the pinky side?
Basilic
Where is venipuncture done?
Median cubital vein